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 70
o
C) and industrial (-40 to 85
o
C) temperature ranges.
Features
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Functionally Equivalent to National Semiconduc-
tor ADC0831 and ADC0832
WM0831: Differential or single ended input
WM0832: Two single ended inputs or a single
differential input
Ratiometric reference input (fixed for WM0832)
Serial I/O interface
Input range 0 to Vcc with Vcc Reference
8 pin package, SO or DIP
5V and 3.3V variants
Total Unadjusted Error: 鹵 1 LSB
8-bit resolution
32
碌
s conversion time at fclock = 250 kHz
Applications
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Embedding with remote sensors
Equipment health monitoring
Automotive
Industrial control
Block Diagrams
WM0831
CS
CLK
DI
WM0832
Internal CS
V
REF
Vcc
Vcc
Input Latch
Mux Select
Start Conv
Differential
Input
IN+
IN-
CLK
CH0
CH1
Comparator
Input
MUX
DAC
&
SAR
Logic
GND
WM0831
Output
Latch
DO
WM0832
GND
Output Shift
Register
Control
Logic
DAC
&
SAR
Logic
Control
Logic
Comparator
CS
V
REF
DO
Production Data
data sheets contain final
specifications current on publication date. Supply
of products conforms to Wolfson Microelectronics
standard terms and conditions.
Wolfson Microelectronics
Lutton Court, Bernard Terrace, Edinburgh EH8 9NX, UK
漏 1996 Wolfson Microelectronics
Tel: +44 (0) 131 667 9386
Fax: +44 (0) 131 667 5176
email: admin@wolfson.co.uk
www: http://www.wolfson.co.uk
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