INA821 35-μV offset, 7-nV/√Hz noise, low-power, precision instrumentation amplifier | TI.com

INA821 (ACTIVE)

35-μV offset, 7-nV/√Hz noise, low-power, precision instrumentation amplifier

 

Description

The INA821 is a high-precision instrumentation amplifier that offers low power consumption and operates over a wide single- or dual-supply range. A single external resistor sets any gain from 1 to 10,000. The device has high precision as a result of super-beta input transistors, which provide 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 INA821 is optimized to provide a high common-mode rejection ratio. At G = 1, the common-mode rejection ratio exceeds 92 dB across the full input common-mode range. The device is designed for low-voltage operation from a 4.5-V single supply and dual supplies up to ±18 V. The INA821 is available in an 8-pin SOIC package and specified over the –40°C to +125°C temperature range.

Features

  • Low Offset Voltage: 10µV (Typical), 35 µV (Maximum)
  • Gain Drift: 5 ppm/°C (G = 1), 35 ppm/°C (G > 1) (Maximum)
  • Noise: 7 nV/√Hz
  • Bandwidth: 4.7 MHz (G = 1), 290 kHz (G = 100)
  • Stable With 1-nF Capacitive Loads
  • Inputs Protected Up to ±40 V
  • Common-Mode Rejection: 112 dB, G = 10 (Minimum)
  • Power Supply Rejection: 114 dB, G = 1 (Minimum)
  • Supply Current: 650 µA (Maximum)
  • 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

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Parametrics

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Part number Order Number of channels (#) Vs (Min) (V) Vs (Max) (V) CMRR (Min) (dB) Input offset (+/-) (Max) (uV) Input offset drift (+/-) (Max) (uV/C) Input bias current (+/-) (Max) (nA) Noise at 1 kHz (Typ) (nV/rt (Hz)) Iq (Typ) (mA) Bandwidth at min gain (Typ) (MHz) Gain (Min) (V/V) Gain (Max) (V/V) Gain error (+/-) (Max) (%) Operating temperature range (C) Package Group Package size: mm2:W x L (PKG) Noise at 0.1 Hz-10 Hz (Typ) (uVpp) Gain non-linearity (+/-) (Max) (%)
INA821 Order now 1     4.5     36     140     35     0.4     0.5     7     0.6     4.7     1     1000     0.15     -40 to 125     SOIC | 8     8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)     0.14     0.001    
INA828 Order now 1     4.5     36     140     50     0.5     0.6     7     0.6     2     1     1000     0.15     -40 to 125     SOIC | 8     8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)     0.14     0.001