Overview
The INA821IDRGR 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 super-beta input transistors, which provide low input offset voltage, offset voltage drift, input bias current, and input voltage and current noise. Additionally, the INA821 includes circuitry that protects the inputs against overvoltage up to ±40 V. It 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 |
|---|---|
| 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) |
| Input Protection | Up to ±40 V |
| Common-Mode Rejection Ratio | 112 dB, G = 10 (min) |
| Power Supply Rejection Ratio | 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 |
| Operating Temperature Range | –40°C to +125°C |
| Package Types | 8-pin SOIC, VSSOP, and WSON |
Key Features
- Low offset voltage and offset voltage drift
- High bandwidth and low noise
- Stable operation with 1-nF capacitive loads
- Input protection up to ±40 V
- High common-mode rejection ratio and power supply rejection ratio
- Low power consumption with a maximum supply current of 650 µA
- Wide supply range: single-supply from 4.5 V to 36 V and dual-supply from ±2.25 V to ±18 V
- Gain adjustable from 1 to 10,000 using a single external resistor
Applications
The INA821IDRGR is suitable for various precision measurement applications, including:
- Medical devices requiring high accuracy and low noise
- Industrial control systems needing precise signal amplification
- Aerospace and defense applications where high reliability and precision are critical
- Test and measurement equipment requiring high bandwidth and low noise
- Automotive systems that demand robust and precise signal processing
Q & A
- What is the typical offset voltage of the INA821IDRGR?
The typical offset voltage is 10 µV, with a maximum of 35 µV.
- What is the bandwidth of the INA821IDRGR at a gain of 1?
The bandwidth at a gain of 1 is 4.7 MHz.
- How is the gain of the INA821IDRGR adjusted?
The gain can be adjusted from 1 to 10,000 using a single external resistor.
- What is the common-mode rejection ratio of the INA821IDRGR?
The common-mode rejection ratio is 112 dB at a gain of 10 (min).
- What is the maximum supply current of the INA821IDRGR?
The maximum supply current is 650 µA.
- What are the available package types for the INA821IDRGR?
The available package types are 8-pin SOIC, VSSOP, and WSON.
- What is the operating temperature range of the INA821IDRGR?
The operating temperature range is –40°C to +125°C.
- Is the INA821IDRGR protected against overvoltage?
- What is the noise level of the INA821IDRGR?
The noise level is 7 nV/√Hz.
- Can the INA821IDRGR operate with a single supply or dual supply?
