Overview
The INA821IDR is a high-precision instrumentation amplifier produced by Texas Instruments. It is designed to offer low power consumption and operates over a wide range of single-supply or dual-supply voltages. The device features high precision due to super-beta input transistors, which provide low input offset voltage, offset voltage drift, input bias current, and input voltage and current noise. The INA821IDR is available in 8-pin SOIC, VSSOP, and WSON packages and is specified over the –40°C to +125°C temperature range.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Offset Voltage | 10 µV (typ), 35 µV (max) | µV |
| Gain Drift | 5 ppm/°C (G = 1), 35 ppm/°C (G > 1) (max) | ppm/°C |
| Noise | 7 nV/√Hz | nV/√Hz |
| Bandwidth | 4.7 MHz (G = 1), 290 kHz (G = 100) | MHz, kHz |
| Common-Mode Rejection Ratio | 112 dB, G = 10 (min) | dB |
| Power Supply Rejection Ratio | 110 dB, G = 1 (min) | dB |
| Supply Current | 650 µA (max) | µA |
| Supply Range | Single-supply: 4.5 V to 36 V, Dual-supply: ±2.25 V to ±18 V | V |
| Operating Temperature Range | –40°C to +125°C | °C |
| Input Overvoltage Protection | Up to ±40 V | V |
Key Features
- Low offset voltage: 10 µV (typ), 35 µV (max)
- Low gain drift: 5 ppm/°C (G = 1), 35 ppm/°C (G > 1) (max)
- Low noise: 7 nV/√Hz
- High bandwidth: 4.7 MHz (G = 1), 290 kHz (G = 100)
- Stable with 1-nF capacitive loads
- Inputs protected up to ±40 V
- High common-mode rejection ratio: 112 dB, G = 10 (min)
- High power supply rejection ratio: 110 dB, G = 1 (min)
- Low power consumption: 650 µA (max) supply current
- Wide 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
- Available in 8-pin SOIC, VSSOP, and WSON packages
Applications
- Analog input modules
- Flow transmitters
- Battery testing
- LCD testing
- Electrocardiogram (ECG) equipment
- Surgical equipment
- Process analytics (pH, gas, concentration, force, and humidity)
Q & A
- What is the typical input offset voltage of the INA821IDR?
The typical input offset voltage is 10 µV, with a maximum of 35 µV.
- What is the gain drift of the INA821IDR?
The gain drift is 5 ppm/°C (G = 1) and 35 ppm/°C (G > 1) (max).
- What is the noise level of the INA821IDR?
The noise level is 7 nV/√Hz.
- What is the bandwidth of the INA821IDR?
The bandwidth is 4.7 MHz (G = 1) and 290 kHz (G = 100).
- What is the common-mode rejection ratio of the INA821IDR?
The common-mode rejection ratio is 112 dB, G = 10 (min).
- What is the power supply rejection ratio of the INA821IDR?
The power supply rejection ratio is 110 dB, G = 1 (min).
- What is the maximum supply current of the INA821IDR?
The maximum supply current is 650 µA.
- What is the operating temperature range of the INA821IDR?
The operating temperature range is –40°C to +125°C.
- What types of packages are available for the INA821IDR?
The INA821IDR is available in 8-pin SOIC, VSSOP, and WSON packages.
- What are some common applications of the INA821IDR?
Common applications include analog input modules, flow transmitters, battery testing, LCD testing, ECG equipment, surgical equipment, and process analytics.
