WM0831

WM0831, WM0832 Production Data Sept 1996 Rev 2.1 8-Bit ADCs with Serial Interface and Differential or Dual Inputs Description WM0831 and WM0832 are 8-bit analogue to digital converters (ADC) with serial I/O interfaces, providing a choice of input configurations in 8-pin SO or DIP packages. WM0831 has a differential input, also configurable as a single ended input. A-D conversion results are serially output on Data Out (DO) under the control of clock and chip select inputs. The device has a separate voltage reference input. WM0832's two input multiplexer is configurable via the Data In (DI) serial input, as two single ended inputs or a single differential input. The voltage reference operates ratiometrically and is internally connected to the VCC pin. Conversion is initiated by bringing and holding chip select low while providing a clock input. With WM0831's fixed input configuration, the conversion result is output at DO on the clock's falling edges in MSB to LSB order. With WM0832's configurable input multiplexer, data is input to DI on the rising edges of the clock to setup the Mux and initiate conversion. Conversion results appear serially at DO on the falling edges of the clock, first in MSB to LSB order, and then repeated in LSB to MSB order. WM0831/2 operate on 5V or 3.3V supply voltages and are available in small outline and DIP packages for commercial (0 to 70oC) and industrial (-40 to 85oC) temperature ranges. Features Functionally Equivalent ...