INA828 Precision Instrumentation Amplifiers

INA828 Precision Instrumentation Amplifiers

Texas Instruments' INA828 are high-precision instrumentation amplifiers that offer low power consumption and operate over a very wide single- or dual-supply range. A single external resistor sets any gain from 1 to 1000. The devices offer excellent precision due to the use of new super-beta input transistors which provide exceptionally low input offset voltage, offset voltage drift, input bias current, and input voltage and current noise. Additional circuitry protects the inputs against overvoltage up to ±40 V.

The INA828 are optimized to provide excellent common-mode rejection ratio. At G = 1, the common-mode rejection ratio exceeds 90 dB across the full input common-mode range. The devices are well-suited for low-voltage operation from a 5 V single supply as well as dual supplies up to ±18 V. Finally, the INA828 are available in an 8-pin SOIC package and specified over the -40°C to +125°C temperature range.

Features
  • Precision instrumentation amplifier evolution:
    • Second generation: INA828
    • First generation: INA128
  • Low offset voltage: 50 µV, max.
  • Gain drift: 5 ppm/°C (G = 1), 50 ppm/°C (G > 1)
  • Noise: 7 nV/√Hz
  • Bandwidth: 2 MHz (G = 1), 260 kHz (G = 100)
  • Common-mode rejection:
    • 110 dB, min. (G = 10)
  • Stable with 1 nF capacitive loads
  • Inputs protected up to ±40 V
  • Power-supply rejection: 100 dB, min. (G = 1)
  • Supply current: 650 µA, max.
  • Supply range:
    • Single supply: 4.5 V to 36 V
    • Dual supply: ±2.25 V to ±18 V
  • Specified temperature range: -40°C to +125°C
  • Package: 8-pin SOIC
Applications
  • Industrial process controls
  • Circuit breakers
  • Battery testers
  • ECG amplifiers
  • Power automation
  • Medical instrumentation
  • Portable instrumentation

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