Overview
The INA821IDRGT is a high-precision instrumentation amplifier produced by Texas Instruments. This device is designed to offer low power consumption and operates over a wide single-supply or dual-supply range. It features super-beta input transistors, which provide low input offset voltage, offset voltage drift, input bias current, and input voltage and current noise. The INA821IDRGT is optimized for high common-mode rejection ratio and is suitable for various precision measurement applications.
Key Specifications
| Parameter | Typical Value | Unit |
|---|---|---|
| Input Stage Offset Voltage (VOSI) | 35 | µV |
| Offset Voltage Drift | 0.4 | µV/°C |
| Input Stage Voltage Noise (eNI) | 7 | nV/√Hz |
| Bandwidth (G = 1) | 4.7 | MHz |
| Bandwidth (G = 100) | 290 | kHz |
| Common-Mode Rejection Ratio (CMRR) at G = 1 | 92 | dB |
| Power-Supply Voltage (Single-Supply) | 4.5 to 36 | V |
| Power-Supply Voltage (Dual-Supply) | ±2.25 to ±18 | V |
| Quiescent Current (IQ) | 600 to 650 | µA |
| Operating Temperature Range | –40°C to +125°C | |
| Package Types | 8-pin SOIC, VSSOP, WSON |
Key Features
- High precision due to super-beta input transistors, resulting in low input offset voltage, offset voltage drift, input bias current, and input voltage and current noise.
- Single external resistor sets any gain from 1 to 10,000.
- High common-mode rejection ratio, exceeding 92 dB at G = 1.
- Low power consumption with quiescent current of 600 to 650 µA.
- Overvoltage protection up to ±40 V.
- Operates over a wide single-supply or dual-supply range.
- 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 measurements)
Q & A
- What is the typical input stage offset voltage of the INA821IDRGT?
The typical input stage offset voltage is 35 µV. - What is the offset voltage drift of the INA821IDRGT?
The offset voltage drift is 0.4 µV/°C. - What is the input stage voltage noise of the INA821IDRGT?
The input stage voltage noise is 7 nV/√Hz. - What is the bandwidth of the INA821IDRGT at a gain of 1?
The bandwidth at a gain of 1 is 4.7 MHz. - What is the common-mode rejection ratio (CMRR) of the INA821IDRGT at a gain of 1?
The CMRR at a gain of 1 exceeds 92 dB. - What is the power-supply voltage range for the INA821IDRGT?
The device can operate from a single supply of 4.5 to 36 V or a dual supply of ±2.25 to ±18 V. - What is the quiescent current of the INA821IDRGT?
The quiescent current is 600 to 650 µA. - What are the available package types for the INA821IDRGT?
The device is available in 8-pin SOIC, VSSOP, and WSON packages. - What is the operating temperature range of the INA821IDRGT?
The operating temperature range is –40°C to +125°C. - How is the gain of the INA821IDRGT set?
The gain is set by a single external resistor connected between pins 2 and 3, using the equation G = 1 + (49.4 kΩ / RG).
