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ADC08031/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 standard for easy interface to the
COPS family of controllers, and can easily interface with
standard shift registers or microprocessors.
The ADC08034 and ADC08038 provide a 2.6V band-gap de-
rived reference. For devices offering guaranteed voltage ref-
erence performance over temperature see ADC08131,
ADC08134 and ADC08138.
A track/hold function allows the analog voltage 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 (fC= 1 MHz)
8s (max)
n Power dissipation
20mW (max)
n Single supply
5V
DC (±5%)
n Total unadjusted error
±12 LSB and ±1LSB
n No missing codes over temperature
Ordering Information
Industrial (40C
≤ T
A ≤ +85C)
Package
ADC08031CIN
N08E
ADC08031CIWM, ADC08034CIWM
M14B
ADC08038CIWM
M20B
TRI-STATE is a registered trademark of National Semiconductor Corporation.
COPS microcontrollers and MICROWIRE are trademarks of National Semiconductor Corporation.
June 1999
ADC08031/ADC08034/ADC08038
8-Bit
High-Speed
Serial
I/O
A/D
Converters
with
Multiplexer
Options,
V
oltage
Reference,
and
T
rack/Hold
Function
1999 National Semiconductor Corporation
DS010555
www.national.com
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