LT2178/LT2179
1
21789fc
TYPICAL APPLICATION
DESCRIPTION
17µA Max, Dual and Quad,
Single Supply, Precision Op Amps
The LT
®
2178 is a micropower dual op amp in a surface
mount standard 8-pin confi guration, the LT2179 is a
micropower quad op amp offered in a surface mount
14-pin package. Both devices are optimized for single
supply operation at 5V. Specifi cations are also provided
at ±15V supply.
The extremely low supply current is combined with true
precision specifi cations: offset voltage is 30µV and offset
current is 50pA. Both offset parameters have low drift with
temperature. The 1.5pAP-P current noise and picoampere
offset current permit the use the megohm level source
resistors without introducing serious errors. Voltage
noise, at 0.9µVP-P, is remarkably low considering the low
supply current.
The LT2178/LT2179 can be operated from a single supply
(as low as one lithium-cell or two NiCd batteries). The input
range goes below ground. The all-NPN output stage swings
to within a few millivolts of ground while sinking current.
No power consuming pull down resistors are needed.
For surface mount applications where three times higher
supply current is acceptable, the micropower LT1077
single, LT2078 dual and LT2079 quad are recommended.
The LT1077/LT2078/LT2079 have signifi cantly higher
bandwidth, slew rate, lower voltage noise and better output
drive capability. For applications requiring DIP packages
refer to the LT1178/LT1179.
Self-Buffered, Dual Output, Micropower Reference
FEATURES
APPLICATIONS
n SO Package with Standard Pinout
n Supply Current per Amplifi er: 17μA Max
n Offset Voltage: 70μV Max
n Offset Current: 250pA Max
n Input Bias Current: 5nA Max
n Voltage Noise: 0.9µVP-P, 0.1Hz to 10Hz
n Current Noise: 1.5pAP-P, 0.1Hz to 10Hz
n Offset Voltage Drift: 0.5µV/°C
n Gain Bandwidth Product: 85kHz
n Slew Rate: 0.04V/µs
n Single Supply Operation
Input Voltage Range Includes Ground
Output Swings to Ground while Sinking Current
No Pull-Down Resistors Needed
n Output Sources and Sinks 5mA Load Current
n Battery- or Solar-Powered Systems
Portable Instrumentation
Remote Sensor Amplifi er
Satellite Circuitry
n Micropower Sample-and-Hold
n Thermocouple Amplifi er
n Micropower Filters
Supply Current vs Temperature
–
+
2
3
+
–
5
6
1/2 LT2178 1
0.1µF
250k
1M* 1M*
LT1004-1.2
4
7
2M 0.1µF
1.2365V
OUTPUT
1/2 LT2178 2.470V
OUTPUT
4V TO 9V
21789 TA01
TOTAL BATTERY CURRENT = 28mA
OUTPUT ACCURACY = p0.4% MAX
TEMPERATURE COEFFICIENT = 20ppm/°C
LOAD REGULATION = 25ppm/mA, IL≤ 5mA, V+≥ 5V
LINE REGULATION = 10ppm/V
* 0.1% FILM RESISTORS
8
TEMPERATURE (°C)
–50
SUPPLY CURRENT PER AMPLIFIER A)
–25 025 50
21789 TA02
75
20
18
16
14
12
10
100
VS = p15V
VS = 5V, 0V
VS = p1.5V
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
LT2178/LT2179
2
21789fc
ABSOLUTE MAXIMUM RATINGS
Supply Voltage ........................................................±22V
Differential Input Voltage.........................................±30V
Input Voltage ................ Equal to Positive Supply Voltage
............................. 5V Below Negative Supply Voltage
Output Short-Circuit Duration .......................... Indefi nite
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LT2178ACS8#PBF LT2178ACS8#TRPBF 2178A 8-Lead Plastic SO 0°C to 70°C
LT2178AIS8#PBF LT2178AIS8#TRPBF 2178AI 8-Lead Plastic SO –40°C to 85°C
LT2178CS8#PBF LT2178CS8#TRPBF 2178 8-Lead Plastic SO 0°C to 70°C
LT2178IS8#PBF LT2178IS8#TRPBF 2178I 8-Lead Plastic SO –40°C to 85°C
LT2179ACS#PBF LT2179ACS#TRPBF 2179A 14-Lead Plastic SO 0°C to 70°C
LT2179CS#PBF LT2179CS#TRPBF 2179 14-Lead Plastic SO 0°C to 70°C
LT2179IS#PBF LT2179IS#TRPBF 2179I 14-Lead Plastic SO –40°C to 85°C
LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LT2178ACS8 LT2178ACS8#TR 2178A 8-Lead Plastic SO 0°C to 70°C
LT2178AIS8 LT2178AIS8#TR 2178AI 8-Lead Plastic SO –40°C to 85°C
LT2178CS8 LT2178CS8#TR 2178 8-Lead Plastic SO 0°C to 70°C
LT2178IS8 LT2178IS8#TR 2178I 8-Lead Plastic SO –40°C to 85°C
LT2179ACS LT2179ACS#TR 2179A 14-Lead Plastic SO 0°C to 70°C
LT2179CS LT2179CS#TR 2179 14-Lead Plastic SO 0°C to 70°C
LT2179IS LT2179IS#TR 2179I 14-Lead Plastic SO –40°C to 85°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifi
cations, go to: http://www.linear.com/tapeandreel/
1
2
3
4
8
7
6
5
TOP VIEW
V+
OUT B
–IN B
+IN B
OUT A
–IN A
+IN A
V–
S8 PACKAGE
8-LEAD PLASTIC SO
+
–A
+
–
B
TJMAX = 150°C, θJA = 190°C/W
TOP VIEW
S PACKAGE
14-LEAD PLASTIC SO
1
2
3
4
5
6
7
14
13
12
11
10
9
8
OUT A
–IN A
+IN A
V+
+IN B
–IN B
OUT B
OUT D
–IN D
+IN D
V–
+IN C
–IN C
OUT C
+
–A
+
–
+
–
+
–
D
BC
TJMAX = 150°C, θJA = 150°C/W
PIN CONFIGURATION
Specifi ed Temperature Range
Commercial.............................................. 0°C to 70°C
Industrial ............................................. –40°C to 85°C
Storage Temperature Range ................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
LT2178/LT2179
3
21789fc
ELECTRICAL CHARACTERISTICS
V
S = 5V, 0V, VCM = 0.1V, VO = 1.4V, TA = 25°C, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS
LT2178AC/LT2178AI
LT2179AC
LT2178C/LT2178I
LT2179C/LT2179I
UNITSMIN TYP MAX MIN TYP MAX
VOS Input Offset Voltage LT2178
LT2179
30
35
70
100
40
40
120
150
V
V
ΔVOS
ΔTime
Long Term Input Offset
Voltage Stability
0.5 0.6 V/Mo
IOS Input Offset Current 0.05 0.25 0.05 0.35 nA
IBInput Bias Current 3 5 3 6 nA
enInput Noise Voltage 0.1Hz to 10Hz (Note 2) 0.9 2.0 0.9 µVP-P
Input Noise Voltage Density fO = 10Hz (Note 2)
fO = 1000Hz (Note 2)
50
49
75
65
50
49
nV√Hz
nV√Hz
inInput Noise Current 0.1Hz to 10Hz (Note 2) 1.5 2.5 1.5 pAP-P
Input Noise Current Density fO = 10Hz (Note 2)
fO = 1000Hz
0.03
0.01
0.07 0.03
0.01
pA√Hz
pA√Hz
Input Resistance
Differential Mode
Common Mode
(Note 3)
0.8 2
12
0.6 2
12
G
G
Input Voltage Range 3.5
0
3.9
–0.3
3.5
0
3.9
–0.3
V
V
CMRR Common Mode Rejection Ratio VCM = 0V to 3.5V 93 103 90 102 dB
PSRR Power Supply Rejection Ratio VS = 2.2V to 12V 94 104 92 104 dB
AVOL Large-Signal Voltage Gain VO = 0.03V to 4V, No Load (Note 3)
VO = 0.03V to 3.5V, RL = 50k
140
80
700
200
110
70
700
200
V/mV
V/mV
Maximum Output Voltage Swing Output Low, No Load
Output Low, 2k to GND
Output Low, ISINK = 100µA
6.5
0.2
120
9
0.6
160
6.5
0.2
120
9
0.6
160
mV
mV
mV
Output High, No Load
Output High, 2k to GND
4.2
3.5
4.4
3.8
4.2
3.5
4.4
3.8
V
V
SR Slew Rate AV = 1, CL = 10pF (Note 3) 0.013 0.025 0.013 0.025 V/µs
GBW Gain Bandwidth Product fO ≤ 5kHz 60 60 kHz
ISSupply Current per Amplifi er
VS = ±1.5V, VO = 0V
13
12
18
17
14
13
21
20
µA
µA
Channel Separation ΔVIN = 3V, RL = 10k 110 110 dB
Minimum Supply Voltage (Note 4) 2 2.2 2 2.2 V
SYMBOL PARAMETER CONDITIONS
LT2178AI LT2178I/LT2179I
UNITSMIN TYP MAX MIN TYP MAX
VOS Input Offset Voltage LT2178
LT2179
l
l
70
80
270
300
95
100
370
400
V
V
ΔVOS
ΔT
Input Offset Voltage Drift LT2178 (Note 5)
LT2179
l0.4
0.5
1.8
3
0.5
0.6
2.3
3.5
µV/ºC
µV/ºC
IOS Input Offset Current l0.07 0.70 0.1 1 nA
IBInput Bias Current l37 48 nA
CMRR Common Mode Rejection Ratio VCM = 0.05V to 3.2V l86 100 84 98 dB
PSRR Power Supply Rejection Ratio VS = 3V to 12V l88 100 86 100 dB
The l denotes the specifi cations which apply over the full operating temperature range. VS = 5V, 0V, VCM = 0.1V, VO = 1.4V,
–40°C ≤ TA ≤ 85°C for I-grades, unless otherwise noted. (Note 6)
LT2178/LT2179
4
21789fc
SYMBOL PARAMETER CONDITIONS
LT2178AI LT2178I/LT2179I
UNITSMIN TYP MAX MIN TYP MAX
AVOL Large-Signal Voltage Gain VO = 0.05V to 4V, No Load (Note 3)
VO = 0.05V to 3.5V, RL = 50k
l
l
75
40
350
130
50
30
350
130
V/mV
V/mV
Maximum Output Voltage Swing Output Low, No Load
Output Low, ISINK = 100µA
l
l
9
160
13
220
9
160
13
220
mV
mV
Output High, No Load
Output High, 2k to GND
l
l
3.9
3
4.2
3.7
3.9
3
4.2
3.7
V
V
ISSupply Current per Amplifi er l15 24 15 27 µA
The l denotes the specifi cations which apply over the full operating
temperature range. VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, –40°C ≤ TA ≤ 85°C for I-grades, unless otherwise noted. (Note 6)
SYMBOL PARAMETER CONDITIONS
LT2178AC/LT2179AC LT2178C/LT2179C
UNITSMIN TYP MAX MIN TYP MAX
VOS Input Offset Voltage LT2178
LT2179
l
l
50
60
170
200
65
70
250
290
V/mV
V/mV
ΔVOS
ΔT
Input Offset Voltage Drift LT2178 (Note 5)
LT2179
l
l
0.4
0.5
1.8
3
0.5
0.6
2.5
3.5
mV
mV
IOS Input Offset Current l0.06 0.35 0.06 0.5 nA
IBInput Bias Current l36 37 nA
CMRR Common Mode Rejection Ratio VCM = 0V to 3.4V l90 101 86 100 dB
PSRR Power Supply Rejection Ratio VS = 2.5V to 12V l90 102 88 102 dB
AVOL Large-Signal Voltage Gain VO = 0.05V to 4V, No Load (Note 3)
VO = 0.05V to 3.5V, RL = 50k
l
l
150
55
500
160
80
45
500
160
V/mV
V/mV
Maximum Output Voltage Swing Output Low, No Load
Output Low, ISINK = 100µA
l
l
8
140
11
190
8
140
11
190
mV
mV
Output High, No Load
Output High, 2k to GND
l
l
4.1
3.3
4.3
3.8
4.1
3.3
4.3
3.8
V
V
The l denotes the specifi cations which apply over the full operating temperature range. VS = 5V, 0V, VCM = 0.1V, VO = 1.4V,
0°C ≤ TA ≤ 70°C, unless otherwise noted. (Note 7)
VS = ±15V, TA = 25°C, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS
LT2178AC/LT2178AI
LT2179AC
LT2178C/LT2178I
LT2179C/LT2179I
UNITSMIN TYP MAX MIN TYP MAX
VOS Input Offset Voltage LT2178
LT2179
70
80
300
350
90
100
400
450
V
V
IOS Input Offset Current 0.05 0.25 0.05 0.35 nA
IBInput Bias Current 3 5 3 6 nA
Input Voltage Range 13.5
–15
13.9
–15.3
13.5
–15
13.9
–15.3
V
V
CMRR Common Mode Rejection Ratio VCM = 13.5V to –15V 96 106 93 106 dB
PSRR Power Supply Rejection Ratio VS = 5V, 0V to ±18V 96 112 94 112 dB
AVOL Large-Signal Voltage Gain VO = ±10V, RL = 50k
VO = ±10V, No Load
300
600
1200
2500
250
400
1000
2500
V/mV
V/mV
VOUT Maximum Output Voltage Swing RL = 50k
RL = 2k
±13
±11
±14.2
±12.7
±13
±11
±14.2
±12.7
V
V
SR Slew Rate AV = 1 0.02 0.04 0.02 0.04 V/µs
ELECTRICAL CHARACTERISTICS
LT2178/LT2179
5
21789fc
The l denotes the specifi cations which apply over the full operating temperature range. VS = ±15V, –40°C ≤ TA ≤ 85°C for I-grades,
unless otherwise noted.
SYMBOL PARAMETER CONDITIONS
LT2178AI LT2178I/LT2179I
UNITSMIN TYP MAX MIN TYP MAX
VOS Input Offset Voltage LT2178
LT2179
l
l
100
100
650
650
130
130
740
740
µV
µV
ΔVOS
ΔT
Input Offset Voltage Drift LT2178 (Note 5)
LT2179
l0.6
0.7
1.8
3
0.7
0.9
2.5
4
µV/ºC
µV/ºC
IOS Input Offset Current l0.07 0.7 0.1 1 nA
IBInput Bias Current l37 48 nA
AVOL Large-Signal Voltage Gain VO = ±10V, RL = 50k l150 500 100 500 V/mV
CMRR Common Mode Rejection Ratio VCM = 13V, –14.9V l90 105 88 103 dB
PSRR Power Supply Rejection Ratio VS = 0V, 5V to ±18V l92 110 88 109 dB
Maximum Output Voltage Swing RL = 5k l±11 ±13.5 ±11 ±13.5 V
ISSupply Current per Amplifi er l18 28 19 30 µA
SYMBOL PARAMETER CONDITIONS
LT2178AC/LT2179AC LT2178C/LT2179C
UNITSMIN TYP MAX MIN TYP MAX
VOS Input Offset Voltage LT2178
LT2179
l
l
100
120
480
550
130
150
660
750
µV
µV
ΔVOS
ΔT
Input Offset Voltage Drift LT2178 (Note 5)
LT2179
l0.6
0.7
1.5
3
0.7
0.9
2.5
4
µV/ºC
µV/ºC
IOS Input Offset Current l0.06 0.35 0.06 0.35 nA
IBInput Bias Current l36 37 nA
AVOL Large-Signal Voltage Gain VO = ±10V, RL = 50k l200 800 150 750 V/mV
CMRR Common Mode Rejection Ratio VCM = 13V, –15V l94 104 91 104 dB
PSRR Power Supply Rejection Ratio RL = 5k l93 110 91 110 dB
Maximum Output Voltage Swing RL = 5k l±11 ±13.6 ±11 ±13.6 V
ISSupply Current per Amplifi er l17 24 18 28 µA
The l denotes the specifi cations which apply over the full operating temperature range. VS = ±15V, 0°C ≤ TA ≤ 70°C, unless otherwise noted.
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: Typical parameters are defi ned as the 60% yield of parameter
distributions of individual amplifi ers, i.e., out of 100 LT2179s (or 100
LT2178s) typically 240 op amps (or 120) will be better than the indicated
specifi cation.
Note 3: This parameter is tested on a sample basis only. All noise
parameters are tested with VS = ±2.5V, VO = 0V.
Note 4: This parameter is guaranteed by design and is not tested.
Note 5: Power supply rejection ratio is measured at the minimum supply
voltage. The op amps actually work at 1.7V supply but with a typical offset
skew of –300µV.
Note 6: This parameter is not 100% tested.
Note 7: During testing at –40°C, the 5V power supply turn-on time is less
than 0.5s.
Note 8: The LT2178C/LT2179C are designed, characterized and expected
to meet the industrial temperature limits, but are not tested at –40°C and
85°C. I-grade parts are guaranteed.
The l denotes the specifi cations which apply over the full operating
temperature range. VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, –40°C ≤ TA ≤ 85°C for I-grades, unless otherwise noted. (Note 6)
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS
LT2178AC/LT2178AI
LT2179AC
LT2178C/LT2178I
LT2179C/LT2179I
UNITSMIN TYP MAX MIN TYP MAX
GBW Gain Bandwidth Product fO ≤ 5kHz 85 85 kHz
ISSupply Current per Amplifi er 16 21 17 25 µA
LT2178/LT2179
6
21789fc
TYPICAL PERFORMANCE CHARACTERISTICS
OFFSET VOLTAGE (µV)
–150
0
NUMBER OF OP AMPS
200
400
600
800
–100 –50 0 50
21789 G01
100 150
VS = 5V, 0V
TA = 25°C
2500 OP AMPS
TESTED
POSITIVE SUPPLY VOLTAGE (V)
0
OFFSET VOLTAGE SHIFT (µV)
100
0
–100
–200
–300
–400
–500
21789 G02
123
V– = 0V
NONFUCTIONAL
–40°C
25°C
85°C
TEMPERATURE (°C)
–50
25
50
75
25 75
21789 G03
–2.5
–3.0
–25 0 50 100
–3.5
–4.0
INPUT OFFSET
CURRENT (pA)
INPUT BIAS
CURRENT (nA)
100
IOS
IB
VS = 5V, 0V
TEMPERATURE (°C)
SATURATION VOLTAGE (mV)
1000
100
10
1
0.1
–50 0 25 50 75 100
21789 G04
–25
ISINK = 1mA
ISINK = 100µA
ISINK = 1µA
NO LOAD
10k TO GROUND
2k TO GROUND
VS = 5V, 0V
TIME FROM OUTPUT SHORT TO GROUND (MINUTES)
0
SHORT CIRCUIT CURRENT (mA)
SINKING SOURCING
20
10
0
–10
–20
–30 2
21789 G05
1
VS = p15V
VS = p15V
VS = p2.5V
VS = p2.5V
VS = 5V, 0V
TIME (SECONDS)
0
NOISE VOLTAGE (0.4µV/DIV)
2468
10 12
CHANNEL A
CHANNEL B
TA = 25°C, VS = p2.5V
21789 G06
TIME (SECONDS)
0
NOISE VOLTAGE (0.4µV/DIV)
20 40 60 80
21789 G07
100 120
CHANNEL A
CHANNEL B
TA = 25°C, VS = p2.5V
FREQUENCY (Hz)
0.1
10
VOLTAGE NOISE DENSITY (nVHz)
CURRENT NOISE DENSITY (fAHz)
100
300
30
1000
1 100010010
21789 G08
TA = 25°C
VS = p2.5V
CURRENT
NOISE
VOLTAGE NOISE
1/f CORNER
0.5Hz
FREQUENCY (Hz)
0.001
VOLTAGE GAIN (dB)
100k
217879 G09
0.1 10 1k
0.01 1M
1100 10k
140
120
100
80
60
40
20
0
–20
VS = p15V
VS = 5V, 0V
TA = 25°C
Output Saturation vs Temperature
vs Sink Current Short-Circuit Current 0.1Hz to 10Hz Noise
0.01Hz to 10Hz Noise Noise Spectrum Voltage Gain vs Frequency
Distribution of Input
Offset Voltage Minimum Supply Voltage
Input Bias and Offset Currents
vs Temperature
LT2178/LT2179
7
21789fc
TYPICAL PERFORMANCE CHARACTERISTICS
FREQUENCY (Hz)
30
20
10
0
–10 100k
21789 G10
VOLTAGE GAIN (dB)
PHASE SHIFT (DEG)
10k 1M
80
100
120
140
160
180
200
220
240
TA = 25°C
NO LOAD
PHASE
p15V
PHASE
5V, 0V,
GAIN
5V, 0V
GAIN
p15V
LOAD RESISTANCE TO GROUND ()
10k
10k
VOLTAGE GAIN (V/V)
100k
1M
10M
100k 1M 10M
217879 G11
VS = p15V, TA = 25°C
VS = 5V, 0V, TA = 25°C
VS = 5V, 0V, TA = 85°C
CAPACITIVE LOAD (pF)
10
OVERSHOOT (%)
120
100
80
60
40
20
0100 1000 10000
20789 G12
VS = 5V, 0V
AV = 1
AV = 5 AV = 10
21789 G13
5V/DIV
500µs/DIV
AV = 1
CL= 12pF
21789 G14
1V/DIV
100µs/DIV
AV = 1
CL= 12pF
INPUT PULSE = 0V TO 3.8V
21789 G15
20mV/DIV
20µs/DIV
AV = 1
CL= 12pF
21789 G16
20mV/DIV
20µs/DIV
AV = 1
CL= 12pF
21789 G17
20mV/DIV
20µs/DIV
AV = 1
CL= 12pF
INPUT PULSE = 50mV TO 150mV
FREQUENCY (Hz)
1
COMMON MODE REJECTION RATIO (dB)
120
100
80
60
40
20
010 100 1k 10k
21789 G18
100k
TA = 25°C
VS = 5V, 0V VS = p15V
Large-Signal Transient Response
VS = ±15V
Large-Signal Transient Response
VS = 5V, 0V
Small-Signal Transient Response
VS = ±2.5V
Small-Signal Transient Response
VS = ±15V
Small-Signal Transient Response
VS = 5V, 0V
Common Mode Rejection Ratio
vs Frequency
Gain, Phase vs Frequency Voltage Gain vs Load Resistance Capacitive Load Handling
LT2178/LT2179
8
21789fc
TYPICAL PERFORMANCE CHARACTERISTICS
OPERATING FREQUENCY (Hz)
0.1
PSRR (dB)
120
100
80
60
40
20
0110 100 1k
21789 G19
10k 100k
TA = 25°C
VS = p2.5V + 1VP-P SINE WAVE
NEGATIVE
SUPPLY
POSITIVE
SUPPLY
FREQUENCY (Hz)
10
1
OUTPUT IMPEDANCE ()
10
100
10k
100 1k
21789 G20
1k
10k 100k
ACL = 100
ACL = 10
ACL = 1
TA = 25°C
VS = 5V, 0V
IL = 0
Power Supply Rejection Ratio
vs Frequency Closed Loop Output Impedance
SIMPLIFIED SCHEMATIC
1/2 LT2178
1/4 LT2179
10k 10k 2.2k 5.6k
Q5 Q6
Q11
600
600
Q1
Q21
Q2
Q22
Q9
C2
175pF
6.2k
Q7
Q28
4
1
Q12
Q3
Q16 Q14
Q29
Q4 Q24
8.6k C1
50pF
C5
2.5pF
Q27
V+
Q10 Q17
Q8
6.2k
Q19
Q18
Q15 Q32
1.3k 6.4k
Q37
Q30
13
Q25
C4
4pF 2.9k
3k
Q31
C3
40pF
Q23
Q20
2A
3k 30
Q34
Q36
OUT
Q26
30
Q35
33k
Q54
112
150k
Q33
10k
V+
Q38
5.35k
Q45
Q55
Q51
Q42
Q44
V+
V–
Q46
Q47
11.5k
V+
12.5k
Q40
Q41
Q48
9.1k
Q43
V–
700k
700k
21789 SS
IN–
IN+
Q50 Q49
J1
Q39
2A
Q53
Q52
LT2178/LT2179
9
21789fc
Please see the LT2078/LT2079 data sheet for applications
information. All comments relating to specifi cations, single
APPLICATIONS INFORMATION
supply operation and phase reversal protection are directly
applicable to the LT2178/LT2179.
–
+
–
+
++
VIN
0V TO 5V
220k*
50k
1MHz
TRIM 100Hz TRIM
240k TYP
2k
2µF
0.33µF
S1
D1
D2
S2
S3
D3
D4
S4
0.022µF
500pF
POLYSTYRENE
3pF
0.01µF
47k Q8
2N3906
12k
1.5M
NC
Q7
2N3904
74C14
1N1
1N3
1N4
1N2
GND
V–
V+
FOUT
RESET VSS
VDD
CLK Q7
CD4024
1µF
1N4148
1µF
100 A2
1/2 LT2178
10k
7V TO 10V
100k
LT1004-2.5
LTC®201
A1
1/2 LT2178
21789 TA03
10M
LINEARITY IS 0.02%
QUIESCENT CURRENT IS 90µA
SUPPLY CURRENT IS 360µA AT 1MHz
DRIFT = 50ppm/°C
*TRWMTR/5 + 120ppm/°C
Micropower 100Hz to 1MHz V-to-F Converter
LT2178/LT2179
10
21789fc
S Package
14-Lead Plastic Small Outline (Narrow 0.150)
(Reference LTC DWG # 05-08-1610)
PACKAGE DESCRIPTION
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(Reference LTC DWG # 05-08-1610)
.016 – .050
(0.406 – 1.270)
.010 – .020
(0.254 – 0.508)s 45o
0o– 8o TYP
.008 – .010
(0.203 – 0.254)
SO8 0303
.053 – .069
(1.346 – 1.752)
.014 – .019
(0.355 – 0.483)
TYP
.004 – .010
(0.101 – 0.254)
.050
(1.270)
BSC
1234
.150 – .157
(3.810 – 3.988)
NOTE 3
8765
.189 – .197
(4.801 – 5.004)
NOTE 3
.228 – .244
(5.791 – 6.197)
.245
MIN .160 p.005
RECOMMENDED SOLDER PAD LAYOUT
.045 p.005
.050 BSC
.030 p.005
TYP
INCHES
(MILLIMETERS)
NOTE:
1. DIMENSIONS IN
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
1
N
234
.150 – .157
(3.810 – 3.988)
NOTE 3
14 13
.337 – .344
(8.560 – 8.738)
NOTE 3
.228 – .244
(5.791 – 6.197)
12 11 10 9
567
N/2
8
.016 – .050
(0.406 – 1.270)
.010 – .020
(0.254 – 0.508)s 45o
0o – 8o TYP
.008 – .010
(0.203 – 0.254)
S14 0502
.053 – .069
(1.346 – 1.752)
.014 – .019
(0.355 – 0.483)
TYP
.004 – .010
(0.101 – 0.254)
.050
(1.270)
BSC
.245
MIN
N
1 2 3 N/2
.160 p.005
RECOMMENDED SOLDER PAD LAYOUT
.045 p.005
.050 BSC
.030 p.005
TYP
INCHES
(MILLIMETERS)
NOTE:
1. DIMENSIONS IN
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
LT2178/LT2179
11
21789fc
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
REVISION HISTORY
REV DATE DESCRIPTION PAGE NUMBER
C 3/10 Correct the part numbers on S Package in the Order Information Section. 2
Update to graph G04 6
(Revision history begins at Rev C)
LT2178/LT2179
12
21789fc
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
© LINEAR TECHNOLOGY CORPORATION 1996
LT 0310 REV C • PRINTED IN USA
RELATED PARTS
TYPICAL APPLICATION
PART NUMBER DESCRIPTION COMMENTS
LT1078/LT1079 Dual/Quad 55µA Max, Single Supply Precision Op Amps 70µV VOS Max and 2.5µV/°C Drift Max, 200kHz BBW,
0.07V/µs Slew Rate, Input/Output Common Mode Includes Ground
LT1211/LT1212 14MHz, 7V/µs Single Supply Dual and Quad Precision Op Amps 275µV VOS Max, 6µV/°C Drift Max Input Voltage Range Includes Ground
LT1490/LT1491 Dual/ Quad Micropower Rail-to-Rail Input and Output Op Amps Single Supply Input Range: –0.4V to 44V, Micropower 50µA Amplifi er,
Rail-to-Rail Input and Output, 200kHz GBW
LT2078/LT2079 Dual/Quad 55µA Max, Single Supply Precision Op Amps 70µV VOS Max and 2.5µV/°C Drift Max, 200kHz BBW,
0.07V/µs Slew Rate, Input/Output Common Mode Includes Ground
Surface Mount Standard Pinout
R1
301k
50k
C1
1000pF
21789 TA04
VOUT
1µF
R2
86k
VIN
50k
–
+
1/4
LT2179 –
+
1/4
LT2179
301k
121k –
+
1/4
LT2179
C2
1000pF
1000pF
221k
1000pF
–
+
1/4
LT2179
3.3V
121k
12-BIT ACCURATE SIGNAL RANGE FROM 6mV TO 1.8V ON 3.3V SINGLE SUPPLY.
MAXIMUM OUTPUT OFFSET ERROR IS 448µV.
FOR EACH 2ND ORDER SECTION:
WO2 = 1
C1C2R1R2
R1 = 1
WOQC1
R2 = Q
WOC2
+
Single Supply, 1kHz, 4th Order Butterworth Lowpass Filter
FREQUENCY (kHz)
0.1
GAIN(dB)
10
0
–10
–20
–30
–40
–50
–60
–70
–80
–90 110
21789 TA05
