Analog Front End with High Precision 24-Bit A-D Converter

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  • Description

    NA2202/2203/2204 are C-MOS based high precision AFE with up to 128 times internal PGA (Programmable Gain Amplifier). Internal 16/20/24-bit ΔΣ type A / D converter can perform conversion rates from 3.125ksps to 9.6ksps. NA2202/2203/2204 have error detection. (CRC8 or Check Sum.) It is useful for noise applications. It is also possible to turn off the CRC. NA2202/2203/2204 support bipolar operation of analog supply voltage, for example AVDD is set in +2.5V and AVSS is in -2.5V. A negative voltage input is possible such as thermocouple. Two matched excitation current sources supply the bias of pressure sensor, resistance temperature detectors, and so on. The matching error between two excitation current sources is less than 1% in 3-sigma. By using low power consumption mode, power consumption can be reduced to about 1/3 of normal operation. The conversion data rate in the low power consumption mode operates at 1/4 of the normal operation.


    • Temperature Controller
    • Pressure sensors
    • Flowmeters
    • PLC
    • Digital Panel Mater

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  • Spec
    Supply Voltage 2.7V to 5.5V
    Operating Current Analog(Normal) 2.9mA
    Analog(Low Power) 0.9mA
    Digital 0.26mA
    Speed 3.125ksps to 9.6ksps(Continuous conversion)
    Number of Pin 24
    Interface SPI
    Structure CMOS
    Wide Operating Temperature -40°C to +125°C
    Junction Temp. +150°C
    Package QFN4040-24-NB
    ADC Resolution 24-Bit (No missing codes)
    Excitation Current Source 2 systems(0.1mA, 0.25mA, 0.5mA, 1mA)
    Input mode Differential : 4 inputs / Single-ended : 8inputs / Pseudo-differential
    Note PGA 1V/V to 128V/V
    System Calibration for offset & gain drift
    Built-in Regulator 2.048V±20mV
    Conversion mode Single / Continuous
    CS (Chip Select)
    Error detection CRC8, Check Sum
  • Technical
  • Quality &
    • Refer to the datasheets for the details on the product.
    • The package file or the datasheet includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and recommended land pattern.

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Functional Description

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