Overview
The INA331AIDGKRG4 is a low-power, rail-to-rail output CMOS instrumentation amplifier produced by Texas Instruments. It is part of the INA331 family, which offers high gain accuracy, low noise, and a wide range of single-supply and bipolar-supply operation. This amplifier is designed for low-cost, high-precision applications and is suitable for battery or multi-channel systems due to its low quiescent current and fast shutdown/recovery times.
Key Specifications
| Parameter | Condition | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Input Offset Voltage (VOS) | VS = +5V | - | - | ±250 µV | µV |
| Quiescent Current (IQ) | VS = +5V | - | 415 µA | - | µA |
| Shutdown Current (ISD) | VS = +5V | - | 0.01 µA | - | µA |
| Common-Mode Rejection Ratio (CMRR) | DC, G = 25 | - | - | 94 dB | dB |
| Supply Voltage Range | - | +2.7V | - | +5.5V | V |
| Operating Temperature Range | - | -55°C | - | +125°C | °C |
| Thermal Resistance (θJA) | MSOP-8 | - | - | 150 °C/W | °C/W |
Key Features
- Low Cost and High Gain Accuracy: The INA331AIDGKRG4 offers a fixed gain of 5 with the option to set higher gains using external resistors, ensuring high accuracy with a gain error less than 0.1%.
- Low Offset Voltage: Specified at a maximum of ±250 µV, making it suitable for precision applications.
- High CMRR: A common-mode rejection ratio of 94 dB ensures minimal common-mode error even at higher frequencies.
- Rail-to-Rail Output: Achieves rail-to-rail output for gains of 10 or greater, with the ability to swing within 25mV of the supply rail.
- Low Quiescent Current and Fast Shutdown/Recovery: Consumes only 415 µA of quiescent current and can shutdown to 0.01 µA, recovering in microseconds.
- Wide Temperature Range: Fully specified over a temperature range of –55°C to +125°C.
Applications
- Differential Line Receivers: Ideal for applications requiring gain and common-mode rejection.
- Field Utility Meters: Suitable for metering applications due to its high precision and low noise.
- PCMCIA Cards: Used in compact, low-power data acquisition systems.
- Audio Amplifiers: Provides high fidelity amplification with low noise and high CMRR.
- Communication Systems: Used in various communication systems requiring high gain accuracy and low noise.
- Test Equipment: Ideal for general-purpose test and measurement equipment.
- Automotive Instrumentation: Suitable for automotive applications due to its wide temperature range and high reliability.
- Medical ECG Applications: Can be configured as a low-cost ECG amplifier for moderate accuracy heart-rate applications.
- Low-Power Data Acquisition Systems: Drives high-speed A/D converters efficiently, making it ideal for data acquisition systems.
Q & A
- What is the typical quiescent current of the INA331AIDGKRG4?
The typical quiescent current is 415 µA.
- How can the gain of the INA331AIDGKRG4 be set?
The gain can be set using external resistors according to the equation: G = 5 + 5 (R2/R1).
- What is the common-mode rejection ratio (CMRR) of the INA331AIDGKRG4?
The CMRR is specified at 94 dB for DC and a gain of 25.
- What is the operating temperature range of the INA331AIDGKRG4?
The operating temperature range is –55°C to +125°C.
- Can the INA331AIDGKRG4 be used in battery-powered applications?
Yes, it is suitable for battery-powered applications due to its low quiescent current and fast shutdown/recovery times.
- How does the INA331AIDGKRG4 handle common-mode input range?
The upper limit of the common-mode input range is set by the reference voltage, and the device is optimized to maintain low common-mode error even at higher frequencies.
- What is the typical offset voltage of the INA331AIDGKRG4?
The typical offset voltage is ±250 µV.
- Can the INA331AIDGKRG4 drive capacitive-input A/D converters?
Yes, it is optimized for directly driving capacitive-input, high-speed A/D converters.
- How does the shutdown feature work on the INA331AIDGKRG4?
The device can be shut down to a current of 0.01 µA and recovers in microseconds, making it suitable for multiplexing and portable applications.
- What package options are available for the INA331AIDGKRG4?
The device is available in an MSOP-8 package.
