The AD7781BRZ is a 20-bit pin-programmable low power sigma-delta Analog-to-digital Converter (ADC) for bridge sensor products. Consuming only 330μA, the AD7781 is particularly suitable for portable or battery-operated products where very low power is required. It also has a power-down mode that allows the user to switch-OFF the power to the bridge sensor and power down the AD7781 when not converting, thus increasing the battery life of the product. For ease of use, all the features of the converter are controlled by dedicated pins. Each time a data read occurs, eight status bits are appended to the 24-bit conversion. These status bits contain a pattern sequence that can be used to confirm the validity of the serial transfer.
Pin-programmable filter response
Pin-programmable in-amp gain
Pin-programmable power-down and reset
Status function
Internal clock oscillator
Internal bridge power-down switch
Independent interface power supply
2-wire serial interface - SPI compatible and Schmitt trigger on SCLK
(EN)
