TEXAS INSTRUMENTS INA157 Technical data

®

For most current data sheet and other product

information, visit www.burr-brown.com

High-Speed, Precision

DIFFERENCE AMPLIFIER

INA157

INA157

FEATURES

● DESIGNED FOR LOW COST

● LOW OFFSET VOLTAGE: ±500µV max

● LOW OFFSET DRIFT: ±2µV/°C

● LOW GAIN ERROR: ±0.05% max

● WIDE BANDWIDTH: 3MHz

● HIGH SLEW RATE: 14V/µs

● FAST SETTLING TIME: 3µs to 0.01%

● WIDE SUPPLY RANGE: ±4V to ±18V

● LOW QUIESCENT CURRENT: 2.4mA

● SO-8 SURFACE-MOUNT PACKAGE

DESCRIPTION

The INA157 is a high slew rate, G = 1/2 or G = 2
difference amplifier consisting of a precision op amp
with a precision resistor network. The on-chip resis­tors are laser trimmed for accurate gain and high
common-mode rejection. Excellent TCR tracking of
the resistors maintains gain accuracy and common­mode rejection over temperature. The input common­mode voltage range extends beyond the positive and
negative supply rails. It operates on ±4V to ±18V
supplies.

The difference amplifier is the foundation of many
commonly used circuits. The INA157 provides this
circuit function without using an expensive precision
resistor network. The INA157 is available in a SO-8
surface-mount package and is specified for operation
over the extended industrial temperature range, –40°C
to +85°C.

APPLICATIONS

● DIFFERENTIAL INPUT AMPLIFIER

● INSTRUMENTATION AMPLIFIER

BUILDING BLOCK

● G = 1/2 AMPLIFIER

● G = 2 AMPLIFIER

● DIFFERENTIAL CURRENT RECEIVER

● VOLTAGE-CONTROLLED CURRENT SOURCE

● GROUND LOOP ELIMINATOR

● CURRENT SHUNT MONITOR

V+

7

V–

6kΩ12kΩ

6kΩ12kΩ

4

5

Sense

6

Output

1

Ref

–In

+In

2

3

SBOS105

International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: [phone]

Twx: 910-952-1111 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: [phone] • Immediate Product Info: [phone]

©1999 Burr-Brown Corporation PDS-1483B Printed in U.S.A. March, 1999

SPECIFICATIONS: VS = ±15V

At TA = +25°C, VS = ±15V, RL = 2kΩ connected to ground, and reference pin connected to ground, unless otherwise noted.

INA157U INA157UA
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
OFFSET VOLTAGE

(1)

Initial

vs Temperature ±2 ±20 ✽✽µV/°C
vs Power Supply V
vs Time 0.25 ✽ µV/mo

INPUT IMPEDANCE

Differential 24 ✽ kΩ
Common-Mode 18 ✽ kΩ

INPUT VOLTAGE RANGE

Common-Mode Voltage Range

Positive VO = 0V 3(V+)–7.5 3(V+)–6 ✽✽ V
Negative VO = 0V 3(V–)+7.5 3(V–)+3 ✽✽ V

Common-Mode Rejection Ratio

OUTPUT VOLTAGE NOISE

f = 0.1Hz to 10Hz 1.3 ✽ µVp-p
f = 1kHz 26 ✽ nV/√Hz

GAIN

Initial 0.5 ✽ V/V
Error V

vs Temperature ±1 ±10 ✽✽ppm/°C

Nonlinearity VO = –10V to +10V ±0.0001 ±0.001 ✽ ±0.002 % of FS

OUTPUT

Voltage, Positive (V+)–2 (V+)–1.8 ✽✽ V

Negative (V–)+2 (V–)+1.6 ✽✽ V
Current Limit, Continuous to Common ±60 ✽ mA
Capacitive Load (stable operation) 500 ✽ pF

FREQUENCY RESPONSE

Small-Signal Bandwidth –3dB 4 ✽ MHz
Slew Rate 14 ✽ V/µs
Settling Time: 0.1% 10V Step, C

Overload Recovery Time 50% Overdrive 3 ✽ µs

POWER SUPPLY

Rated Voltage ±15 ✽ V
Operating Voltage Range ±4 ±18 ✽✽V
Quiescent Current IO = 0mA ±2.4 ±2.9 ✽✽mA

TEMPERATURE RANGE

Specified –40 +85 ✽✽°C
Operation –55 +125 ✽✽°C
Storage –55 +125 ✽✽°C
Thermal Resistance,

SO-8 Surface-Mount 150 ✽ °C/W

✽Specifications the same as INA157U.
NOTES: (1) Includes effects of amplifier’s input bias and offset currents. (2) Internal resistors are ratio matched but have ±20% absolute value. (3) Includes effects

of amplifier’s input current noise and thermal noise contribution of resistor network.

(1)

RTO

±100 ±500 ✽ ±1000 µV

= ±4V to ±18V ±5 ±60 ✽✽µV/V

S

(2)

(3)

RTO

= –10V to +10V ±0.01 ±0.05 ✽ ±0.1 %

O

= 100pF 2 ✽ µs

L

VCM = –37.5V to 37.5V, RS = 0Ω

86 96 80 ✽ dB

0.01% 10V Step, CL = 100pF 3 ✽ µs

Θ

JA

The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.

®

INA157

2

PIN CONFIGURATION

ABSOLUTE MAXIMUM RATINGS

(1)

TOP VIEW SO-8

Ref

–In

+In

V–

1

2

3

4

NC = No Connection

NC

8

V+

7

Output

6

Sense

5

Supply Voltage, V+ to V–.................................................................... 40V

Input Voltage Range .......................................................................... ±80V

Output Short Circuit (to ground) ............................................. Continuous

Operating Temperature ..................................................–55°C to +125°C

Storage Temperature ..................................................... –55°C to +125°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.

ELECTROSTATIC
DISCHARGE SENSITIVITY

This integrated circuit can be damaged by ESD. Burr-Brown
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.

PACKAGE/ORDERING INFORMATION

PACKAGE SPECIFIED
DRAWING TEMPERATURE PACKAGE ORDERING TRANSPORT

PRODUCT PACKAGE NUMBER

INA157U SO-8 Surface-Mount 182 –40°C to +85°C INA157U INA157U Rails

(1)

RANGE MARKING NUMBER

"""""INA157U/2K5 Tape and Reel

INA157UA SO-8 Surface-Mount 182 –40°C to +85°C INA157UA INA157UA Rails

"""""INA157UA/2K5 Tape and Reel

NOTES: (1) For detailed drawing and dimension table, please see end of data sheet, or Appendix C of Burr-Brown IC Data Book. (2) Models with a slash (/ ) are
available only in Tape and Reel in the quantities indicated (e.g., /2K5 indicates 2500 devices per reel). Ordering 2500 pieces of “INA157U/2K5” will get a single
2500-piece Tape and Reel. For detailed Tape and Reel mechanical information, refer to Appendix B of Burr-Brown IC Data Book.

(2)

MEDIA

®

3

INA157

TYPICAL PERFORMANCE CURVES

MAXIMUM OUTPUT VOLTAGE vs FREQUENCY

Frequency (Hz)

Output Voltage (Vp-p)

100 1k 10k 100k 1M 10M

40

30

20

10

0

At TA = +25°C, VS = ±15V, and G = 1/2, unless otherwise noted.

10

0

–10

Voltage Gain (dB)

–20

–30

1k 10k 100k 1M 10M

POWER SUPPLY REJECTION RATIO vs FREQUENCY

120

100

80

60

GAIN vs FREQUENCY

Frequency (Hz)

–PSRR

RTO

COMMON-MODE REJECTION RATIO vs FREQUENCY

100

80

60

RTO

Common-Mode Rejection Ratio (dB)

40

1k 10k 100k 1M

Frequency (Hz)

40

20

Power Supply Rejection (dB)

0

100 1k 10k 100k 1M

INPUT COMMON-MODE VOLTAGE

80
60
40
20

0
–20
–40

Common-Mode Voltage (V)

V

–60
–80

= 0V

REF

= 2kΩ

R

L

–20 –15 –10 –5 0 5 10 15 20

vs OUTPUT VOLTAGE

+PSRR

Frequency (Hz)

Output Voltage (V)

G = 1/2

= ±15V

V

S

TOTAL HARMONIC DISTORTION + NOISE

0.1

0.010

0.001

THD+Noise (%)

0.0001
20 100 1k 10k 20k

vs FREQUENCY

Frequency (Hz)

VO = 5Vrms

RL = 100kΩ

RL = 2kΩ

RL = 600Ω

®

INA157

4

TYPICAL PERFORMANCE CURVES (CONT)

SLEW RATE vs TEMPERATURE

Temperature (°C)

Slew Rate (V/µs)

–75 –50 –25 0 25 50 75 100

+SR

125

16

14

12

10

8

–SR

OUTPUT NOISE VOLTAGE

vs NOISE BANDWIDTH

Frequency (Hz)

Noise Voltage (µVrms)

1 10 100 1k 10k 100k

100

10

1

0.1

At TA = +25°C, VS = ±15V, and G = 1/2, unless otherwise noted.

4

3

2

1

Quiescent Current (mA)

0

80
60
40
20

0
–20
–40

Short-Circuit Current (mA)

–60
–80

QUIESCENT CURRENT vs TEMPERATURE

–75 –50 –25 0 25 50 75 100 125

Temperature (°C)

SHORT-CIRCUIT CURRENT vs TEMPERATURE

+I

SC

–I

SC

–75 –50 –25 0 25 50 75 100 125

Temperature (°C)

OUTPUT VOLTAGE SWING vs OUTPUT CURRENT

14
13
12
11
10

9

–9
–10
–11

Output Voltage Swing (V)

–12
–13
–14

125°C

85°C

125°C

0 ±20 ±40 ±60 ±80

Output Current (mA)

–55°C

25°C

85°C

25°C

–55°C

OUTPUT VOLTAGE NOISE SPECTRAL DENSITY

10k

1k

100

Voltage Noise (nV/√Hz)

10

1 10 100 1k 10k 100k 1M

vs FREQUENCY

Frequency (Hz)

®

5

INA157

TYPICAL PERFORMANCE CURVES (CONT)

At TA = +25°C, VS = ±15V, and G = 1/2, unless otherwise noted.

35

30

25

20

15

10

Percent of Units (%)

5

0

–900

–800

–700

–1000

SMALL-SIGNAL STEP RESPONSE

OFFSET VOLTAGE

PRODUCTION DISTRIBUTION

Typical Production

0

100

200

–600

–500

–400

Offset Voltage (µV)

CL = 100pF

–300

–200

–100

300

Distribution of

Packaged Units.

400

500

600

700

800

900

1000

OFFSET VOLTAGE DRIFT

25

20

15

10

Percent of Units (%)

5

0

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

PRODUCTION DISTRIBUTION

Typical production distribution

of packaged units.

Offset Voltage Drift (µV/°C)

LARGE-SIGNAL STEP RESPONSE

CL = 500pF

50mV/div

= 500pF

C

L

1µs/div

5V/div

SMALL-SIGNAL OVERSHOOT

70

60

50

40

30

Overshoot (%)

20

10

0

0 200 400 600 800 1000 1200

vs LOAD CAPACITANCE

RL = 2kΩ

100mV Step

Load Capacitance (pF)

1µs/div

®

INA157

6

APPLICATIONS INFORMATION

The INA157 is a difference amplifier suitable for a wide
range of general-purpose applications. Figure 1 shows the
basic G = 1/2 configuration. The input and feedback resis­tors can be reversed to achieve G = 2, as shown in Figure 2.
For applications requiring G = 1, the INA154 is recom­mended.

Decoupling capacitors are strongly recommended for appli­cations with noisy or high impedance power supplies. The
capacitors should be placed close to the device pins as
shown in Figure 1.

As shown in Figure 1, the output is referred to the reference
terminal (pin 1). A voltage applied to this pin will be
summed with the output signal. The differential input signal
is connected to pins 2 and 3. The source impedances con­nected to the inputs must be nearly equal to assure good
common-mode rejection. A 5Ω mismatch in source imped­ance will degrade the common-mode rejection of a typical
device to approximately 77dB (RTO). If the source has a
known impedance mismatch, an additional resistor in series
with the opposite input can be used to preserve good com­mon-mode rejection.

V–

1µF

4

INA157

R

1

–In

V

2

+In

V

3

12kΩ

2

R

3

12kΩ

3

6kΩ

1

Ref

V+

1µF

7

R

2

6kΩ

R

4

5

6

R

L

= 1/2 (V3 – V2)

V

O

FIGURE 1. G = 1/2 Differential Amplifier (basic power

supply and signal connections).

FIGURE 2. G = 2 Differential Amplifier.

G = 1/2

V

2

V

3

20Ω

2

3

INA157

R

6kΩ

4

5

6

V

O

V
Offset Adjustment
Range = ±1mV

7

= 1/2 (V3 – V2)

O

250kΩ

10Ω

®

INA157

INA157

6kΩ

2

12kΩ

5

–In

2

INA157

BUF634 inside feedback
loop contributes no error.

5

6

6kΩ

1

V

1

12kΩ

V

2

3

V0 = 2V1 + V

FIGURE 4. Precision Summing Amplifier.

V

1

–In

A

1

R

R

1

R

A

V

+In

The INA157 can be combined with op amps to form a complete instru­mentation amplifier with specialized performance characteristics. Burr­Brown offers many complete high performance IAs. Products with related
performances are shown at the right.

A

OPA227 Low Noise INA103
OPA129 Ultra Low Bias Current (fA) INA116
OPA277 Low Offset Drift, Low Noise INA114, INA128
OPA2134 FET Input (pA) INA111, INA121

2

2

, A

1

2

2

2

2

3

VO = (1 + 2R2/R1) (V2 –V1)

FEATURE BURR-BROWN IAs

INA157

5

6

1

SIMILIAR COMPLETE

FIGURE 5. Precision Instrumentation Amplifier.

6

1

BUF634

(Low IQ mode)

2

3

+In

V

O

R

L

FIGURE 6. Boosting Output Current.

The difference amplifier is a highly versatile building
block that is useful in a wide variety of applications. See
the INA105 data sheet for additional applications ideas,
including:

• Current Receiver with Compliance to Rails

• ±10V Precision Voltage Reference

• ±5V Precision Voltage Reference

V

O

• Precision Average Value Amplifier

• Precision Bipolar Offsetting

• Precision Summing Amplifier with Gain

• Instrumentation Amplifier Guard Drive Generator

• Precision Summing Instrumentation Amplifier

• Precision Absolute Value Buffer

• Precision Voltage-to-Current Converter with Differential
Inputs

• Differential Input Voltage-to-Current Converter for Low
I

OUT

• Isolating Current Source

• Differential Output Difference Amplifier

• Isolating Current Source with Buffering Amplifier for
Greater Accuracy

• Window Comparator with Window Span and Window
Center Inputs

• Precision Voltage-Controlled Current Source with Buff­ered Differential Inputs and Gain

• Digitally Controlled Gain of ±1 Amplifier

®

INA157

8

PACKAGE OPTION ADDENDUM

www.ti.com

11-Jul-2008

PACKAGING INFORMATION

Orderable Device Status

(1)

Package

Type

Package
Drawing

Pins Package

Qty

Eco Plan

INA157U ACTIVE SOIC D 8 100 Green (RoHS &

no Sb/Br)

INA157U/2K5 ACTIVE SOIC D 8 2500 Green (RoHS &

no Sb/Br)

INA157U/2K5E4 ACTIVE SOIC D 8 2500 Green (RoHS &

no Sb/Br)

INA157UA ACTIVE SOIC D 8 100 Green (RoHS &

no Sb/Br)

INA157UA/2K5 ACTIVE SOIC D 8 2500 Green (RoHS &

no Sb/Br)

INA157UA/2K5G4 ACTIVE SOIC D 8 2500 Green (RoHS &

no Sb/Br)

INA157UAG4 ACTIVE SOIC D 8 100 Green (RoHS &

no Sb/Br)

INA157UG4 ACTIVE SOIC D 8 100 Green (RoHS &

no Sb/Br)

(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)

Lead/Ball Finish MSL Peak Temp

CU NIPDAU Level-3-260C-168 HR

CU NIPDAU Level-3-260C-168 HR

CU NIPDAU Level-3-260C-168 HR

CU NIPDAU Level-3-260C-168 HR

CU NIPDAU Level-3-260C-168 HR

CU NIPDAU Level-3-260C-168 HR

CU NIPDAU Level-3-260C-168 HR

CU NIPDAU Level-3-260C-168 HR

(3)

(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.

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.

Addendum-Page 1

PACKAGE MATERIALS INFORMATION

www.ti.com

TAPE AND REEL INFORMATION

11-Mar-2008

*All dimensions are nominal

Device Package

INA157U/2K5 SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1

INA157UA/2K5 SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1

Type

Package
Drawing

Pins SPQ Reel

Diameter

(mm)

Reel

Width

W1 (mm)

A0 (mm) B0 (mm) K0 (mm) P1

(mm)W(mm)

Pin1

Quadrant

Pack Materials-Page 1

PACKAGE MATERIALS INFORMATION

www.ti.com

11-Mar-2008

*All dimensions are nominal

Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)

INA157U/2K5 SOIC D 8 2500 346.0 346.0 29.0

INA157UA/2K5 SOIC D 8 2500 346.0 346.0 29.0

Pack Materials-Page 2

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