Rainbow Electronics ADC08832 - Manual

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