LM6132 Dual/LM6134 Quad
Low Power 10 MHz Rail-to-Rail I/O Operational
Amplifiers

General Description

The LM6132/34 provides new levels of speed vs power per-
formance in applications where low voltage supplies or
power limitations previously made compromise necessary.
With

only

360 µA/amp

supply

current,

the

MHz

gain-bandwidth of this device supports new portable applica-
tions where higher power devices unacceptably drain battery
life.

The LM6132/34 can be driven by voltages that exceed both
power supply rails, thus eliminating concerns over exceeding
the common-mode voltage range. The rail-to-rail output
swing capability provides the maximum possible dynamic
range at the output. This is particularly important when oper-
ating on low supply voltages. The LM6132/34 can also drive
large capacitive loads without oscillating.

Operating on supplies from 2.7V to over 24V, the LM6132/34
is excellent for a very wide range of applications, from bat-
tery operated systems with large bandwidth requirements to
high speed instrumentation.

Features

(For 5V Supply, Typ Unless Noted)

Rail-to-Rail input CMVR -0.25V to 5.25V

Rail-to-Rail output swing 0.01V to 4.99V

High gain-bandwidth, 10 MHz at 20 kHz

Slew rate 12 V/µs

Low supply current 360 µA/Amp

Wide supply range 2.7V to over 24V

CMRR 100 dB

Gain 100 dB with R

= 10k

PSRR 82 dB

Applications

Battery operated instrumentation

Instrumentation Amplifiers

Portable scanners

Wireless communications

Flat panel display driver

Connection Diagrams

Ordering Information

Package

Temperature Range

NSC

Transport

Industrial, -40°C to +85°C

Drawing

Media

8-Pin Molded DIP

LM6132AIN, LM6132BIN

N08E

Rails

8-Pin Small Outline

LM6132AIM, LM6132BIM

M08A

Rails

LM6132AIMX, LM6132BIMX

M08A

Tape and Reel

14-Pin Molded DIP

LM6134AIN, LM6134BIN

N14A

Rails

14-Pin Small Outline

LM6134AIM, LM6134BIM

M14A

Rails

LM6134AIMX, LM6134BIMX

M14A

Tape and Reel

8-Pin DIP/SO

DS012349-1

Top View

14-Pin DIP/SO

DS012349-2

Top View

April 2000

LM6132

Dual

and

LM6134

Quad,

Low

Power

10
MHz

Rail-to-Rail

I/O

Operational

Amplifiers

DS012349

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)

2500V

Differential Input Voltage

15V

Voltage at Input/Output Pin

)+0.3V, (V

)-0.3V

Supply Voltage (V

)

35V

Current at Input Pin

10 mA

Current at Output Pin (Note 3)

25 mA

Current at Power Supply Pin

50 mA

Lead Temp. (soldering, 10 sec.)

260°C

Storage Temperature Range

-65°C to +150°C

Junction Temperature (Note 4)

150°C

Operating Ratings

(Note 1)

Supply Voltage

1.8V

24V

Junction Temperature Range

LM6132, LM6134

-40°C

+85°C

Thermal resistance (

)

N Package, 8-pin Molded DIP

115°C/W

M Package, 8-pin Surface Mount

193°C/W

N Package, 14-pin Molded DIP

81°C/W

M Package, 14-pin Surface Mount

126°C/W

5.0V DC Electrical Characteristics

Unless otherwise specified, all limits guaranteed for T

= 25°C, V

= 5.0V, V

= 0V, V

= V

/2 and R

1 M

to V

/2.

Boldface limits apply at the temperature extremes

Symbol

Parameter

Conditions

Typ

(Note 5)

LM6134AI

LM6134BI

Units

LM6132AI

LM6132BI

Limit

(Note 6)

Input Offset Voltage

0.25

2
4

6
8

max

TCV

Input Offset Voltage Average Drift

µV/C

Input Bias Current

110

140
300

180
350

max

Input Offset Current

3.4

30
50

max

Input Resistance, CM

104

CMRR

Common Mode Rejection Ratio

100

75
70

min

60
55

PSRR

Power Supply Rejection Ratio

2.5V

12V

78
75

min

Input Common-Mode Voltage
Range

-0.25

5.25

5.0

Large Signal Voltage Gain

= 10k

100

V/mV

min

Output Swing

100k Load

4.992

4.98
4.93

min

0.007

0.017
0.019

max

10k Load

4.952

4.94
4.85

min

0.032

0.07
0.09

max

5k Load

4.923

4.90
4.85

min

0.051

0.095

0.12

0.095

0.12

max

Output Short Circuit Current
LM6132

Sourcing

2
2

2
1

min

Sinking

3.5

1.8
1.8

1.8

min

LM6132/LM6134

www.national.com

5.0V DC Electrical Characteristics

(Continued)

Unless otherwise specified, all limits guaranteed for T

= 25°C, V

= 5.0V, V

= 0V, V

= V

/2 and R

1 M

to V

/2.

Boldface limits apply at the temperature extremes

Symbol

Parameter

Conditions

Typ

(Note 5)

LM6134AI

LM6134BI

Units

LM6132AI

LM6132BI

Limit

(Note 6)

Output Short Circuit Current
LM6134

Sourcing

1.6

2
1

min

Sinking

3.5

1.8
1.3

1.8

min

Supply Current

Per Amplifier

360

400
450

µA

max

5.0V AC Electrical Characteristics

Unless otherwise specified, all limits guaranteed for T

= 25°C, V

= 5.0V, V

= 0V, V

= V

/2 and R

1 M

to V

/2.

Boldface limits apply at the temperature extremes

Symbol

Parameter

Conditions

Typ

(Note 5)

LM6134AI

LM6134BI

Units

LM6132AI

LM6132BI

Limit

(Note 6)

Slew Rate

V/µs

1 k

min

GBW

Gain-Bandwidth Product

f = 20 kHz

7.4

MHz

min

Phase Margin

= 10k

deg

Gain Margin

= 10k

Input Referred Voltage Noise

f = 1 kHz

Input Referred Current Noise

f = 1 kHz

0.18

LM6132/LM6134

www.national.com

2.7V DC Electrical Characteristics

Unless otherwise specified, all limits guaranteed for T

= 25°C, V

= 2.7V, V

= 0V, V

= V

/2 and R

1 M

to V

/2.

Boldface limits apply at the temperature extreme

Symbol

Parameter

Conditions

Typ

(Note 5)

LM6134AI

LM6134BI

Units

LM6132AI

LM6132BI

Limit

(Note 6)

Input Offset Voltage

0.12

max

Input Bias Current

2.7V

Input Offset Current

2.8

Input Resistance

134

CMRR

Common Mode

2.7V

Rejection Ratio

PSRR

Power Supply

1.35V

12V

Rejection Ratio

Input Common-Mode

2.7

Voltage Range

Large Signal

= 10k

100

V/mV

Voltage Gain

Output Swing

= 100k

0.03

0.08

0.112

max

2.66

2.65

2.25

min

Supply Current

Per Amplifier

330

µA

2.7V AC Electrical Characteristics

Unless otherwise specified, all limits guaranteed for T

= 25°C, V

= 2.7V, V

= 0V, V

= V

/2 and R

1 M

to V

/2.

Symbol

Parameter

Conditions

Typ

(Note 5)

LM6134AI

LM6134BI

Units

LM6132AI

LM6132BI

Limit

(Note 6)

GBW

Gain-Bandwidth Product

= 10k, f = 20 kHz

MHz

Phase Margin

= 10k

deg

Gain Margin

LM6132/LM6134

www.national.com

24V DC Electrical Characteristics

Unless otherwise specified, all limits guaranteed for T

= 25°C, V

= 24V, V

= 0V, V

= V

/2 and R

1 M

to V

/2.

Boldface limits apply at the temperature extreme

Symbol

Parameter

Conditions

Typ

(Note 5)

LM6134AI

LM6134BI

Units

LM6132AI

LM6132BI

Limit

(Note 6)

Input Offset Voltage

1.7

max

Input Bias Current

24V

125

Input Offset Current

4.8

Input Resistance

210

CMRR

Common Mode

24V

Rejection Ratio

PSRR

Power Supply

2.7V

24V

Rejection Ratio

Input Common-Mode

-0.25

V min

Voltage Range

24.25

V max

Large Signal

= 10k

102

V/mV

Voltage Gain

Output Swing

= 10k

0.075

0.15

max

23.86

23.8

min

Supply Current

Per Amplifier

390

450

µA

490

max

24V AC Electrical Characteristics

Unless otherwise specified, all limits guaranteed for T

= 25°C, V

= 24V, V

= 0V, V

= V

/2 and R

1 M

to V

/2.

Symbol

Parameter

Conditions

Typ

(Note 5)

LM6134AI

LM6134BI

Units

LM6132AI

LM6132BI

Limit

(Note 6)

GBW

Gain-Bandwidth Product

= 10k, f = 20 kHz

MHz

Phase Margin

= 10k

deg

Gain Margin

= 10k

THD +
N

Total Harmonic

= +1, V

= 20V

P-P

0.0015

Distortion and Noise

f = 10 kHz

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is in-
tended 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 k

in series with 100 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.

Note 4: The maximum power dissipation is a function of T

J(max)

, and T

. The maximum allowable power dissipation at any ambient temperature is P

= (T

J(max)

- T

. All numbers apply for packages soldered directly into a PC board.

Note 5: Typical Values represent the most likely parametric norm.

Note 6: All limits are guaranteed by testing or statistical analysis.

LM6132/LM6134

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Typical Performance Characteristics

= 25°C, R

= 10 k

unless otherwise specified

Supply Current vs
Supply Voltage

DS012349-3

Offset Voltage vs
Supply Voltage

DS012349-5

vs V

DS012349-6

vs V

DS012349-7

vs V

DS012349-8

bias

vs V

DS012349-9

bias

vs V

DS012349-10

bias

vs V

DS012349-11

Input Bias Current vs
Supply Voltage

DS012349-12

Neg PSRR vs
Frequency

DS012349-13

Pos PSSR vs
Frequency

DS012349-14

Output Voltage

DS012349-15

LM6132/LM6134

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Typical Performance Characteristics

= 25°C, R

= 10 k

unless otherwise specified (Continued)

Output Voltage

DS012349-16

Output Voltage

DS012349-17

CMRR vs Frequency

DS012349-18

Output Voltage vs
Sinking Current

DS012349-19

Output Voltage vs
Sinking Current

DS012349-20

Output Voltage vs
Sinking Current

DS012349-21

Output Voltage vs
Sourcing Current

DS012349-22

Output Voltage vs
Sourcing Current

DS012349-23

Output Voltage vs
Sourcing Current

DS012349-24

LM6132/LM6134

www.national.com

Typical Performance Characteristics

= 25°C, R

= 10 k

unless otherwise specified (Continued)

LM6132/34 Application Hints

The LM6132 brings a new level of ease of use to opamp sys-
tem design.

With greater than rail-to-rail input voltage range concern
over exceeding the common-mode voltage range is elimi-
nated.

Rail-to-rail output swing provides the maximum possible dy-
namic range at the output. This is particularly important
when operating on low supply voltages.

The high gain-bandwidth with low supply current opens new
battery powered applications, where high power consump-
tion, previously reduced battery life to unacceptable levels.

To take advantage of these features, some ideas should be
kept in mind.

ENHANCED SLEW RATE

Unlike most bipolar opamps, the unique phase reversal
prevention/speed-up circuit in the input stage eliminates
phase reversal and allows the slew rate to be very much a
function of the input signal amplitude.

Figure 2 shows how excess input signal is routed around the
input collector-base junctions directly to the current mirrors.

The LM6132/34 input stage converts the input voltage
change to a current change. This current change drives the
current mirrors through the collectors of Q1Q2, Q3Q4
when the input levels are normal.

Noise Voltage vs
Frequency

DS012349-25

Noise Current vs
Frequency

DS012349-38

NF vs Source Resistance

DS012349-39

Gain and Phase vs
Frequency

DS012349-28

Gain and Phase vs
Frequency

DS012349-29

Gain and Phase vs
Frequency

DS012349-30

GBW vs Supply
Voltage at 20 kHz

DS012349-31

LM6132/LM6134

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LM6132/34 Application Hints

(Continued)

If the input signal exceeds the slew rate of the input stage
and the differential input voltage rises above a diode drop,
the excess signal bypasses the normal input transistors,
(Q1Q4), and is routed in correct phase through the two ad-
ditional transistors, (Q5, Q6), directly into the current mirrors.

This rerouting of excess signal allows the slew-rate to in-
crease by a factor of 10 to 1 or more. (See

Figure 1.)

As the overdrive increases, the opamp reacts better than a
conventional opamp. Large fast pulses will raise the slew-
rate to around 25V to 30V/µs.

This effect is most noticeable at higher supply voltages and
lower gains where incoming signals are likely to be large.

This speed-up action adds stability to the system when driv-
ing large capacitive loads.

DRIVING CAPACITIVE LOADS

Capacitive loads decrease the phase margin of all opamps.
This is caused by the output resistance of the amplifier and
the load capacitance forming an R-C phase lag network.
This can lead to overshoot, ringing and oscillation. Slew rate
limiting can also cause additional lag. Most opamps with a
fixed maximum slew-rate will lag further and further behind
when driving capacitive loads even though the differential in-
put voltage raises. With the LM6132, the lag causes the slew
rate to raise. The increased slew-rate keeps the output fol-
lowing the input much better. This effectively reduces phase
lag. After the output has caught up with the input, the differ-
ential input voltage drops down and the amplifier settles
rapidly.

These features allow the LM6132 to drive capacitive loads
as large as 500 pF at unity gain and not oscillate. The scope
photos (

Figure 3 and Figure 4) above show the LM6132 driv-

ing a 500 pF load. In

Figure 3 , the lower trace is with no ca-

pacitive load and the upper trace is with a 500 pF load. Here
we are operating on

12V supplies with a 20 Vp-p pulse. Ex-

Slew Rate vs Differential V

12V

DS012349-40

FIGURE 1.

DS012349-36

FIGURE 2.

LM6132/LM6134

www.national.com

LM6132/34 Application Hints

(Continued)

cellent response is obtained with a C

of 39 pF. In

Figure 4,

the supplies have been reduced to

2.5V, the pulse is

4 Vp-p and C

is 39 pF. The best value for the compensation

capacitor should be established after the board layout is fin-
ished because the value is dependent on board stray capac-
ity, the value of the feedback resistor, the closed loop gain
and, to some extent, the supply voltage.

Another effect that is common to all opamps is the phase
shift caused by the feedback resistor and the input capaci-
tance. This phase shift also reduces phase margin. This ef-
fect is taken care of at the same time as the effect of the ca-
pacitive load when the capacitor is placed across the
feedback resistor.

The circuit shown in

Figure 5 was used for these scope

photos.

Figure 6 shows a method for compensating for load capaci-
tance (C

) effects by adding both an isolation resistor Ro at

the output and a feedback capacitor C

directly between the

output and the inverting input pin. Feedback capacitor C

compensates for the pole introduced by R

and C

, minimiz-

ing ringing in the output waveform while the feedback resis-
tor R

compensates for dc inaccuracies introduced by R

Depending on the size of the load capacitance, the value of
R

is typically chosen to be between 100

to 1 k

Typical Applications

3 OPAMP INSTRUMENTATION AMP WITH
RAIL-TO-RAIL INPUT AND OUTPUT

Using the LM6134, a 3 opamp instrumentation amplifier with
rail-to-rail inputs and rail to rail output can be made. These
features make these instrumentation amplifiers ideal for
single supply systems.

Some manufacturers use a precision voltage divider array of
5 resistors to divide the common-mode voltage to get an in-
put range of rail-to-rail or greater. The problem with this
method is that it also divides the signal, so to even get unity
gain, the amplifier must be run at high closed loop gains.
This raises the noise and drift by the internal gain factor and
lowers the input impedance. Any mismatch in these preci-
sion resistors reduces the CMR as well. Using the LM6134,
all of these problems are eliminated.

In this example, amplifiers A and B act as buffers to the dif-
ferential stage (

Figure 7). These buffers assure that the input

impedance is over 100 M

and they eliminate the require-

ment for precision matched resistors in the input stage. They
also assure that the difference amp is driven from a voltage
source. This is necessary to maintain the CMR set by the
matching of R1R2 with R3R4.

DS012349-45

FIGURE 3.

DS012349-42

FIGURE 4.

DS012349-43

FIGURE 5.

DS012349-37

FIGURE 6.

LM6132/LM6134

www.national.com

Typical Applications

(Continued)

FLAT PANEL DISPLAY BUFFERING

Three features of the LM6132/34 make it a superb choice for
TFT LCD applications. First, its low current draw (360 µA per
amplifier

5V) makes it an ideal choice for battery powered

applications such as in laptop computers. Second, since the
device operates down to 2.7V, it is a natural choice for next
generation 3V TFT panels. Last, but not least, the large ca-
pacitive drive capability of the LM6132 comes in very handy
in driving highly capacitive loads that are characteristic of
LCD display drivers.

The large capacitive drive capability of the LM6132/34 al-
lows it to be used as buffers for the gamma correction refer-
ence voltage inputs of resistor-DAC type column (Source)
drivers in TFT LCD panels. This amplifier is also useful for
buffering only the center reference voltage input of
Capacitor-DAC type column (Source) drivers such as the
LMC750X series.

Since for VGA and SVGA displays, the buffered voltages
must settle within approximately 4 µs, the well known tech-
nique of using a small isolation resistor in series with the am-
plifier's output very effectively dampens the ringing at the
output.

With its wide supply voltage range of 2.7V to 24V), the
LM6132/34 can be used for a diverse range of applications.
The system designer is thus able to choose a single device
type that serves many sub-circuits in the system, eliminating
the need to specify multiple devices in the bill of materials.
Along with its sister parts, the LM6142 and LM6152 that
have the same wide supply voltage capability, choice of the
LM6132 in a design eliminates the need to search for mul-
tiple sources for new designs.

DS012349-44

FIGURE 7.

LM6132/LM6134

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Notes

LIFE SUPPORT POLICY

NATIONAL'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:

1. Life support devices or systems are devices or

systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.

2. A critical component is any component of a life

support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.

National Semiconductor
Corporation
Americas
Tel: 1-800-272-9959
Fax: 1-800-737-7018
Email: support@nsc.com

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Email: ap.support@nsc.com

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Japan Ltd.
Tel: 81-3-5639-7560
Fax: 81-3-5639-7507

www.national.com

LM6132

Dual

and

LM6134

Quad,

Low

Power

MHz

Rail-to-Rail

I/O

Operational

Amplifiers

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.

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