TEXAS INSTRUMENTS INA157 Technical data

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High-Speed, Precision

DIFFERENCE AMPLIFIER

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+

V–

6kΩ12kΩ

Sense

Output

Ref

–In

+In

SBOS105

International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111

Twx: 910-952-1111 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132

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

(2)

(3)

RTO

= –10V to +10V ±0.01 ±0.05 ✽ ±0.1 %

= 100pF 2 ✽ µs

VCM = –37.5V to 37.5V, RS = 0Ω

86 96 80 ✽ dB

0.01% 10V Step, CL = 100pF 3 ✽ µs

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

PIN CONFIGURATION

ABSOLUTE MAXIMUM RATINGS

(1)

TOP VIEW SO-8

Ref

–In

+In

V–

NC = No Connection

V+

Output

Sense

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

INA157

TYPICAL PERFORMANCE CURVES

MAXIMUM OUTPUT VOLTAGE vs FREQUENCY

Frequency (Hz)

Output Voltage (Vp-p)

100 1k 10k 100k 1M 10M

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

–10

Voltage Gain (dB)

–20

–30

1k 10k 100k 1M 10M

POWER SUPPLY REJECTION RATIO vs FREQUENCY

120

100

GAIN vs FREQUENCY

Frequency (Hz)

–PSRR

RTO

COMMON-MODE REJECTION RATIO vs FREQUENCY

100

RTO

Common-Mode Rejection Ratio (dB)

1k 10k 100k 1M

Frequency (Hz)

Power Supply Rejection (dB)

100 1k 10k 100k 1M

INPUT COMMON-MODE VOLTAGE

80 60 40 20

0 –20 –40

Common-Mode Voltage (V)

–60 –80

= 0V

REF

= 2kΩ

–20 –15 –10 –5 0 5 10 15 20

vs OUTPUT VOLTAGE

+PSRR

Frequency (Hz)

Output Voltage (V)

G = 1/2

= ±15V

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

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