Datasheet ina128

®

INA1

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INA1

29

INA1

28

INA1

INA128 INA129

29

Precision, Low Power INSTRUMENTATION AMPLIFIERS
FEATURES
q LOW OFFSET VOLTAGE: 50µV max q LOW DRIFT: 0.5µV/°C max q LOW INPUT BIAS CURRENT: 5nA max q HIGH CMR: 120dB min q INPUTS PROTECTED TO ±40V q WIDE SUPPLY RANGE: ±2.25 to ±18V q LOW QUIESCENT CURRENT: 700µA q 8-PIN PLASTIC DIP, SO-8

DESCRIPTION
The INA128 andINA129 are low power, general purpose instrumentation amplifiers offering excellent accuracy. Their versatile 3-op amp design and small size make them ideal for a wide range of applications. Current-feedback input circuitry provides wide bandwidth even at high gain (200kHz at G = 100). A single external resistor sets any gain from 1 to 10,000. INA128 provides an industry standard gain equation;INA129’s gain equation is compatible with the AD620. The INA128/INA129 is laser trimmed for very low offset voltage (50µV), drift (0.5µV/°C) and high common-mode rejection (120dB at G ≥ 100). It operates with power supplies as low as ±2.25V, and quiescent current is only 700µA—ideal for battery operated systems. Internal input protection can withstand up to ±40V without damage. The INA128/INA129 isavailable in 8-pin plastic DIP, and SO-8 surface-mount packages, specified for the –40°C to +85°C temperature range. The INA128 is also available in dual configuration, the INA2128.
V+ 7 INA128: G=1+ 50kΩ RG

APPLICATIONS
q BRIDGE AMPLIFIER q THERMOCOUPLE AMPLIFIER q RTD SENSOR AMPLIFIER q MEDICAL INSTRUMENTATION q DATA ACQUISITION

VIN

–

2

INA128, INA129 Over-Voltage Protection A140kΩ 25kΩ(1) 40kΩ

INA129: G=1+ 6 49.4kΩ RG

1

RG 8 25kΩ(1) A2 40kΩ 4 V–

A3

VO

5 40kΩ

+ VIN

3

Over-Voltage Protection

Ref

NOTE: (1) INA129: 24.7kΩ

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/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132

©1995 Burr-Brown Corporation

PDS-1296C

Printed in U.S.A. October, 1996

SBOS051

SPECIFICATIONS
At TA = +25°C, VS = ±15V, RL = 10kΩ, unless otherwise noted. INA128P, U INA129P, U PARAMETER CONDITIONS MIN TYP MAX MIN INA128PA, UA INA129PA,UA TYP MAX UNITS

INPUT Offset Voltage, RTI Initial TA = +25°C vs Temperature TA = TMIN to TMAX vs Power Supply VS = ±2.25V to ±18V Long-Term Stability Impedance, Differential Common-Mode VO = 0V Common-Mode Voltage Range(1) Safe Input Voltage Common-Mode Rejection VCM = ±13V, ∆RS = 1kΩ G=1 G=10 G=100 G=1000

(V+) – 2 (V–) + 2

±10 ±100/G ±0.2 ± 2/G ±0.2 ±20/G ±0.1 ±3/G 1010 || 2 1011 || 9(V+) – 1.4 (V–) + 1.7

±50 ±500/G ±0.5 ± 20/G ±1 ±100/G

T T ±40 73 93 110 110 ±5 ±5

±25 ±100/G ±125 ±1000/G ±0.2 ± 5/G ±1 ± 20/G T ±2 ±200/G T T T T T T T T T T T T T T T T T T T T T T T ±10 ±10

µV µV/°C µV/V µV/mo Ω || pF Ω || pF V V V dB dB dB dB nA pA/°C nA pA/°C nV/√Hz nV/√Hz nV/√Hz µVp-p pA/√Hz pA/√Hz pAp-p V/V V/V V/V % % % % ppm/°C ppm/°C % of FSR % of FSR % of FSR % of FSR V VpF mA MHz kHz kHz kHz V/µs µs µs µs µs µs

80 100 120 120

86 106 125 130 ±2 ±30 ±1 ±30

BIAS CURRENT vs Temperature Offset Current vs Temperature NOISE VOLTAGE, RTI f = 10Hz f = 100Hz f = 1kHz fB = 0.1Hz to 10Hz Noise Current f=10Hz f=1kHz fB = 0.1Hz to 10Hz GAIN Gain Equation, INA128 INA129 Range of Gain Gain Error G = 1000, RS = 0Ω

10 8 8 0.2 0.9 0.3 30 1 + (50kΩ/RG) 1 + (49.4kΩ/RG) 1G=1 G=10 G=100 G=1000 G=1 VO = ±13.6V, G=1 G=10 G=100 G=1000 RL = 10kΩ RL = 10kΩ (V+) – 1.4 (V–) + 1.4 ±0.01 ±0.02 ±0.05 ±0.5 ±1 ±25 ±0.0001 ±0.0003 ±0.0005 ±0.001 (V+) – 0.9 (V–) + 0.8 1000 +6/–15 1.3 700 200 20 4 7 7 9 80 4 ±2.25 VIN = 0V –40 –40 80 150 ±15 ±700 ±18 ±750 85 125 T 10000 ±0.024 ±0.4 ±0.5 ±1 ±10 ±100 ±0.001 ±0.002 ±0.002 (Note 4)

T T T T T T T T T T T T T T T T T T T T T T T T...