INA2331AIPWT Integrated Circuits (ICs)

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1. Describe

The INA331 and INA2331AIPWT are rail-to-rail output, low power CMOS instrumentation amplifier offering wide range, single supply operation as well as bipolar supply operation. this The INA331 family provides low-cost, low-noise amplification Differential Signaling with Low Quiescent Current of 415µA (down to 0.01µA in shutdown). Back to normal Running in microseconds, this INA can be used to battery or multi-channel applications. The INA331 is internally configured for a gain of 5V/V, providing Flexibility to achieve higher gain by choosing external resistors. The INA331 rejects line noise and its harmonics because Even at higher frequencies, the common-mode error remains low. High bandwidth and slew rate make the INA331 ideal for Direct-drive sampling analog-to-digital (A/D) converters as well as universal applications. High precision, low cost, small package, The INA331 outperforms discrete designs. They are designated as Wide temperature range from –55°C to +125°C.

2. Feature

    1. Designed for low cost

    2. High gain accuracy: G = 5, 0.02%, 2ppm/°C

    3. Gain setting and expansion. > 5V/V resistor

    4. Low offset voltage: ±250µV

    5. High CMRR: 94dB DC, 50dB at 45kHz

    6. Low bias current: 0.5pA

    7. Bandwidth, conversion rate: 2.0MHz, 5V/µs

    8. Rail-to-rail output swing: (V+) – 0.02V

    9. Wide temperature range: –55°C to +125°C

  10. Low quiescent current: up to 490µA/channel

  11. Shutdown: 0.01µA

  12. MSOP-8 single package and TSSOP-14 dual package

3. Application

    1. Industrial sensor amplifier: Bridge, RTD, Thermocouple, Position

    2. Physiological amplifier: ECG, EEG, EMG

    3. A/D converter signal conditioning

    4. Differential line receiver with gain

    5. On-site public instruments

    6. PCMCIA card

    7. Audio amplifier

    8. Communication system

    9. Test equipment

  10. Car instrumentation

4. Pin configuration

5. Application Information

The INA2331AIPWT is an improved version of the classic "dual op amp" instrumentation amplifier with an additional gain amplifier. For noisy or high impedance applications, the power supply should be capacitively decoupled with a 0.1µF capacitor as close to the INA331 as possible. The output is called the reference and it must be at least 1.2V below the positive rail.