Overview
The INA823 is a precision, low-power, wide-supply instrumentation amplifier from Texas Instruments. It is designed to operate over a wide single-supply or dual-supply range, making it versatile for various applications. The device features low power consumption, low input offset voltage, and high common-mode rejection ratio, making it suitable for high-precision measurements in a variety of fields.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (Single Supply) | 2.7 | 36 | V | |
| Supply Voltage (Dual Supply) | ±1.35 | ±18 | V | |
| Input Stage Offset Voltage | 20 | 100 | µV | |
| Input Bias Current | 1.2 | 8 | nA | |
| Common-Mode Rejection Ratio (G = 1) | 84 | dB | ||
| Power Supply Rejection Ratio (G = 1) | 100 | 130 | dB | |
| Bandwidth (G = 1) | 1.9 | MHz | ||
| Quiescent Current | 180 | 250 | µA | |
| Operating Temperature Range | -40 | 125 | °C | |
| Package Types | 8-pin SOIC, 8-pin VSSOP |
Key Features
- Input overvoltage protection up to ±60 V
- Input voltage extends 150 mV below negative supply
- Low power supply current: 180 µA (typ)
- Precision performance: low offset voltage, low input bias current, high common-mode rejection ratio
- Wide supply range: single-supply (2.7 V to 36 V), dual-supply (±1.35 V to ±18 V)
- Stable with 1-nF capacitive loads
- Gain adjustable from 1 to 10,000 using an external resistor
Applications
- Flow transmitter
- Wearable fitness and activity monitor
- Infusion pump
- Blood glucose monitor
- Electrocardiogram (ECG)
- Surgical equipment
- Weigh scale
- Analog input module
- Process analytics (pH, gas, concentration, force, and humidity)
- Battery test
Q & A
- What is the supply voltage range for the INA823? The INA823 operates on a single supply from 2.7 V to 36 V or a dual supply from ±1.35 V to ±18 V.
- What is the typical quiescent current of the INA823? The typical quiescent current is 180 µA.
- What is the common-mode rejection ratio of the INA823 at a gain of 1? The common-mode rejection ratio is at least 84 dB at a gain of 1.
- How is the gain of the INA823 adjusted? The gain is adjusted using an external resistor connected between pins 1 and 8.
- What is the input overvoltage protection of the INA823? The INA823 has input overvoltage protection up to ±60 V.
- What are the package types available for the INA823? The INA823 is available in 8-pin SOIC and 8-pin VSSOP packages.
- What is the operating temperature range of the INA823? The operating temperature range is from -40°C to 125°C.
- What are some typical applications of the INA823? Typical applications include flow transmitters, wearable fitness monitors, infusion pumps, blood glucose monitors, ECGs, surgical equipment, weigh scales, analog input modules, and process analytics.
- How stable is the INA823 with capacitive loads? The INA823 is stable with 1-nF capacitive loads.
- What is the bandwidth of the INA823 at a gain of 1? The bandwidth at a gain of 1 is 1.9 MHz.
