ADC08831 Datasheet, PDF (1/23 Pages) National Semiconductor (TI) – 8-Bit Serial I/O CMOS A/D Converters with Multiplexer and Sample/Hold Function

September 1999
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 of micro-controllers,
PLD’s, microprocessors, DSP’s, or shift registers. The serial
I/O is configured to comply with the NSC MICROWIRE™ se-
rial 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
combinations 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™
© 1999 National Semiconductor Corporation DS100108
DS100108-44
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