Texas Instruments INA821
The INA821 is a high-precision instrumentation amplifier that offers low power consumption and operates over a wide single-supply or dual-supply range. 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. The INA821 is optimized to provide a high commonmode rejection ratio.| Part No. | INA821 |
|---|---|
| Datasheet | INA821 Download |
| Manufacturer |  Texas Instruments |
| Description | Precision Instrumentation Amplifier |
| Buy | Stock & Price |
FEATURES
●1 Low offset voltage: 10 µV (typ), 35 µV (max)● Gain drift: 5 ppm/°C (G = 1), 35 ppm/°C (G > 1) (max)
● 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 (min)
● Power supply rejection: 110 dB, G = 1 (min)
● 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
● Packages: 8-pin SOIC, VSSOP, and WSON 2
APPLICATIONS
● Analog input module● Flow transmitter
● Battery test
● LCD test
● Electrocardiogram (ECG)
● Surgical equipment
● Process analytics (pH, gas, concentration, force and humidity) 3
DESCRIPTION
A single external resistor sets any gain from 1 to 10,000. Additional circuitry protects the inputs against overvoltage up to ±40 V. At G = 1, the common-mode rejection ratio exceeds 92 dB across the full input common-mode range. The device is designed for lowvoltage operation from a 4.5-V single supply, and dual supplies up to ±18 V.
