Overview
The INA828 is a high-precision instrumentation amplifier produced by Texas Instruments. It is part of the second generation of precision instrumentation amplifiers, succeeding the INA128. This device is characterized by its low power consumption and the ability to operate over a wide range of single or dual supplies. The INA828 features exceptionally low input offset voltage, offset voltage drift, input bias current, and input voltage and current noise, thanks to the use of new super-beta input transistors. It also includes input protection against overvoltage up to ±40 V and offers excellent common-mode rejection ratio, exceeding 90 dB across the full input common-mode range at a gain of 1. The device is available in an 8-pin SOIC package and is specified over a temperature range of –40°C to +125°C.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Low Offset Voltage | 50 µV, MAX | µV |
| Gain Drift | 5 ppm/°C (G = 1), 50 ppm/°C (G > 1) | ppm/°C |
| Noise | 7 nV/√Hz | nV/√Hz |
| Bandwidth | 2 MHz (G = 1), 260 kHz (G = 100) | MHz, kHz |
| Stable with Capacitive Loads | 1-nF | nF |
| Input Protection | Up to ±40 V | V |
| Common-Mode Rejection Ratio | 110 dB, MIN (G = 10) | dB |
| Power-Supply Rejection Ratio | 100 dB, MIN (G = 1) | dB |
| Supply Current | 650 µA, MAX | µA |
| Supply Range | Single: 4.5 V to 36 V, Dual: ±2.25 V to ±18 V | V |
| Specified Temperature Range | –40°C to +125°C | °C |
| Package | 8-Pin SOIC |
Key Features
- Low offset voltage of 50 µV, MAX, and low offset voltage drift.
- Exceptionally low noise of 7 nV/√Hz.
- High bandwidth: 2 MHz at G = 1 and 260 kHz at G = 100.
- Stable operation with 1-nF capacitive loads.
- Input protection up to ±40 V.
- Excellent common-mode rejection ratio, exceeding 90 dB at G = 1.
- Wide supply range: single supply from 4.5 V to 36 V and dual supply from ±2.25 V to ±18 V.
- Low power consumption with a supply current of 650 µA, MAX.
- Gain adjustable from 1 to 1000 using a single external resistor.
Applications
- Industrial Process Controls
- Circuit Breakers
- Battery Testers
- ECG Amplifiers
- Power Automation
- Medical Instrumentation
- Portable Instrumentation
Q & A
- What is the maximum offset voltage of the INA828?
The maximum offset voltage of the INA828 is 50 µV.
- How does the gain drift of the INA828 vary with temperature?
The gain drift of the INA828 is 5 ppm/°C at G = 1 and 50 ppm/°C for gains greater than 1.
- What is the noise performance of the INA828?
The INA828 has a noise performance of 7 nV/√Hz.
- What is the bandwidth of the INA828 at different gains?
The bandwidth of the INA828 is 2 MHz at G = 1 and 260 kHz at G = 100.
- Can the INA828 handle capacitive loads?
Yes, the INA828 is stable with 1-nF capacitive loads.
- What level of input protection does the INA828 offer?
The INA828 offers input protection up to ±40 V.
- What is the common-mode rejection ratio of the INA828?
The common-mode rejection ratio of the INA828 exceeds 110 dB at G = 10.
- What is the supply current of the INA828?
The supply current of the INA828 is 650 µA, MAX.
- What is the operating temperature range of the INA828?
The INA828 operates over a temperature range of –40°C to +125°C.
- In what package is the INA828 available?
The INA828 is available in an 8-pin SOIC package.
