NAU7802SGI

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1. General description

NAU7802SGI is a precision low-power 24-bit analog-to-digital converter (ADC) with a On-board low-noise programmable gain amplifier (PGA), on-board RC or crystal oscillator and a Precision 24-bit sigma-delta (Σ-Δ) analog-to-digital converter (ADC). The NAU7802SGI device has the following functions:

ENOB (effective number of bits) performance up to 23 bits. The device provides a complete front end Bridge/sensor measurement solutions, such as electronic scales, strain gauges and many other high Resolution, low sampling rate applications. Many built-in functions can achieve high-performance applications, while the number of external parts is small. In addition, the operating current and standby current are very low, and many power management Including features. These functions can only supply power to those components required on the chip, and In addition, if the full 23-bit ENOB performance is not required, it can also work with greatly reduced power. Programmable gain amplifier (PGA) provides selectable gains from 1 to 128. A/D conversion Executed with Sigma-Delta modulator and programmable FIR filter, the filter can be provided at the same time The 50Hz and 60Hz notch filter can effectively improve the anti-interference ability. In addition, this device also provides The standard 2-wire interface compatible with I2C protocol can be easily and directly connected with Interoperability with various possible host processors.

2. FEATURES

   1. Supply power: 2.7V~5.5V

   2. On-chip VDDA regulator for internal analog circuit or external load cell

       - Programmable VDDA: Off, 2.4V to 4.5V with eight options

         Minimum 10mA output drive capability at 3.0V output voltage

         Note: DVDD must be 0.3Vdc greater than desired VDDA output voltage

   3. 23 bits effective precision analog-to-digital converter

   4. Simultaneous 50Hz and 60Hz rejection (reaching －90dB）

   5. RMS Noise:

       - 50nV in 10 SPS data output rate and PGA gain = 128

       - 150nV in 80 SPS data output rate and PGA gain = 128

   6. Programmable PGA gains from 1 to 128

   7. Programmable ADC data output rates

   8. External differential reference voltage range from 0.1V to 5V

   9. System clock: External crystal oscillator or on-chip RC oscillator (4.9152Mhz)

 10. On-chip calibration

 11. On-chip power-on reset circuit

 12. On-chip temperature sensor

 13. Low Power Consumption and Programmable Power Management Options

      -  < 1uA standby current

 14. External 4.9152MHz Crystal oscillator

 15. System clock:

      - Internal 4.9152MHz RC oscillator (power-on default system clock)

      - External 4.9152MHz Crystal oscillator

 16. MCU control interface: 2-wire interface compatible with I2C protocol

 17. Operating Temperature: -40~85C

 18. Packages:

      - SOP-16 (150mil) / PDIP-16

3. APPLICATIONS

   1. Weigh scales

   2. Strain Gauge

   3. Industrial process control

   4. Liquid/gas flow control

   5. Pressure sensors

   6. Voltage monitors

4. PIN CONFIGURATION

5. PACKAGE DIMENSIONS