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ADC08031/ADC08032/ADC08034/ADC08038
8-Bit High-Speed Serial I/O A/D Converters with
Multiplexer Options, Voltage Reference, and Track/Hold
Function
General Description
The ADC08031/ADC08032/ADC08034/ADC08038 are 8-bit
successive approximation A/D converters with serial I/O and
configurable input multiplexers with up to 8 channels. The
serial I/O is configured to comply with the NSC MICROW-
IRE
™
serial data exchange standardfor easy interface to the
COPS
™
family of controllers, and can easily interface with
standard shift registers or microprocessors.
TheADC08034 andADC08038 provide a 2.6V band-gap de-
rived reference. For devices offering guaranteed voltage ref-
erence performance over temperature see ADC08131,
ADC08134 and ADC08138.
Atrack/hold function allows the analogvoltage at the positive
input to vary during the actual A/D conversion.
The analog inputs can be configured to operate in various
combinations of single-ended, differential, or
pseudo-differential modes. In addition, input voltage spans
as small as 1V can be accommodated.
Applications
n Digitizing automotive sensors
n Process control monitoring
n Remote sensing in noisy environments
n Instrumentation
n Test systems
n Embedded diagnostics
Features
n Serial digital data link requires few I/O pins
n Analog input track/hold function
n 2-, 4-, or 8-channel input multiplexer options with
address logic
n 0V to 5V analog input range with single 5V power
supply
n No zero or full scale adjustment required
n TTL/CMOS input/output compatible
n On chip 2.6V band-gap reference
n 0.3" standard width 8-, 14-, or 20-pin DIP package
n 14-, 20-pin small-outline packages
Key Specifications
n Resolution: 8 bits
n Conversion time (f
C
= 1 MHz): 8µs (max)
n Power dissipation: 20mW (max)
n Single supply: 5V
DC
(
±
5%)
n Total unadjusted error:
±
1
⁄
2
LSB and
±
1LSB
n No missing codes over temperature
Ordering Information
Industrial (−40˚C ≤ T
A
≤ +85˚C) Package
ADC08031CIN* N08E
ADC08038CIN* N20A
ADC08031CIWM,
ADC08032CIWM, M14B
ADC08034CIWM
ADC08038CIWM M20B
*
Not recomended for new designs.
COPS
™
microcontrollers and MICROWIRE
™
are trademarks of National Semiconductor Corporation.
June 2000
ADC08031/ADC08032/ADC08034/ADC08038 8-Bit High-Speed Serial I/O A/D Converters with
Multiplexer Options, Voltage Reference, and Track/Hold Function
© 2000 National Semiconductor Corporation DS010555 www.national.com
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