Rainbow Electronics ADC08832 User Manual
General description, Applications, Features
ADC08831/ADC08832
8-Bit Serial I/O CMOS A/D Converters with Multiplexer
and Sample/Hold Function
General Description
The ADC08831/ADC08832 are 8-bit successive approxima-
tion Analog to Digital converters with 3-wire serial interfaces
and a configurable input multiplexer for 2 channels. The se-
rial I/O will interface to COPS
™
family, PLD’s, microproces-
sors, DSP’s, or shift registers. The serial I/O is configured to
comply with the NSC MICROWIRE
™
serial data exchange
standard.
To
minimize
total
power
consumption,
the
ADC08831/ADC08832 automatically go into low power
mode whenever they are not performing conversions.
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
combination
of
single-ended,
differential,
or
pseudo-differential modes. The voltage reference input can
be adjusted to allow encoding of small analog voltage spans
to the full 8-bits of resolution.
Applications
n
Digitizing sensors and waveforms
n
Process control monitoring
n
Remote sensing in noisy environments
n
Instrumentation
n
Embedded Systems
Features
n
3-wire serial digital data link requires few I/O pins
n
Analog input track/hold function
n
2-channel input multiplexer option with address logic
n
Analog input voltage range from GND to V
CC
n
No zero or full scale adjustment required
n
TTL/CMOS input/output compatible
n
Superior pin compatible replacement for ADC0831/2
Key Specifications
n
Resolution:
8 bits
n
Conversion time (f
C
= 2 MHz): 4µs (max)
n
Power dissipation:
8.5mW (typ)
n
Low power mode 3.0mW (typ)
n
Single supply:
5V
DC
n
Total unadjusted error:
±
1LSB
n
No missing codes over temperature
Typical Application
COPS
™
is a trademark of National Semiconductor Corporation.
MICROWIRE
™
is a trademark of National Semiconductor Corporation.
TRI-STATE
™
DS100108-44
DS100108-43
December 1998
ADC08831/ADC08832
8-Bit
Serial
I/O
CMOS
A/D
Converters
with
Multiplexer
and
Sample/Hold
Function
© 1998 National Semiconductor Corporation
DS100108
www.national.com