This part is a kind of semiconductor called AD7781.

Function of this product has Low Power Sigma-Delta ADC.

Manufacturers : Analog Devices

Image and pinout :

Some of the text within the PDF file :

20-Bit, Pin-Programmable, Low Power Sigma-Delta ADC AD7781 FEATURES Pin-programmable filter response Update rate: 10 Hz or 16.7 Hz Pin-programmable in-amp gain Pin-programmable power-down and reset Status function Internal clock oscillator Internal bridge power-down switch Current 115 μA typical (gain = 1) 330 μA typical (gain = 128) Simultaneous 50 Hz/60 Hz rejection Power supply: 2.7 V to 5.25 V −40°C to +105°C temperature range Independent interface power supply Packages 14-lead, narrow body SOIC 16-lead TSSOP 2-wire serial interface (read-only device) SPI compatible Schmitt trigger on SCLK FUNCTIONAL BLOCK DIAGRAM GND AVDD GAIN REFIN(+) REFIN(–) AIN(+) G=1 OR 128 AIN(–) BPDSW INTERNAL CLOCK 20-BIT Σ-Δ ADC DOUT/RDY SCLK DVDD 08162-001 FILTER PDRST AD7781 Figure 1. Tabl [ ... ]

AD7781 PDF Datasheet Download