Precision, Low Power Instrumentation Amplifiers - INA128

INA128 (ACTIVE)

Precision, Low Power Instrumentation Amplifiers

Recommended alternative parts

  • INA129  -  Identical performance with different gain equation.
  • INA131  -  Improve input offset

Description

The INA128 and INA129 are low power, general purpose instrumentation amplifiers offering excellent accuracy. The 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. The INA128 provides an industry-standard gain equation; the INA129 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 is available in 8-pin plastic DIP and SO-8 surface-mount packages, specified for the –C40°C to +85°C temperature range. The INA128 is also available in a dual configuration, the INA2128.

Features

  • LOW OFFSET VOLTAGE: 50µV max
  • LOW DRIFT: 0.5µV/°C max
  • LOW INPUT BIAS CURRENT: 5nA max
  • HIGH CMR: 120dB min
  • INPUTS PROTECTED TO ±40V
  • WIDE SUPPLY RANGE: ±2.25V to ±18V
  • LOW QUIESCENT CURRENT: 700µA
  • 8-PIN PLASTIC DIP, SO-8
  • APPLICATIONS
    • BRIDGE AMPLIFIER
    • THERMOCOUPLE AMPLIFIER
    • RTD SENSOR AMPLIFIER
    • MEDICAL INSTRUMENTATION
    • DATA ACQUISITION

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Parametrics Compare all products in Dual Supply

 
Number of Channels (#)
Vs (Min) (V)
Vs (Max) (V)
Input Bias Current (+/-) (Max) (nA)
Input Offset Drift (+/-) (Max) (uV/Degrees Celsius)
Noise at 1kHz (Typ) (nV/rt(Hz))
CMRR (Min) (dB)
Non-Linearity (+/-) (Max) (%)
Bandwidth at G=100 (Min) (kHz)
Iq (Typ) (mA)
Gain (V/V)
Output Offset (+/-) (Max) (uV)
Output Offset Drift (+/-) (Max) (uV/Degrees Celsius)
Input Offset (+/-) (Max) (uV)
Rating
Operating Temperature Range (C)
Pin/Package
INA128 INA129
1     1    
4.5     4.5    
36     36    
5     5    
0.5     0.5    
8     8    
120     120    
0.012     0.002    
200     200    
0.7     0.7    
1 to 10000     1 to 10000    
  500/G    
20/G     20/G    
250     50    
Military     Military    
-40 to 125     -40 to 125    
8PDIP
8SOIC    
8PDIP
8SOIC    

Other qualified versions of INA128

Version Part Number Definition
High-Temperature INA128-HT High-Temperature product for harsh environments

Featured tools and software

Companion parts

Part # Name Product Family Comments
OPA130   Low Power, Precision FET-Input Operational Amplifiers   OPERATIONAL AMPLIFIER - PRECISION AMPLIFIER    Use for AC-Coupling
See Literature sbos051b  
TPS7A3001   Vin -3V to -36V, -200mA, Ultra-Low Noise, High PSRR, Low-Dropout Linear Regulator   LINEAR REGULATOR (LDO) - SINGLE CHANNEL LDO    The negative-voltage TPS7A3001 LDO, when paired with the positive voltage TPS7A4901 LDO, provides designers with a total solution for powering precision analog applications. These LDOs feature ultra-high PSRR performance with output noise as low as 16 �Vrms and are designed to power noise-sensitive applications. Please look at ti.com/pmp5863.
See Literature slvt170  See Literature SLVT170, Power management for Precision Analog  
OPA177   Precision Operational Amplifier   OPERATIONAL AMPLIFIER - PRECISION AMPLIFIER    Also use for offset trimming circuitry
See Literature sbos051b  
TPS7A4901   Vin 3V to 36V, 150mA, Ultra-Low Noise, High PSRR, Low-Dropout Linear Regulator   LINEAR REGULATOR (LDO) - SINGLE CHANNEL LDO    The negative-voltage TPS7A3001 LDO, when paired with the positive voltage TPS7A4901 LDO, provides designers with a total solution for powering precision analog applications. These LDOs feature ultra-high PSRR performance with output noise as low as 16 �Vrms and are designed to power noise-sensitive applications. Please look at ti.com/pmp5863.
See Literature slvt170  See Literature SLVT170, Power management for Precision Analog  
REF200   Dual Current Source/Current Sink   VOLTAGE REFERENCE - CURRENT REFERENCE    Also use for offset trimming circuitry
See Literature sbos051b  
REF102   Precision Voltage Reference   VOLTAGE REFERENCE - SERIES VOLTAGE REFERENCE    Use in resistive temperature device (RTD) application
See Literature sbos051b  
OPA2131   General Purpose FET-Input Operational Amplifiers   OPERATIONAL AMPLIFIER - PRECISION AMPLIFIER    Use in electro cardiogram circuits
See Literature sbos051b  
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