INA821 - 35-μV Offset, 7-nV/√Hz Noise, Low-Power, Precision Instrumentation Amplifier

The INA821 is a high-precision instrumentation amplifier that offers low powerconsumption and operates over a wide single- or dual-supply range. A single external resistor setsany gain from 1 to 10,000. The device has high precision as a result of super-beta inputtransistors, which provide low input offset voltage, offset voltage drift, input bias current, andinput 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, thecommon-mode rejection ratio exceeds 92 dB across the full input common-mode range. The device isdesigned for low-voltage operation from a 4.5-V single supply and dual supplies up to ±18 V. TheINA821 is available in an 8-pin SOIC package and specified over the –40°C to +125°C temperaturerange.

• 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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