High Precision, Low Noise
OPERATIONAL AMPLIFIERS
FEATURES
● LOW NOISE: 3nV/√Hz
● WIDE BANDWIDTH:
OPA227: 8MHz, 2.3V/µs
OPA228: 33MHz, 10V/µs
●SETTLING TIME: 5µs
(significant improvement over OP-27)
● HIGH CMRR: 138dB
● HIGH OPEN-LOOP GAIN: 160dB
● LOW INPUT BIAS CURRENT: 10nA max
● LOW OFFSET VOLTAGE: 75µV max
● WIDE SUPPLY RANGE: ±2.5V to ±18V
● OPA227 REPLACES OP-27, LT1007, MAX427
● OPA228 REPLACES OP-37, LT1037, MAX437
● SINGLE, DUAL, AND QUAD VERSIONS
APPLICATIONS
●DATA ACQUISITION
●TELECOM EQUIPMENT
●GEOPHYSICAL ANALYSIS
●VIBRATION ANALYSIS
●SPECTRAL ANALYSIS
●PROFESSIONAL AUDIO EQUIPMENT
●ACTIVE FILTERS
●POWER SUPPLY CONTROL
OPA4227
OPA227
OPA227
OPA2227
OPA4227
OPA2227
DESCRIPTION
The OPA227 and OPA228 series op amps combine low
noise and wide bandwidth with high precision to make them
the ideal choice for applications requiring both ac and preci-
sion dc performance.
The OPA227 is unity-gain stable and features high slew rate
(2.3V/µs) and wide bandwidth (8MHz). The OPA228 is opti-
mized for closed-loop gains of 5 or greater, and offers higher
speed with a slew rate of 10V/µs and a bandwidth of 33MHz.
The OPA227 and OPA228 series op amps are ideal for
professional audio equipment. In addition, low quiescent
current and low cost make them ideal for portable applica-
tions requiring high precision.
The OPA227 and OPA228 series op amps are pin-for-pin
replacements for the industry standard OP-27 and OP-37
with substantial improvements across the board. The dual
and quad versions are available for space savings and per-
channel cost reduction.
The OPA227, OPA228, OPA2227, and OPA2228 are
available in DIP-8 and SO-8 packages. The OPA4227 and
OPA4228 are available in DIP-14 and SO-14 packages
with standard pin configurations. Operation is specified
from –40°C to +85°C.
SPICE model available for OPA227 at www.ti.com
SBOS110A – MAY 1998 – REVISED JANUARY 2005
www.ti.com
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright © 1998-2005, Texas Instruments Incorporated
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
OPA227
OPA2227
OPA4227
OPA228
OPA2228
OPA4228
1
2
3
4
8
7
6
5
Trim
V+
Output
NC
Trim
–In
+In
V–
OPA227, OPA228
DIP-8, SO-8
NC = Not Connected
1
2
3
4
8
7
6
5
V+
Out B
–In B
+In B
Out A
–In A
+In A
V–
OPA2227, OPA2228
DIP-8, SO-8
A
B
1
2
3
4
5
6
7
14
13
12
11
10
9
8
Out D
–In D
+In D
V–
+In C
–In C
Out C
Out A
–In A
+In A
V+
+In B
–In B
Out B
OPA4227, OPA4228
DIP-14, SO-14
AD
BC
OPA227, 2227, 4227
OPA228, 2228, 4228
2SBOS110A
www.ti.com
SPECIFICATIONS: VS = ±5V to ±15V
OPA227 Series
At TA = +25°C, and RL = 10kΩ, unless otherwise noted.
Boldface limits apply over the specified temperature range, TA = –40°C to +85°C.
OPA227PA, UA
OPA227P, U OPA2227PA, UA
OPA2227P, U OPA4227PA, UA
PARAMETER CONDITION MIN TYP MAX MIN TYP MAX UNITS
OFFSET VOLTAGE
Input Offset Voltage VOS ±5±75 ±10 ±200 µV
OTA = –40°C to +85°Cver Temperature ±100 ±200 µV
vs Temperature dVOS/dT ±0.1 ±0.6 ±0.3 ±2µV/°C
vs Power Supply PSRR VS = ±2.5V to ±18V ±0.5 ±2✻✻µV/V
TA = –40°C to +85°C±2✻µV/V
vs Time 0.2 ✻µV/mo
Channel Separation (dual, quad) dc 0.2 ✻µV/V
f = 1kHz, RL = 5kΩ110 ✻dB
INPUT BIAS CURRENT
Input Bias Current IB±2.5 ±10 ✻✻nA
TA = –40°C to +85°C±10 ✻nA
Input Offset Current IOS ±2.5 ±10 ✻✻nA
TA = –40°C to +85°C±10 ✻nA
NOISE
Input Voltage Noise, f = 0.1Hz to 10Hz 90 ✻nVp-p
15 ✻nVrms
Input Voltage Noise Density, f = 10Hz en3.5 ✻nV/√Hz
f = 100Hz 3 ✻nV/√Hz
f = 1kHz 3 ✻nV/√Hz
Current Noise Density, f = 1kHz in0.4 ✻pA/√Hz
INPUT VOLTAGE RANGE
Common-Mode Voltage Range VCM (V–)+2 (V+)–2✻✻V
Common-Mode Rejection CMRR VCM = (V–)+2V to (V+)–2V 120 138 ✻✻ dB
TA = –40°C to +85°C 120 ✻dB
INPUT IMPEDANCE
Differential 107 || 12 ✻Ω || pF
Common-Mode VCM = (V–)+2V to (V+)–2V 109 || 3 ✻Ω || pF
OPEN-LOOP GAIN
Open-Loop Voltage Gain AOL
V
O
= (V–)+2V to (V+)–2V, R
L
= 10kΩ
132 160 ✻✻ dB
TA = –40°C to +85°C 132 ✻dB
VO = (V–)+3.5V to (V+)–3.5V, RL = 600Ω
132 160 ✻✻ dB
TA = –40°C to +85°C 132 ✻dB
FREQUENCY RESPONSE
Gain Bandwidth Product GBW 8 ✻MHz
Slew Rate SR 2.3 ✻V/µs
Settling Time: 0.1% G = 1, 10V Step, CL = 100pF 5 ✻µs
0.01% G = 1, 10V Step, CL = 100pF 5.6 ✻µs
Overload Recovery Time VIN • G = VS1.3 ✻µs
Total Harmonic Distortion + Noise THD+N f = 1kHz, G = 1, VO = 3.5Vrms 0.00005 ✻%
OUTPUT
Voltage Output RL = 10kΩ(V–)+2 (V+)–2✻✻V
TA = –40°C to +85°CRL = 10kΩ(V–)+2 (V+)–2 ✻✻V
RL = 600Ω(V–)+3.5 (V+)–3.5 ✻✻V
TA = –40°C to +85°CRL = 600Ω(V–)+3.5 (V+)–3.5 ✻✻V
Short-Circuit Current ISC ±45 ✻mA
Capacitive Load Drive CLOAD See Typical Curve ✻
POWER SUPPLY
Specified Voltage Range VS±5±15 ✻✻V
Operating Voltage Range ±2.5 ±18 ✻✻V
Quiescent Current (per amplifier) IQIO = 0 ±3.7 ±3.8 ✻✻mA
TA = –40°C to +85°CIO = 0 ±4.2 ✻mA
TEMPERATURE RANGE
Specified Range –40 +85 ✻✻°C
Operating Range –55 +125 ✻✻°C
Storage Range –65 +150 ✻✻°C
Thermal Resistance
θ
JA
SO-8 Surface Mount 150 ✻°C/W
DIP-8 100 ✻°C/W
DIP-14 80 ✻°C/W
SO-14 Surface Mount 100 ✻°C/W
✻ Specifications same as OPA227P, U.
OPA227, 2227, 4227
OPA228, 2228, 4228 3
SBOS110A www.ti.com
OPA228PA, UA
OPA228P, U OPA2228PA, UA
OPA2228P, U OPA4228PA, UA
PARAMETER CONDITION MIN TYP MAX MIN TYP MAX UNITS
OFFSET VOLTAGE
Input Offset Voltage VOS ±5±75 ±10 ±200 µV
OTA = –40°C to +85°Cver Temperature ±100 ±200 µV
vs Temperature dVOS/dT ±0.1 ±0.6 ±0.3 ±2µV/°C
vs Power Supply PSRR VS = ±2.5V to ±18V ±0.5 ±2✻✻µV/V
TA = –40°C to +85°C±2✻µV/V
vs Time 0.2 ✻µV/mo
Channel Separation (dual, quad) dc 0.2 ✻µV/V
f = 1kHz, RL = 5kΩ110 ✻dB
INPUT BIAS CURRENT
Input Bias Current IB±2.5 ±10 ✻✻nA
TA = –40°C to +85°C±10 ✻nA
Input Offset Current IOS ±2.5 ±10 ✻✻nA
TA = –40°C to +85°C±10 ✻nA
NOISE
Input Voltage Noise, f = 0.1Hz to 10Hz 90 ✻nVp-p
15 ✻nVrms
Input Voltage Noise Density, f = 10Hz en3.5 ✻nV/√Hz
f = 100Hz 3 ✻nV/√Hz
f = 1kHz 3 ✻nV/√Hz
Current Noise Density, f = 1kHz in0.4 ✻pA/√Hz
INPUT VOLTAGE RANGE
Common-Mode Voltage Range VCM (V–)+2 (V+)–2✻✻V
Common-Mode Rejection CMRR VCM = (V–)+2V to (V+)–2V 120 138 ✻✻ dB
TA = –40°C to +85°C 120 ✻dB
INPUT IMPEDANCE
Differential 107 || 12 ✻Ω || pF
Common-Mode VCM = (V–)+2V to (V+)–2V 109 || 3 ✻Ω || pF
OPEN-LOOP GAIN
Open-Loop Voltage Gain AOL
V
O
= (V–)+2V to (V+)–2V, R
L
= 10kΩ
132 160 ✻✻ dB
TA = –40°C to +85°C 132 ✻dB
VO = (V–)+3.5V to (V+)–3.5V, RL = 600Ω
132 160 ✻✻ dB
TA = –40°C to +85°C 132 ✻dB
FREQUENCY RESPONSE
Minimum Closed-Loop Gain 5 ✻V/V
Gain Bandwidth Product GBW 33 ✻MHz
Slew Rate SR 11 ✻V/µs
Settling Time: 0.1%
G = 5, 10V Step, CL = 100pF, CF =12pF
1.5 ✻µs
0.01%
G = 5, 10V Step, CL = 100pF, CF =12pF
2✻µs
Overload Recovery Time VIN • G = VS0.6 ✻µs
Total Harmonic Distortion + Noise THD+N f = 1kHz, G = 5, VO = 3.5Vrms 0.00005 ✻%
OUTPUT
Voltage Output RL = 10kΩ(V–)+2 (V+)–2✻✻V
TA = –40°C to +85°CRL = 10kΩ(V–)+2 (V+)–2 ✻✻V
RL = 600Ω(V–)+3.5 (V+)–3.5 ✻✻V
TA = –40°C to +85°CRL = 600Ω(V–)+3.5 (V+)–3.5 ✻✻V
Short-Circuit Current ISC ±45 ✻mA
Capacitive Load Drive CLOAD See Typical Curve ✻
POWER SUPPLY
Specified Voltage Range VS±5±15 ✻✻V
Operating Voltage Range ±2.5 ±18 ✻✻V
Quiescent Current (per amplifier) IQIO = 0 ±3.7 ±3.8 ✻✻mA
TA = –40°C to +85°CIO = 0 ±4.2 ✻mA
TEMPERATURE RANGE
Specified Range –40 +85 ✻✻°C
Operating Range –55 +125 ✻✻°C
Storage Range –65 +150 ✻✻°C
Thermal Resistance
θ
JA
SO-8 Surface Mount 150 ✻°C/W
DIP-8 100 ✻°C/W
DIP-14 80 ✻°C/W
SO-14 Surface Mount 100 ✻°C/W
✻ Specifications same as OPA228P, U.
SPECIFICATIONS: VS = ±5V to ±15V
OPA228 Series
At TA = +25°C, and RL = 10kΩ, unless otherwise noted.
Boldface limits apply over the specified temperature range, TA = –40°C to +85°C.
OPA227, 2227, 4227
OPA228, 2228, 4228
4SBOS110A
www.ti.com
ABSOLUTE MAXIMUM RATINGS(1)
Supply Voltage .................................................................................. ±18V
Signal Input Terminals, Voltage ........................(V–) –0.7V to (V+) +0.7V
Current ....................................................... 20mA
Output Short-Circuit(2) .............................................................. Continuous
Operating Temperature ..................................................–55°C to +125°C
Storage Temperature .....................................................–65°C to +150°C
Junction Temperature...................................................................... 150°C
Lead Temperature (soldering, 10s)................................................. 300°C
NOTE: (1) Stresses above these ratings may cause permanent damage.
Exposure to absolute maximum conditions for extended periods may degrade
device reliability. (2) Short-circuit to ground, one amplifier per package.
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Texas Instru-
ments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.
ESD damage can range from subtle performance degradation
to complete device failure. Precision integrated circuits may be
more susceptible to damage because very small parametric
changes could cause the device not to meet its published
specifications.
For the most current package and ordering information, see
the Package Option Addendum located at the end of this
datasheet, or refer to our web site at www.ti.com.
PACKAGE/ORDERING INFORMATION
OPA227, 2227, 4227
OPA228, 2228, 4228 5
SBOS110A www.ti.com
TYPICAL PERFORMANCE CURVES
At TA = +25°C, RL = 10kΩ, and VS = ±15V, unless otherwise noted.
0.01 0.10 1 10 100 1k 10k 100k 1M 10M 100M
180
160
140
120
100
80
60
40
20
0
–20
A
OL
(dB)
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
–200
Phase (°)
Frequency (Hz)
OPEN-LOOP GAIN/PHASE vs FREQUENCY
G
φ
OPA228
20 100 1k 10k 20k
0.01
0.001
0.0001
0.00001
THD+Noise (%)
Frequency (Hz)
TOTAL HARMONIC DISTORTION + NOISE
vs FREQUENCY
G = 1, R
L
= 10kΩ
V
OUT
= 3.5Vrms OPA227
20 100 1k 10k 50k
0.01
0.001
0.0001
0.00001
THD+Noise (%)
Frequency (Hz)
TOTAL HARMONIC DISTORTION + NOISE
vs FREQUENCY
G = 1, R
L
= 10kΩ
V
OUT
= 3.5Vrms OPA228
0.01 0.10 1 10 100 1k 10k 100k 1M 10M 100M
180
160
140
120
100
80
60
40
20
0
–20
A
OL
(dB)
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
–200
Phase (°)
Frequency (Hz)
OPEN-LOOP GAIN/PHASE vs FREQUENCY
G
OPA227
φ
10.1 10 100 1k 10k 100k 1M
140
120
100
80
60
40
-20
–0
PSRR, CMRR (dB)
Frequency (Hz)
POWER SUPPLY AND COMMON-MODE
REJECTION RATIO vs FREQUENCY
+CMRR
+PSRR
–PSRR
0.1 101 100 1k 10k
100k
10k
1k
100
10
1
Voltage Noise (nV/√Hz)
Current Noise (fA/√Hz)
Frequency (Hz)
INPUT VOLTAGE AND CURRENT NOISE
SPECTRAL DENSITY vs FREQUENCY
Current Noise
Voltage Noise
OPA227, 2227, 4227
OPA228, 2228, 4228
6SBOS110A
www.ti.com
TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C, RL =10kΩ, and VS = ±15V, unless otherwise noted.
OFFSET VOLTAGE PRODUCTION DISTRIBUTION
Percent of Amplifiers (%)
Offset Voltage (µV)
–150
–135
–120
–105
–90
–75
–60
–45
–30
–15
0
15
30
45
60
75
90
105
120
135
150
17.5
15.0
12.5
10.0
5.5
5.0
2.5
0
Typical distribution
of packaged units.
OFFSET VOLTAGE DRIFT PRODUCTION DISTRIBUTION
Percent of Amplifiers (%)
Offset Voltage Drift (µV)/°C
12
8
4
0
Typical distribution
of packaged units.
0 0.5 1.0 1.5
10
8
6
4
2
0
–2
–4
–6
–8
–10
Offset Voltage Change (µV)
0 100 150 300
Time from Power Supply Turn-On (s)
WARM-UP OFFSET VOLTAGE DRIFT
50 200 250
10 100 1k 10k 100k 1M
140
120
100
80
60
40
Channel Separation (dB)
Frequency (Hz)
CHANNEL SEPARATION vs FREQUENCY
Dual and quad devices. G = 1, all channels.
Quad measured Channel A to D, or B to C;
other combinations yield similiar or improved
rejection.
INPUT NOISE VOLTAGE vs TIME
1s/div
50nV/div
VOLTAGE NOISE DISTRIBUTION (10Hz)
Percent of Units (%)
Noise (nV/√Hz)
3.160 3.25 3.34 3.43 3.51 3.60 3.69 3.78
24
16
8
0
OPA227, 2227, 4227
OPA228, 2228, 4228 7
SBOS110A www.ti.com
TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C, RL = 10kΩ, and VS = ±15V, unless otherwise noted.
–60 –40 –20 0 20 40 60 80 100 120 140
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
Input Bias Current (nA)
Temperature (°C)
INPUT BIAS CURRENT vs TEMPERATURE
–75 –50 –25 0 25 50 75 100 125
60
50
40
30
20
10
0
Short-Circuit Current (mA)
Temperature (°C)
SHORT-CIRCUIT CURRENT vs TEMPERATURE
+ISC –ISC
QUIESCENT CURRENT vs TEMPERATURE
100 120 140
Temperature (°C)
–60 –40 –20 0 20 40 60 80
5.0
4.5
4.0
3.5
3.0
2.5
Quiescent Current (mA)
±10V
±5V
±2.5V
±18V
±15V
±12V
QUIESCENT CURRENT vs SUPPLY VOLTAGE
20
Supply Voltage (±V)
0 2 4 6 8 1012141618
3.8
3.6
3.4
3.2
3.0
2.8
Quiescent Current (mA)
–75 –50 –25 0 25 50 75 100 125
160
150
140
130
120
110
100
90
80
70
60
AOL, CMRR, PSRR (dB)
Temperature (°C)
AOL, CMRR, PSRR vs TEMPERATURE
CMRR
PSRR
AOL
OPA227
–75 –50 –25 0 25 50 75 100 125
160
150
140
130
120
110
100
90
80
70
60
A
OL
, CMRR, PSRR (dB)
Temperature (°C)
A
OL
, CMRR, PSRR vs TEMPERATURE
CMRR
PSRR
A
OL
OPA228
OPA227, 2227, 4227
OPA228, 2228, 4228
8SBOS110A
www.ti.com
TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C, RL = 10kΩ, and VS = ±15V, unless otherwise noted.
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
∆IB (nA)
0 5 10 15 20 25 30 35 40
Supply Voltage (V)
CHANGE IN INPUT BIAS CURRENT
vs POWER SUPPLY VOLTAGE
Curve shows normalized change in bias current
with respect to VS = ±10V. Typical IB may range
from –2nA to +2nA at VS = ±10V.
CHANGE IN INPUT BIAS CURRENT
vs COMMON-MODE VOLTAGE
15
Common-Mode Voltage (V)
–15 –10 –50 510
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
∆IB (nA)
VS = ±15V
VS = ±5V
Curve shows normalized change in bias current
with respect to VCM = 0V. Typical IB may range
from –2nA to +2nA at VCM = 0V.
OUTPUT VOLTAGE SWING vs OUTPUT CURRENT
15
14
13
12
11
10
–10
–11
–12
–13
–14
–15
V+
(V+) –1V
(V+) –2V
(V+) –3V
(V–) +3V
(V–) +2V
(V–) +1V
V–
0 102030405060
Output Current (mA)
Output Voltage Swing (V)
–55°C
–40°C
–55°C
85°C
25°C
85°C
25°C–40°C
125°C
125°C
100
10
1
Settling Time (µs)
±1±10 ±100
Gain (V/V)
SETTLING TIME vs CLOSED-LOOP GAIN
0.01%
OPA227
0.1%
VS = ±15V, 10V Step
CL = 1500pF
RL = 2kΩ
0.01%
OPA228
0.1%
SLEW RATE vs TEMPERATURE
125
Temperature (°C)
–75 –50 –25 0 25 50 75 100
3.0
2.5
2.0
1.5
1.0
0.5
0
Slew Rate (µV/V)
Negative Slew Rate
RLOAD = 2kΩ
CLOAD = 100pF
Positive Slew Rate
OPA227
SLEW RATE vs TEMPERATURE
125
Temperature (°C)
–75 –50 –25 0 25 50 75 100
12
10
8
6
4
2
0
Slew Rate (µV/V)
RLOAD = 2kΩ
CLOAD = 100pF
OPA228
OPA227, 2227, 4227
OPA228, 2228, 4228 9
SBOS110A www.ti.com
TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C, RL = 10kΩ, and VS = ±15V, unless otherwise noted.
LARGE-SIGNAL STEP RESPONSE
G = –1, CL = 1500pF
5µs/div
2V/div
SMALL-SIGNAL STEP RESPONSE
G = +1, CL = 1000pF
400ns/div
25mV/div
SMALL-SIGNAL STEP RESPONSE
G = +1, CL = 5pF
400ns/div
25mV/div
SMALL-SIGNAL OVERSHOOT
vs LOAD CAPACITANCE
1k100101 10k 100k
Load Capacitance (pF)
70
60
50
40
30
20
10
0
Overshoot (%)
Gain = –10
Gain = +10
OPA227
Gain = +1 Gain = –1
OPA227 OPA227
OPA227
MAXIMUM OUTPUT VOLTAGE vs FREQUENCY
10M
Frequency (Hz)
1k 10k 100k 1M
30
25
20
15
10
5
0
Output Voltage (Vp-p)
V
S
= ±15V
OPA227
V
S
= ±5V
OPA227, 2227, 4227
OPA228, 2228, 4228
10 SBOS110A
www.ti.com
TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C, RL = 10kΩ, and VS = ±15V, unless otherwise noted.
SMALL-SIGNAL STEP RESPONSE
G = +10, CL = 1000pF, RL = 1.8kΩ
500ns/div
200mV/div
SMALL-SIGNAL STEP RESPONSE
G = +10, CL = 5pF, RL = 1.8kΩ
500ns/div
200mV/div
LARGE-SIGNAL STEP RESPONSE
G = –10, CL = 100pF
2µs/div
5V/div
SMALL-SIGNAL OVERSHOOT
vs LOAD CAPACITANCE
1k100101 100k10k
Load Capacitance (pF)
70
60
50
40
30
20
10
0
Overshoot (%)
G = –100
G = +100
OPA228
G = ±10
OPA228 OPA228
OPA228
MAXIMUM OUTPUT VOLTAGE vs FREQUENCY
1M 10M
Frequency (Hz)
1k 10k 100k
30
25
20
15
10
5
0
Output Voltage (Vp-p)
V
S
= ±15V
V
S
= ±5V
OPA228
OPA227, 2227, 4227
OPA228, 2228, 4228 11
SBOS110A www.ti.com
FIGURE 1. OPA227 Offset Voltage Trim Circuit.
APPLICATIONS INFORMATION
The OPA227 and OPA228 series are precision op amps with
very low noise. The OPA227 series is unity-gain stable with
a slew rate of 2.3V/µs and 8MHz bandwidth. The OPA228
series is optimized for higher-speed applications with gains
of 5 or greater, featuring a slew rate of 10V/µs and 33MHz
bandwidth. Applications with noisy or high impedance
power supplies may require decoupling capacitors close to
the device pins. In most cases, 0.1µF capacitors are ad-
equate.
OFFSET VOLTAGE AND DRIFT
The OPA227 and OPA228 series have very low offset
voltage and drift. To achieve highest dc precision, circuit
layout and mechanical conditions should be optimized.
Connections of dissimilar metals can generate thermal po-
tentials at the op amp inputs which can degrade the offset
voltage and drift. These thermocouple effects can exceed
the inherent drift of the amplifier and ultimately degrade its
performance. The thermal potentials can be made to cancel
by assuring that they are equal at both input terminals. In
addition:
• Keep thermal mass of the connections made to the two
input terminals similar.
• Locate heat sources as far as possible from the critical
input circuitry.
• Shield op amp and input circuitry from air currents such
as those created by cooling fans.
OPERATING VOLTAGE
OPA227 and OPA228 series op amps operate from ±2.5V to
±18V supplies with excellent performance. Unlike most op
amps which are specified at only one supply voltage, the
OPA227 series is specified for real-world applications; a
single set of specifications applies over the ±5V to ±15V
supply range. Specifications are assured for applications
between ±5V and ±15V power supplies. Some applications
do not require equal positive and negative output voltage
swing. Power supply voltages do not need to be equal. The
OPA227 and OPA228 series can operate with as little as 5V
between the supplies and with up to 36V between the
supplies. For example, the positive supply could be set to
25V with the negative supply at –5V or vice-versa. In
addition, key parameters are assured over the specified
temperature range, –40°C to +85°C. Parameters which vary
significantly with operating voltage or temperature are shown
in the Typical Performance Curves.
OFFSET VOLTAGE ADJUSTMENT
The OPA227 and OPA228 series are laser-trimmed for
very low offset and drift so most applications will not
require external adjustment. However, the OPA227 and
OPA228 (single versions) provide offset voltage trim con-
nections on pins 1 and 8. Offset voltage can be adjusted by
connecting a potentiometer as shown in Figure 1. This
adjustment should be used only to null the offset of the op
amp. This adjustment should not be used to compensate for
offsets created elsewhere in the system since this can
introduce additional temperature drift.
INPUT PROTECTION
Back-to-back diodes (see Figure 2) are used for input protec-
tion on the OPA227 and OPA228. Exceeding the turn-on
threshold of these diodes, as in a pulse condition, can cause
current to flow through the input protection diodes due to the
amplifier’ s finite slew rate. W ithout external current-limiting
resistors, the input devices can be destroyed. Sources of high
input current can cause subtle damage to the amplifier.
Although the unit may still be functional, important param-
eters such as input offset voltage, drift, and noise may shift.
FIGURE 2. Pulsed Operation.
When using the OPA227 as a unity-gain buffer (follower), the
input current should be limited to 20mA. This can be accom-
plished by inserting a feedback resistor or a resistor in series
with the source. Sufficient resistor size can be calculated:
RX = VS/20mA – RSOURCE
where RX is either in series with the source or inserted in
the feedback path. For example, for a 10V pulse (VS =
10V), total loop resistance must be 500Ω. If the source
impedance is large enough to sufficiently limit the current
on its own, no additional resistors are needed. The size of
any external resistors must be carefully chosen since they
will increase noise. See the Noise Performance section of
this data sheet for further information on noise calcula-
tion. Figure 2 shows an example implementing a current-
limiting feedback resistor.
OPA227
20kΩ
0.1µF
0.1µF
21
7
8
6
3
4
V+
V–
Trim range exceeds
offset voltage specification
OPA227 and OPA228 single op amps only.
Use offset adjust pins only to
null offset voltage of op amp.
See text.
OPA227 Output
RF
500Ω
Input
–
+
OPA227, 2227, 4227
OPA228, 2228, 4228
12 SBOS110A
www.ti.com
INPUT BIAS CURRENT CANCELLATION
The input bias current of the OPA227 and OPA228 series is
internally compensated with an equal and opposite cancella-
tion current. The resulting input bias current is the difference
between with input bias current and the cancellation current.
The residual input bias current can be positive or negative.
When the bias current is cancelled in this manner, the input
bias current and input offset current are approximately equal.
A resistor added to cancel the effect of the input bias current
(as shown in Figure 3) may actually increase offset and noise
and is therefore not recommended.
Design of low noise op amp circuits requires careful
consideration of a variety of possible noise contributors:
noise from the signal source, noise generated in the op
amp, and noise from the feedback network resistors. The
total noise of the circuit is the root-sum-square combina-
tion of all noise components.
The resistive portion of the source impedance produces
thermal noise proportional to the square root of the
resistance. This function is shown plotted in Figure 4.
Since the source impedance is usually fixed, select the op
amp and the feedback resistors to minimize their contri-
bution to the total noise.
Figure 4 shows total noise for varying source imped-
ances with the op amp in a unity-gain configuration (no
feedback resistor network and therefore no additional
noise contributions). The operational amplifier itself con-
tributes both a voltage noise component and a current
FIGURE 3. Input Bias Current Cancellation. FIGURE 4. Noise Performance of the OPA227 in Unity-
Gain Buffer Configuration.
NOISE PERFORMANCE
Figure 4 shows total circuit noise for varying source imped-
ances with the op amp in a unity-gain configuration (no
feedback resistor network, therefore no additional noise con-
tributions). Two different op amps are shown with total circuit
noise calculated. The OPA227 has very low voltage noise,
making it ideal for low source impedances (less than 20kΩ).
A similar precision op amp, the OP A277, has somewhat higher
voltage noise but lower current noise. It provides excellent
noise performance at moderate source impedance (10kΩ to
100kΩ). Above 100kΩ, a FET-input op amp such as the
OPA132 (very low current noise) may provide improved
performance. The equation is shown for the calculation of the
total circuit noise. Note that en = voltage noise, in = current
noise, RS = source impedance, k = Boltzmann’s constant =
1.38 • 10–23 J/K and T is temperature in K. For more details on
calculating noise, see the insert titled “Basic Noise Calcula-
tions.”
noise component. The voltage noise is commonly mod-
eled as a time-varying component of the offset voltage.
The current noise is modeled as the time-varying compo-
nent of the input bias current and reacts with the source
resistance to create a voltage component of noise. Conse-
quently, the lowest noise op amp for a given application
depends on the source impedance. For low source imped-
ance, current noise is negligible and voltage noise gener-
ally dominates. For high source impedance, current noise
may dominate.
Figure 5 shows both inverting and noninverting op amp
circuit configurations with gain. In circuit configurations
with gain, the feedback network resistors also contribute
noise. The current noise of the op amp reacts with the
feedback resistors to create additional noise components.
The feedback resistor values can generally be chosen to
make these noise sources negligible. The equations for
total noise are shown for both configurations.
BASIC NOISE CALCULATIONS
Op Amp
R
1
R
2
R
B
= R
2
|| R
1
External Cancellation Resistor
Not recommended
for OPA227
Conventional Op Amp Configuration
Recommended OPA227 Configuration
OPA227
R
1
R
2
No cancellation resistor.
See text.
VOLTAGE NOISE SPECTRAL DENSITY
vs SOURCE RESISTANCE
100k 1M
Source Resistance, R
S
(Ω)
100 1k 10k
1.00+03
1.00E+02
1.00E+01
1.00E+00
Votlage Noise Spectral Density, E
0
Typical at 1k (V/√Hz)
OPA227
OPA277
Resistor Noise
Resistor Noise
OPA277
OPA227
R
S
E
O
E
O
2
= e
n
2
+ (i
n
R
S
)
2
+ 4kTR
S
OPA227, 2227, 4227
OPA228, 2228, 4228 13
SBOS110A www.ti.com
FIGURE 5. Noise Calculation in Gain Configurations.
Where eS = √4kTRS • = thermal noise of RS
e1 = √4kTR1 • = thermal noise of R1
e2 = √4kTR2 = thermal noise of R2
1
2
1
+
R
R
Noise at the output:
R
R
2
1
ER
ReeeiReiR R
R
On nSnS
22
1
22122222222
1
2
11=+
+++
()
++
()
+
Where eS = √4kTRS • = thermal noise of RS
e1 = √4kTR1 • = thermal noise of R1
e2 = √4kTR2= thermal noise of R2
Noise at the output:
R
RR
S
2
1+
R
RR
S
2
1
+
ER
RR eeeiRe
OSnnS
22
1
221222222
1=+ +
+++
()
+
R
1
R
2
E
O
R
1
R
2
E
O
R
S
V
S
R
S
V
S
Noise in Noninverting Gain Configuration
Noise in Inverting Gain Configuration
For the OPA227 and OPA228 series op amps at 1kHz, en = 3nV/√Hz and in = 0.4pA/√Hz.
OPA227, 2227, 4227
OPA228, 2228, 4228
14 SBOS110A
www.ti.com
Figure 6 shows the 0.1Hz 10Hz bandpass filter used to test
the noise of the OPA227 and OPA228. The filter circuit was
designed using Texas Instruments’ FilterPro software (avail-
able at www.ti.com). Figure 7 shows the configuration of
the OPA227 and OPA228 for noise testing.
FIGURE 6. 0.1Hz to 10Hz Bandpass Filter Used to Test Wideband Noise of the OPA227 and OPA228 Series.
FIGURE 7. Noise Test Circuit.
USING THE OPA228 IN LOW GAINS
The OPA228 family is intended for applications with signal
gains of 5 or greater, but it is possible to take advantage of
their high speed in lower gains. Without external compen-
sation, the OPA228 has sufficient phase mar gin to maintain
stability in unity gain with purely resistive loads. However,
the addition of load capacitance can reduce the phase
margin and destabilize the op amp.
A variety of compensation techniques have been evaluated
specifically for use with the OPA228. The recommended
configuration consists of an additional capacitor (CF) in
parallel with the feedback resistance, as shown in Figures
8 and 11. This feedback capacitor serves two purposes in
compensating the circuit. The op amp’s input capacitance
and the feedback resistors interact to cause phase shift that
can result in instability. CF compensates the input capaci-
tance, minimizing peaking. Additionally, at high frequen-
cies, the closed-loop gain of the amplifier is strongly
influenced by the ratio of the input capacitance and the
feedback capacitor. Thus, CF can be selected to yield good
stability while maintaining high speed.
R
4
9.09kΩ
R
3
1kΩ
R
7
97.6kΩ
R
6
40.2kΩ
C
2
1µF
C
1
1µFC
3
0.47µF
C
4
22nF
R
2
2MΩR
8
402kΩ
R
5
634kΩ
Input from
Device
Under
Test
R
1
2MΩ
(OPA227)
U1
(OPA227)
U2 6
2
3
R
10
226kΩ
R
9
178kΩ
C
5
0.47µF
C
6
10nF
R
11
178kΩ
(OPA227)
U3 6V
OUT
2
3
100kΩ
VOUT
6
2
3OPA227
22pF
10Ω
Device
Under
Test
OPA227, 2227, 4227
OPA228, 2228, 4228 15
SBOS110A www.ti.com
Without external compensation, the noise specification of
the OPA228 is the same as that for the OPA227 in gains of
5 or greater. With the additional external compensation, the
output noise of the of the OPA228 will be higher. The
amount of noise increase is directly related to the increase
in high frequency closed-loop gain established by the CIN/
CF ratio.
Figures 8 and 11 show the recommended circuit for gains
of +2 and –2, respectively. The figures suggest approximate
FIGURE 8. Compensation of the OPA228 for G =+2.
FIGURE 9. Large-Signal Step Response, G = +2, CLOAD =
100pF, Input Signal = 5Vp-p.
FIGURE 10. Small-Signal Step Response, G = +2, CLOAD =
100pF, Input Signal = 50mVp-p.
400ns/div
5mV/div
values for CF. Because compensation is highly dependent
on circuit design, board layout, and load conditions, CF
should be optimized experimentally for best results. Fig-
ures 9 and 10 show the large- and small-signal step re-
sponses for the G = +2 configuration with 100pF load
capacitance. Figures 12 and 13 show the large- and small-
signal step responses for the G = –2 configuration with
100pF load capacitance.
200ns/div
25mV/div
FIGURE 11. Compensation for OPA228 for G = –2.
FIGURE 12. Large-Signal Step Response, G = –2, CLOAD =
100pF, Input Signal = 5Vp-p.
400ns/div
5mV/div
200ns/div
25mV/div
FIGURE 13. Small-Signal Step Response, G = –2, CLOAD =
100pF, Input Signal = 50mVp-p.
2kΩ
OPA228
22pF
2kΩ
100pF
2kΩ
1kΩ2kΩ
15pF
OPA228
2kΩ100pF
OPA228
OPA228
OPA228 OPA228
OPA227, 2227, 4227
OPA228, 2228, 4228
16 SBOS110A
www.ti.com
FIGURE 15. Long-Wavelength Infrared Detector Amplifier. FIGURE 16. High Performance Synchronous Demodulator.
VOUT
VIN
OPA227
68nF 10nF
33nF
330pF
2.2nF
OPA227
1.43kΩ1.91kΩ
2.21kΩ
1.43kΩ
1.1kΩ
1.65kΩ1.1kΩ
fN = 13.86kHz
Q = 1.186
fN = 20.33kHz f = 7.2kHz
Q = 4.519
dc Gain = 1
Output
NOTE: Use metal film resistors
and plastic film capacitor. Circuit
must be well shielded to achieve
low noise.
Responsivity ≈ 2.5 x 104V/W
Output Noise ≈ 30µVrms, 0.1Hz to 10Hz
Dexter 1M
Thermopile
Detector
100Ω100kΩ
OPA227
2
36
0.1µF
Output
4.99kΩ
D2
D1
DG188
TTL
In
S1S2
9.76kΩ
500ΩBalance
Trim
OPA227
2
3
1
8
6
20pF
10kΩ
1kΩ
4.75kΩ
Offset
Trim
4.75kΩ
+V
CC
Input
TTL INPUT
“1”
“0”
GAIN
+1
–1
FIGURE 14. Three-Pole, 20kHz Low Pass, 0.5dB Chebyshev Filter.
OPA227, 2227, 4227
OPA228, 2228, 4228 17
SBOS110A www.ti.com
FIGURE 17. Headphone Amplifier.
FIGURE 18. Three-Band ActiveTone Control (bass, midrange and treble).
200Ω
200Ω
1kΩ
1kΩ
1/2
OPA2227
1/2
OPA2227
–15V
0.1µF
0.1µF
+15V
Audio
In
This application uses two op amps
in parallel for higher output current drive.
To
Headphone
R
5
50kΩ
R
4
2.7kΩ
V
IN
V
OUT
R
6
2.7kΩ
C
1
940pF
C
2
0.0047µF
C
3
680pF
CW
CW
R
2
50kΩ
R
1
7.5kΩR
3
7.5kΩ
R
10
100kΩ
R
8
50kΩ
R
7
7.5kΩR
9
7.5kΩR
11
100kΩ
CW
Bass Tone Control
Midrange Tone Control
Treble Tone Control
13
6
2
3
2
13
2
13
2
OPA227
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OPA2227P ACTIVE PDIP P 8 50 Green (RoHS
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& no Sb/Br) CU NIPDAU N / A for Pkg Type Add to cart
OPA2227U ACTIVE SOIC D 8 75 Green (RoHS
& no Sb/Br) CU NIPDAU Level-3-260C-168 HR Add to cart
OPA2227U/2K5 ACTIVE SOIC D 8 2500 Green (RoHS
& no Sb/Br) CU NIPDAU Level-3-260C-168 HR Add to cart
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& no Sb/Br) CU NIPDAU Level-3-260C-168 HR Add to cart
OPA2227UA ACTIVE SOIC D 8 75 Green (RoHS
& no Sb/Br) CU NIPDAU Level-3-260C-168 HR Add to cart
OPA2227UA/2K5 ACTIVE SOIC D 8 2500 Green (RoHS
& no Sb/Br) CU NIPDAU Level-3-260C-168 HR Add to cart
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& no Sb/Br) CU NIPDAU Level-3-260C-168 HR Add to cart
OPA2227UAE4 ACTIVE SOIC D 8 75 Green (RoHS
& no Sb/Br) CU NIPDAU Level-3-260C-168 HR Add to cart
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& no Sb/Br) CU NIPDAU Level-3-260C-168 HR Add to cart
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& no Sb/Br) CU NIPDAU Level-3-260C-168 HR Add to cart
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& no Sb/Br) CU NIPDAU Level-3-260C-168 HR Add to cart
OPA2228P ACTIVE PDIP P 8 50 Green (RoHS
& no Sb/Br) CU NIPDAU N / A for Pkg Type Add to cart
OPA2228PA ACTIVE PDIP P 8 50 Green (RoHS
& no Sb/Br) CU NIPDAU N / A for Pkg Type Add to cart
OPA2228PAG4 ACTIVE PDIP P 8 50 Green (RoHS
& no Sb/Br) CU NIPDAU N / A for Pkg Type Add to cart
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OPA2228U ACTIVE SOIC D 8 75 Green (RoHS
& no Sb/Br) CU NIPDAU Level-3-260C-168 HR Add to cart
OPA2228U/2K5 ACTIVE SOIC D 8 2500 Green (RoHS
& no Sb/Br) CU NIPDAU Level-3-260C-168 HR Add to cart
OPA2228U/2K5E4 ACTIVE SOIC D 8 2500 Green (RoHS
& no Sb/Br) CU NIPDAU Level-3-260C-168 HR Add to cart
OPA2228UA ACTIVE SOIC D 8 75 Green (RoHS
& no Sb/Br) CU NIPDAU Level-3-260C-168 HR Add to cart
OPA2228UA/2K5 ACTIVE SOIC D 8 2500 Green (RoHS
& no Sb/Br) CU NIPDAU Level-3-260C-168 HR Add to cart
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& no Sb/Br) CU NIPDAU Level-3-260C-168 HR Add to cart
OPA2228UAE4 ACTIVE SOIC D 8 75 Green (RoHS
& no Sb/Br) CU NIPDAU Level-3-260C-168 HR Add to cart
OPA2228UE4 ACTIVE SOIC D 8 75 Green (RoHS
& no Sb/Br) CU NIPDAU Level-3-260C-168 HR Add to cart
OPA227P ACTIVE PDIP P 8 50 Green (RoHS
& no Sb/Br) CU NIPDAU N / A for Pkg Type Add to cart
OPA227PA ACTIVE PDIP P 8 50 Green (RoHS
& no Sb/Br) CU NIPDAU N / A for Pkg Type Add to cart
OPA227PAG4 ACTIVE PDIP P 8 50 Green (RoHS
& no Sb/Br) CU NIPDAU N / A for Pkg Type Add to cart
OPA227PG4 ACTIVE PDIP P 8 50 Green (RoHS
& no Sb/Br) CU NIPDAU N / A for Pkg Type Add to cart
OPA227U ACTIVE SOIC D 8 75 Green (RoHS
& no Sb/Br) CU NIPDAU Level-3-260C-168 HR Add to cart
OPA227U/2K5 ACTIVE SOIC D 8 2500 Green (RoHS
& no Sb/Br) CU NIPDAU Level-3-260C-168 HR Add to cart
OPA227U/2K5E4 ACTIVE SOIC D 8 2500 Green (RoHS
& no Sb/Br) CU NIPDAU Level-3-260C-168 HR Add to cart
OPA227UA ACTIVE SOIC D 8 75 Green (RoHS
& no Sb/Br) CU NIPDAU Level-3-260C-168 HR Add to cart
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& no Sb/Br) CU NIPDAU Level-3-260C-168 HR Add to cart
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& no Sb/Br) CU NIPDAU Level-3-260C-168 HR Add to cart
OPA227UAG4 ACTIVE SOIC D 8 75 Green (RoHS
& no Sb/Br) CU NIPDAU Level-3-260C-168 HR Add to cart
OPA227UE4 ACTIVE SOIC D 8 75 Green (RoHS
& no Sb/Br) CU NIPDAU Level-3-260C-168 HR Add to cart
OPA228P ACTIVE PDIP P 8 50 Green (RoHS
& no Sb/Br) CU NIPDAU N / A for Pkg Type Add to cart
OPA228PA ACTIVE PDIP P 8 50 Green (RoHS
& no Sb/Br) CU NIPDAU N / A for Pkg Type Add to cart
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& no Sb/Br) CU NIPDAU N / A for Pkg Type Add to cart
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& no Sb/Br) CU NIPDAU N / A for Pkg Type Add to cart
OPA228U ACTIVE SOIC D 8 75 Green (RoHS
& no Sb/Br) CU NIPDAU Level-3-260C-168 HR Add to cart
OPA228UA ACTIVE SOIC D 8 75 Green (RoHS
& no Sb/Br) CU NIPDAU Level-3-260C-168 HR Add to cart
OPA228UA/2K5 ACTIVE SOIC D 8 2500 Green (RoHS
& no Sb/Br) CU NIPDAU Level-3-260C-168 HR Add to cart
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& no Sb/Br) CU NIPDAU Level-3-260C-168 HR Add to cart
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& no Sb/Br) CU NIPDAU Level-3-260C-168 HR Add to cart
OPA228UG4 ACTIVE SOIC D 8 75 Green (RoHS
& no Sb/Br) CU NIPDAU Level-3-260C-168 HR Add to cart
OPA4227PA ACTIVE PDIP N 14 25 Green (RoHS
& no Sb/Br) CU NIPDAU N / A for Pkg Type Add to cart
OPA4227PAG4 ACTIVE PDIP N 14 25 Green (RoHS
& no Sb/Br) CU NIPDAU N / A for Pkg Type Add to cart
OPA4227UA ACTIVE SOIC D 14 50 Green (RoHS
& no Sb/Br) CU NIPDAU Level-3-260C-168 HR Add to cart
OPA4227UA/2K5 ACTIVE SOIC D 14 2500 Green (RoHS
& no Sb/Br) CU NIPDAU Level-3-260C-168 HR Add to cart
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& no Sb/Br) CU NIPDAU N / A for Pkg Type Add to cart
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& no Sb/Br) CU NIPDAU Level-3-260C-168 HR Add to cart
OPA4228UA/2K5 ACTIVE SOIC D 14 2500 Green (RoHS
& no Sb/Br) CU NIPDAU Level-3-260C-168 HR Add to cart
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& no Sb/Br) CU NIPDAU Level-3-260C-168 HR Add to cart
OPA4228UAE4 ACTIVE SOIC D 14 50 Green (RoHS
& no Sb/Br) CU NIPDAU Level-3-260C-168 HR Add to cart
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
PACKAGE OPTION ADDENDUM
www.ti.com 23-Dec-2011
Addendum-Page 5
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device Package
Type Package
Drawing Pins SPQ Reel
Diameter
(mm)
Reel
Width
W1 (mm)
A0
(mm) B0
(mm) K0
(mm) P1
(mm) W
(mm) Pin1
Quadrant
OPA2227U/2K5 SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1
OPA2227UA/2K5 SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1
OPA2228U/2K5 SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1
OPA2228UA/2K5 SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1
OPA227U/2K5 SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1
OPA227UA/2K5 SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1
OPA228UA/2K5 SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1
OPA4227UA/2K5 SOIC D 14 2500 330.0 16.4 6.5 9.0 2.1 8.0 16.0 Q1
OPA4228UA/2K5 SOIC D 14 2500 330.0 16.4 6.5 9.0 2.1 8.0 16.0 Q1
PACKAGE MATERIALS INFORMATION
www.ti.com 14-Jul-2012
Pack Materials-Page 1
*All dimensions are nominal
Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
OPA2227U/2K5 SOIC D 8 2500 367.0 367.0 35.0
OPA2227UA/2K5 SOIC D 8 2500 367.0 367.0 35.0
OPA2228U/2K5 SOIC D 8 2500 367.0 367.0 35.0
OPA2228UA/2K5 SOIC D 8 2500 367.0 367.0 35.0
OPA227U/2K5 SOIC D 8 2500 367.0 367.0 35.0
OPA227UA/2K5 SOIC D 8 2500 367.0 367.0 35.0
OPA228UA/2K5 SOIC D 8 2500 367.0 367.0 35.0
OPA4227UA/2K5 SOIC D 14 2500 367.0 367.0 38.0
OPA4228UA/2K5 SOIC D 14 2500 367.0 367.0 38.0
PACKAGE MATERIALS INFORMATION
www.ti.com 14-Jul-2012
Pack Materials-Page 2
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