Overview
The INA821IDGKR 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 INA821IDGKR is optimized for high common-mode rejection ratio and is suitable for various precision measurement applications.
Key Specifications
| Parameter | Value |
|---|---|
| Package Type | 8-pin SOIC, VSSOP, WSON |
| Operating Temperature Range | –40°C to +125°C |
| Supply Range | Single-supply: 4.5 V to 36 V, Dual-supply: ±2.25 V to ±18 V |
| Input 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) |
| Common-Mode Rejection Ratio | 112 dB, G = 10 (min) |
| Power Supply Rejection Ratio | 110 dB, G = 1 (min) |
| Supply Current | 650 µA (max) |
| Input Protection | Up to ±40 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 supply current: 650 µA (max)
- Wide supply range: Single-supply (4.5 V to 36 V), Dual-supply (±2.25 V to ±18 V)
Applications
The INA821IDGKR is suitable for a variety of precision measurement applications, including:
- Medical devices: ECG, EEG, and other biomedical signal amplification
- Industrial automation: Sensor signal conditioning and amplification
- Aerospace and defense: High-precision measurement systems
- Test and measurement equipment: Precision amplification of small signals
- Automotive systems: Sensor signal conditioning and amplification
Q & A
- What is the typical input offset voltage of the INA821IDGKR?
The typical input offset voltage is 10 µV, with a maximum of 35 µV. - What is the gain drift of the INA821IDGKR?
The gain drift is 5 ppm/°C (G = 1) and 35 ppm/°C (G > 1) (max). - What is the bandwidth of the INA821IDGKR at a gain of 1?
The bandwidth at a gain of 1 is 4.7 MHz. - How is the input protection of the INA821IDGKR?
The inputs are protected up to ±40 V. - What is the common-mode rejection ratio of the INA821IDGKR?
The common-mode rejection ratio is 112 dB at G = 10 (min). - What are the available package types for the INA821IDGKR?
The available package types are 8-pin SOIC, VSSOP, and WSON. - What is the operating temperature range of the INA821IDGKR?
The operating temperature range is –40°C to +125°C. - What is the supply current of the INA821IDGKR?
The supply current is 650 µA (max). - Can the INA821IDGKR operate on a single supply or dual supply?
The INA821IDGKR can operate on both single-supply (4.5 V to 36 V) and dual-supply (±2.25 V to ±18 V). - How is the noise performance of the INA821IDGKR?
The noise performance is 7 nV/√Hz.
