ADC08131/ADC08134/ADC08138 8-Bit High-Speed Serial I/O A/D Converters with Multiplexer
Options, Voltage Reference, and Track/Hold Function
June 1999
ADC08131/ADC08134/ADC08138
8-Bit High-Speed Serial I/O A/D Converters with
Multiplexer Options, Voltage Reference, and Track/Hold
Function
General Description
The ADC08131/ADC08134/ADC08138 are 8-bit successive
approximation A/D converters with serial I/O and config-
urable input multiplexers with up to 8 channels. The serial
I/O is configured to comply with the NSC MICROWIRE
™
se-
rial data exchange standard for easy interface to the
COPS
™
family of controllers, and can easily interface with
standard shift registers or microprocessors.
All three devices provide a 2.5V band-gap derived reference
with guaranteed performance over temperature.
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
n
n
n
Digitizing automotive sensors
Process control/monitoring
Remote sensing in noisy environments
Embedded diagnostics
Features
n
Serial digital data link requires few I/O pins
n
Analog input track/hold function
n
4- or 8-channel input multiplexer options with address
logic
n
On-chip 2.5V band-gap reference (
±
2% over
temperature guaranteed)
n
No zero or full scale adjustment required
n
TTL/CMOS input/output compatible
n
0V to 5V analog input range with single 5V power
supply
Key Specifications
n
n
n
n
n
n
n
n
Resolution
8 Bits
Conversion time (f
C
= 1 MHz)
8 µs (Max)
Power dissipation
20 mW (Max)
Single supply
5 V
DC
(
±
5%)
±
1
⁄
2
LSB and
±
1 LSB
Total unadjusted error
±
1
⁄
2
LSB
Linearity Error (V
REF
= 2.5V)
No missing codes (over temperature)
On-board Reference
+2.5V
±
1.5% (Max)
Ordering Information
Industrial
(−40˚C
≤
T
A
≤
+85˚C)
ADC08131CIWM
ADC08134CIWM
ADC08138CIWM
M14B
M14B
M20B
Package
TRI-STATE
®
is a registered trademark of National Semiconductor Corporation.
COPS
™
microcontrollers and MICROWIRE
™
are trademarks of National Semiconductor Corporation.
© 1999 National Semiconductor Corporation
DS010749
www.national.com
NSC [ NATIONAL SEMICONDUCTOR ]
