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WM0838

Wolfson Microelectronics plc
Part Number WM0838
Manufacturer Wolfson Microelectronics plc
Description 8-Bit ADCs with Serial Interface and Configurable Input Multiplexer
Published Apr 17, 2005
Detailed Description WM0834, WM0838 Production Data Sept 1996 Rev 2.0 8-Bit ADCs with Serial Interface and Configurable Input Multiplexer De...
Datasheet PDF File WM0838 PDF File

WM0838
WM0838

Overview
WM0834, WM0838 Production Data Sept 1996 Rev 2.
0 8-Bit ADCs with Serial Interface and Configurable Input Multiplexer Description WM0834 and WM0838 are 8-bit analogue to digital converters (ADC) with configurable 4-input and 8-input multiplexers respectively and a serial I/O interface.
Assignment of the multiplexer inputs is configured before each conversion via the serial data input to give single-ended or differential operation for the selected inputs.
A mixture of input configurations can be used in the same application.
WM0838 also has a pseudo-differential configuration where all 8 inputs can be refered to a common input at an arbitrary voltage.
Serial communcation with WM0834/8 is via Data In (DI) and Data Out (DO) wires under the control of clock and chip select inputs.
A high output at the SARS pin indicates when the conversion is in progress.
To initiate a conversion chip enable is held low and data is input to DI on the rising edge of the clock, comprising, a start bit, and bits to set up the input configuration and polarity.
After a half clock cycle delay conversion results appear at DO on the falling edge of the clock, MSB first, concurrently with A-D conversion.
This is followed by the results LSB first, indicated by the falling edge of SARS.
WM0838 has a shift enable (SE) input used to control the LSB first output on DO.
WM0834/8 operate on 5V and 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 to National Semiconductor ADC0834 and ADC0838 without the Internal Zener Regulator Network 4-input (WM0834) or 8-input (WM0838) MUX options Reference input operates ratiometrically or with a fixed reference Input range 0 to Vcc with Vcc Reference 5V and 3.
3V variants Total Unadjusted Error: ± 1 LSB 8-bit resolution Low Power 32 µs conversion time at fclock = 250 kHz Serial I/O interface WM0834 packages: 14 pin SO & DIP WM0838 p...


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