LMH6640
LMH6640 TFT-LCD Single, 16V Rail-to-Rail High Output Operational Amplifier
Literature Number: SNOSAA0A
LMH6640
TFT-LCD Single, 16V Rail-to-Rail High Output
Operational Amplifier
General Description
The LMH™6640 is a voltage feedback operational amplifier
with a rail-to-rail output drive capability of 100 mA. Employ-
ing National’s patented VIP10 process, the LMH6640 deliv-
ers a bandwidth of 190 MHz at a current consumption of only
4mA. An input common mode voltage range extending to
0.3V below the V− and to within 0.9V of V
+
, makes the
LMH6640 a true single supply op-amp. The output voltage
range extends to within 100 mV of either supply rail providing
the user with a dynamic range that is especially desirable in
low voltage applications.
The LMH6640 offers a slew rate of 170 V/µs resulting in a full
power bandwidth of approximately 28 MHz with 5V single
supply (2 V
PP
, −1 dB). Careful attention has been paid to
ensure device stability under all operating voltages and
modes. The result is a very well behaved frequency re-
sponse characteristic for any gain setting including +1, and
excellent specifications for driving video cables including
total harmonic distortion of −64 dBc @5 MHz, differential
gain of 0.12% and differential phase of 0.12˚.
Features
(V
S
= 16V, R
L
=2kΩto V
+
/2, 25˚C, Typical Values Unless
Specified)
nSupply current (no load) 4 mA
nOutput resistance (closed loop 1 MHz) 0.35Ω
n−3 dB BW (A
V
= 1) 190 MHz
nSettling time (±0.1%, 2 V
PP
)35ns
nInput common mode voltage −0.3V to 15.1V
nOutput voltage swing 100 mV from rails
nLinear output current ±100 mA
nTotal harmonic distortion (2 V
PP
, 5 MHz) −64 dBc
nFully characterized for: 5V & 16V
nNo output phase reversal with CMVR exceeded
nDifferential gain (R
L
= 150Ω) 0.12%
nDifferential phase (R
L
= 150Ω) 0.12˚
Applications
nTFT panel V
COM
buffer amplifier
nActive filters
nCD/DVD ROM
nADC buffer amplifier
nPortable video
nCurrent sense buffer
Typical Application
20086234
Typical Application as a TFT Panel V
COM
Driver
LMH™is a trademark of National Semiconductor Corporation.
November 2004
LMH6640 TFT-LCD Single, 16V Rail-to-Rail High Output Operational Amplifier
© 2004 National Semiconductor Corporation DS200862 www.national.com
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
ESD Tolerance (Note 2)
Human Body Model 2 KV
Machine Model 200V
V
IN
Differential ±2.5V
Input Current ±10 mA
Supply Voltages (V
+
–V
−
) 18V
Voltage at Input/Output Pins V
+
+0.8V, V
−
−0.8V
Storage Temperature Range −65˚C to +150˚C
Junction Temperature (Note 4) +150˚C
Soldering Information
Infrared or Convection (20 sec.) 235˚C
Wave Soldering (10 sec.) 260˚C
Operating Ratings (Note 3)
Supply Voltage (V
+
–V
−
) 4.5V to 16V
Operating Temperature Range
(Note 4)
−40˚C to +85˚C
Package Thermal Resistance (Note 4)
5-Pin SOT23 265˚C/W
5V Electrical Characteristics
Unless otherwise specified, All limits guaranteed for T
J
= 25˚C, V
+
= 5V, V
−
= 0V, V
O
=V
CM
=V
+
/2 and R
L
=2kΩto V
+
/2.
Boldface limits apply at temperature extremes. (Note 9)
Symbol Parameter Conditions Min
(Note 6)
Typ
(Note 5)
Max
(Note 6)
Units
BW −3 dB Bandwidth A
V
=+1(R
L
= 100Ω) 150 MHz
A
V
=−1(R
L
= 100Ω)58
BW
0.1 dB
0.1 dB Gain Flatness A
V
= −3 18 MHz
FPBW Full Power Bandwidth A
V
= +1, V
OUT
=2V
PP
,−1dB 28 MHz
LSBW -3 dB Bandwidth A
V
= +1, V
O
=2V
PP
(R
L
= 100Ω) 32 MHz
GBW Gain Bandwidth Product A
V
= +1, (R
L
= 100Ω) 59 MHz
SR Slew Rate (Note 8) A
V
= −1 170 V/µs
e
n
Input Referred Voltage Noise f = 10 kHz 23 nV/
f = 1 MHz 15
i
n
Input Referred Current Noise f = 10 kHz 1.1 pA/
f = 1 MHz 0.7
THD Total Harmonic Distortion f = 5 MHz, V
O
=2V
PP
,A
V
=+2
R
L
=1kΩto V
+
/2
–65 dBc
t
s
Settling Time V
O
=2V
PP
,±0.1%, A
V
=−1 35 ns
V
OS
Input Offset Voltage 15
7mV
I
B
Input Bias Current (Note 7) −1.2 −2.6
−3.25 µA
I
OS
Input Offset Current 34 800
1400 nA
CMVR Common Mode Input Voltage
Range
CMRR ≥50 dB –0.3 –0.2
–0.1 V
4.0
3.6
4.1
CMRR Common Mode Rejection Ratio V
−
≤V
CM
≤V
+
−1.5V 72 90 dB
A
VOL
Large Signal Voltage Gain V
O
=4V
PP
,R
L
=2kΩto V
+
/2 86
82
95
dB
V
O
= 3.75 V
PP
,R
L
= 150Ωto V
+
/2 74
70
78
V
O
Output Swing High R
L
=2kΩto V
+
/2 4.90 4.94
V
R
L
= 150Ωto V
+
/2 4.75 4.80
Output Swing Low R
L
=2kΩto V
+
/2 0.06 0.10
R
L
= 150Ωto V
+
/2 0.20 0.25
LMH6640
www.national.com 2
5V Electrical Characteristics (Continued)
Unless otherwise specified, All limits guaranteed for T
J
= 25˚C, V
+
= 5V, V
−
= 0V, V
O
=V
CM
=V
+
/2 and R
L
=2kΩto V
+
/2.
Boldface limits apply at temperature extremes. (Note 9)
Symbol Parameter Conditions Min
(Note 6)
Typ
(Note 5)
Max
(Note 6)
Units
I
SC
Output Short Circuit Current
(Note 3)
Sourcing to V
+
/2 100
75
130
mA
Sinking from V
+
/2 100
70
130
I
OUT
Output Current V
O
= 0.5V from either Supply +75/−90 mA
PSRR Power Supply Rejection Ratio 4V ≤V
+
≤6V 72 80 dB
I
S
Supply Current No Load 3.7 5.5
8.0
mA
R
IN
Common Mode Input
Resistance
A
V
=+1,f=1kHz, R
S
=1MΩ15 MΩ
C
IN
Common Mode Input
Capacitance
A
V
= +1, R
S
= 100 kΩ1.7 pF
R
OUT
Output Resistance Closed Loop R
F
=10kΩ,f=1kHz, A
V
= −1 0.1 Ω
R
F
=10kΩ,f=1MHz, A
V
= −1 0.4
DG Differential Gain NTSC, A
V
=+2
R
L
= 150Ωto V
+
/2
0.13 %
DP Differential Phase NTSC, A
V
=+2
R
L
= 150Ωto V
+
/2
0.10 deg
16V Electrical Characteristics
Unless otherwise specified, All limits guaranteed for T
J
= 25˚C, V
+
= 16V, V
−
= 0V, V
O
=V
CM
=V
+
/2 and R
L
=2kΩto V
+
/2.
Boldface limits apply at temperature extremes. (Note 9)
Symbol Parameter Conditions Min
(Note 6)
Typ
(Note 5)
Max
(Note 6)
Units
BW −3 dB Bandwidth A
V
=+1(R
L
= 100Ω) 190 MHz
A
V
=−1(R
L
= 100Ω)60
BW
0.1 dB
0.1 dB Gain Flatness A
V
= −2.7 20 MHz
LSBW -3 dB Bandwidth A
V
= +1, V
O
=2V
PP
(R
L
= 100Ω) 35 MHz
GBW Gain Bandwidth Product A
V
= +1, (R
L
= 100Ω) 62 MHz
SR Slew Rate (Note 8) A
V
= −1 170 V/µs
e
n
Input Referred Voltage Noise f = 10 kHz 23 nV/
f = 1 MHz 15
i
n
Input Referred Current Noise f = 10 kHz 1.1 pA/
f = 1 MHz 0.7
THD Total Harmonic Distortion f = 5 MHz, V
O
=2V
PP
,A
V
=+2
R
L
=1kΩto V
+
/2
–64 dBc
t
s
Settling Time V
O
=2V
PP
,±0.1%, A
V
=−1 35 ns
V
OS
Input Offset Voltage 1 5
7mV
I
B
Input Bias Current (Note 7) −1 −2.6
−3.5 µA
I
OS
Input Offset Current 34 800
1800 nA
CMVR Common Mode Input Voltage
Range
CMRR ≥50 dB –0.3 −0.2
−0.1 V
15.0
14.6
15.1
CMRR Common Mode Rejection Ratio V
−
≤V
CM
≤V
+
−1.5V 72 90 dB
LMH6640
www.national.com3
16V Electrical Characteristics (Continued)
Unless otherwise specified, All limits guaranteed for T
J
= 25˚C, V
+
= 16V, V
−
= 0V, V
O
=V
CM
=V
+
/2 and R
L
=2kΩto V
+
/2.
Boldface limits apply at temperature extremes. (Note 9)
Symbol Parameter Conditions Min
(Note 6)
Typ
(Note 5)
Max
(Note 6)
Units
A
VOL
Large Signal Voltage Gain V
O
=15V
PP
,R
L
=2kΩto V
+
/2 86
82
95
dB
V
O
=14V
PP
,R
L
= 150Ωto V
+
/2 74
70
78
V
O
Output Swing High R
L
=2kΩto V
+
/2 15.85 15.90
V
R
L
= 150Ωto V
+
/2 15.45 15.78
Output Swing Low R
L
=2kΩto V
+
/2 0.10 0.15
R
L
= 150Ωto V
+
/2 0.21 0.55
I
SC
Output Short Circuit Current
(Note 3)
Sourcing to V
+
/2 60
30
95
mA
Sinking from V
+
/2 50
15
75
I
OUT
Output Current V
O
= 0.5V from either Supply ±100 mA
PSRR Power Supply Rejection Ratio 15V ≤V
+
≤17V 72 80 dB
I
S
Supply Current No Load 4 6.5
7.8 mA
R
IN
Common Mode Input
Resistance
A
V
=+1,f=1kHz, R
S
=1MΩ32 MΩ
C
IN
Common Mode Input
Capacitance
A
V
= +1, R
S
= 100 kΩ1.7 pF
R
OUT
Output Resistance Closed Loop R
F
=10kΩ,f=1kHz, A
V
= −1 0.1 Ω
R
F
=10kΩ,f=1MHz, A
V
= −1 0.3
DG Differential Gain NTSC, A
V
=+2
R
L
= 150Ωto V
+
/2
0.12 %
DP Differential Phase NTSC, A
V
=+2
R
L
= 150Ωto V
+
/2
0.12 deg
Note 1: Absolute maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics.
Note 2: Human body model, 1.5 kΩin series with 100 pF. Machine Model, 0Ωin series with 200 pF.
Note 3: Applies to both single-supply and split-supply operation. Continuous short circuit operation at elevated ambient temperature can result in exceeding the
maximum allowed junction temperature of 150 ˚C Short circuit test is a momentary test. Output short circuit duration is infinite for VS<6V at room temperature and
below. For VS>6V, allowable short circuit duration is 1.5 ms.
Note 4: The maximum power dissipation is a function of TJ(MAX),θJA , and TA. The maximum allowable power dissipation at any ambient temperature is
PD=(T
J(MAX)-TA)/θJA. All numbers apply for packages soldered directly onto a PC board.
Note 5: Typical Values represent the most likely parametric norm.
Note 6: All limits are guaranteed by testing or statistical analysis.
Note 7: Positive current corresponds to current flowing into the device.
Note 8: Slew rate is the average of the rising and falling slew rates
Note 9: Electrical Table values apply only for factory testing conditions at the temperature indicated. Factory testing conditions result in very limited self-heating of
the device such that TJ=T
A. No guarantee of parametric performance is indicated in the electrical tables under conditions of internal self-heating where TJ>TA.
LMH6640
www.national.com 4
Connection Diagram
5-Pin SOT23
20086223
Top View
Ordering Information
Package Part Number Package Marking Transport Media NSC Drawing
5-Pin SOT23 LMH6640MF AH1A 1k Units Tape and Reel MF05A
LMH6640MFX 3k Units Tape and Reel
LMH6640
www.national.com5
Typical Performance Characteristics At T
J
= 25˚C, V
+
=16V,V
−
= 0V, R
F
= 330Ωfor A
V
= +2, R
F
=1kΩfor A
V
= −1. R
L
tied to V
+
/2. Unless otherwise specified.
I
S
vs. V
S
for Various Temperature I
S
vs. V
CM
for Various Temperature
20086221 20086220
I
B
vs. V
S
for Various Temperature I
B
vs. V
S
for Various Temperature
20086218 20086219
V
OS
vs. V
S
for Various Temperature
(Typical Unit) I
OS
vs. V
S
for Various Temperature
20086216 20086227
LMH6640
www.national.com 6
Typical Performance Characteristics At T
J
= 25˚C, V
+
=16V,V
−
= 0V, R
F
= 330Ωfor A
V
= +2, R
F
=
1kΩfor A
V
= −1. R
L
tied to V
+
/2. Unless otherwise specified. (Continued)
Positive Output Saturation Voltage vs.
V
S
for Various Temperature
Negative Output Saturation Voltage vs.
V
S
for Various Temperature
20086224 20086228
Output Sinking Saturation Voltage vs.
I
SINKING
for Various Temperature
Output Sourcing Saturation Voltage vs.
I
SOURCING
for Various Temperature
20086230 20086231
Input Current Noise vs. Frequency Input Voltage Noise vs. Frequency
20086204 20086205
LMH6640
www.national.com7
Typical Performance Characteristics At T
J
= 25˚C, V
+
=16V,V
−
= 0V, R
F
= 330Ωfor A
V
= +2, R
F
=
1kΩfor A
V
= −1. R
L
tied to V
+
/2. Unless otherwise specified. (Continued)
Gain vs. Frequency Normalized
(P
IN
= −30 dBm)
Gain vs. Frequency Normalized
(P
IN
=−30dBm)
20086206 20086207
Gain vs. Frequency for Various V
S
(P
IN
= −30 dBm)
Gain vs. Frequency for Various V
S
(P
IN
= −30 dBm)
20086209 20086210
Open Loop Gain & Phase vs. Frequency for
Various Temperature (P
IN
= −30 dBm)
Relative Gain vs. Frequency for Various Temperature
(P
IN
= −10 dBm)
20086233 20086232
LMH6640
www.national.com 8
Typical Performance Characteristics At T
J
= 25˚C, V
+
=16V,V
−
= 0V, R
F
= 330Ωfor A
V
= +2, R
F
=
1kΩfor A
V
= −1. R
L
tied to V
+
/2. Unless otherwise specified. (Continued)
Large Signal Transition Large Signal Transition
20086213 20086214
Small Signal Pulse Response Small Signal Pulse Response
20086208 20086215
Large Signal Pulse Response Large Signal Pulse Response
20086211 20086212
LMH6640
www.national.com9
Typical Performance Characteristics At T
J
= 25˚C, V
+
=16V,V
−
= 0V, R
F
= 330Ωfor A
V
= +2, R
F
=
1kΩfor A
V
= −1. R
L
tied to V
+
/2. Unless otherwise specified. (Continued)
PSRR vs. Frequency CMRR vs. Frequency
20086201 20086217
Closed Loop Output Resistance vs. Frequency Harmonic Distortion
20086203
20086226
0.1 dB Gain Flatness vs. Frequency Normalized Output Power vs. Input Power (A
V
= +1)
20086202 20086229
LMH6640
www.national.com 10
Typical Performance Characteristics At T
J
= 25˚C, V
+
=16V,V
−
= 0V, R
F
= 330Ωfor A
V
= +2, R
F
=
1kΩfor A
V
= −1. R
L
tied to V
+
/2. Unless otherwise specified. (Continued)
Differential Gain/Phase vs. IRE
20086225
Application Notes
With its high output current and speed, one of the major
applications for the LMH6640 is the V
COM
driver in a TFT
panel. This application is a specially taxing one because of
the demands it places on the operational amplifier’s output to
drive a large amount of bi-directional current into a heavy
capacitive load while operating under unity gain condition,
which is a difficult challenge due to loop stability reasons.
For a more detailed explanation of what a TFT panel is and
what its amplifier requirements are, please see the Applica-
tion Notes section of the LM6584 found on the web at:
http://www.national.com/ds.cgi/LM/LM6584.pdf
Because of the complexity of the TFT V
COM
waveform and
the wide variation in characteristics between different TFT
panels, it is difficult to decipher the results of circuit testing in
an actual panel. The ability to make simplifying assumptions
about the load in order to test the amplifier on the bench
allows testing using standard equipment and provides famil-
iar results which could be interpreted using standard loop
analysis techniques. This is what has been done in this
application note with regard to the LMH6640’s performance
when subjected to the conditions found in a TFT V
COM
application.
Figure 1, shows a typical simplified V
COM
application with
the LMH6640 buffering the V
COM
potential (which is usually
around
1
⁄
2
of panel supply voltage) and looking into the
simplified model of the load. The load represents the cumu-
lative effect of all stray capacitances between the V
COM
node and both row and column lines. Associated with the
capacitances shown, is the distributed resistance of the lines
to each individual transistor switch. The other end of this R-C
ladder is driven by the column driver in an actual panel and
here is driven with a low impedance MOSFET driver (labeled
“High Current Driver”) for the purposes of this bench test to
simulate the effect that the column driver exerts on the V
COM
load.
The modeled TFT V
COM
load, shown in Figure 1, is based on
the following simplifying assumptions in order to allow for
easy bench testing and yet allow good matching results
obtained in the actual application:
•The sum of all the capacitors and resistors in the R-C
ladder is the total V
COM
capacitance and resistance re-
spectively. This total varies from panel to panel; capaci-
tance could range from 50 nF-200 nF and the resistance
could be anywhere from 20Ω-100Ω.
•The number of ladder sections has been reduced to a
number (4 sections in this case) which can easily be put
together in the lab and which behaves reasonably close
to the actual load.
In this example, the LMH6640 was tested under the simu-
lated conditions of total 209 nF capacitance and 54Ωas
shown in Figure 1.
R
S
is sometimes used in the panel to provide additional
isolation from the load while R
F2
provides a more direct
feedback from the V
COM
.R
F1
,R
F2
, and R
S
are trimmed in
the actual circuit with settling time and stability trade-offs
considered and evaluated. When tested under simulated
load conditions of Figure 1, here are the resultant voltage
and current waveforms at the LMH6640 output:
20086235
FIGURE 1. LMH6640 in a V
COM
Buffer Application with
Simulated TFT Load
LMH6640
www.national.com11
Application Notes (Continued)
As can be seen, the LMH6640 is capable of supplying up to
160 mA of output current and can settle the output in 4.4 µs.
The LMH6640 is a cost effective amplifier for use in the TFT
V
COM
application and is made even more attractive by its
large supply voltage range and high output current. The
combination of all these features is not readily available in
the market, especially in the space saving SOT23-5 pack-
age. All this performance is achieved at the low power con-
sumption of 65 mW which is of utmost importance in today’s
battery driven TFT panels.
20086236
FIGURE 2. V
COM
Output, High Current Drive Waveform, & LMH6640 Output Current Waveforms
20086237
FIGURE 3. Expanded View of Figure 2 Waveforms showing LMH6640 Current Sinking
1
⁄
2
Cycle
LMH6640
www.national.com 12
Physical Dimensions inches (millimeters)
unless otherwise noted
5-Pin SOT23
NS Product Number MF05A
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves
the right at any time without notice to change said circuitry and specifications.
For the most current product information visit us at www.national.com.
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LMH6640 TFT-LCD Single, 16V Rail-to-Rail High Output Operational Amplifier
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