ANALOG DEVICES AD7781BRUZ Analogue to Digital Converter, 20 bit, Differential, 2 Wire, Serial, SPI, Single, 2.7 V

AD7781 is a 20bit, pin-programmable, low power Sigma-Delta ADC. A complete, low power front-end solution for bridge sensor products, including weigh scales, strain gauges, and pressure sensors. It contains a precision, low power, 20bit sigma-delta (?-?) ADC, an on-chip, low noise programmable gain amplifier (PGA), and an on-chip oscillator. For ease of use, all the features of the AD7781 are controlled by dedicated pins. Each time that a data read occurs, eight status bits are appended to the 20bit conversion. These status bits contain a pattern sequence that can be used to confirm the validity of the serial transfer. Typical applications include weigh scales, pressure measurement, industrial process control, portable instrumentation.

• Pin-programmable filter response, update rate: 10Hz or 16.7Hz
• Pin-programmable in-amp gain
• Pin-programmable power-down and reset
• Status function and internal clock oscillator
• Internal bridge power-down switch current: 115?A typical (gain = 1) and 330?A typical (gain = 128)
• Simultaneous 50Hz/60Hz rejection
• Power supply: 2.7V to 5.25V
• 2-wire serial interface (read-only device) SPI compatible and Schmitt trigger on SCLK
• 16 lead TSSOP package
• Operating temperature range from -40 to 105°C

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party