ADC1038
10-Bit Serial I/O A/D Converter with Analog Multiplexer
and Track/Hold Function
General Description
The ADC1038 is a 10-bit successive approximation A/D con-
verters with serial I/O. The serial input controls a
single-ended analog multiplexer that selects one of 8 input
channels. The serial output data can be configured into a
left- or right-justified format.
An input track/hold is implemented by a capacitive reference
ladder and sampled-data comparator. This allows the analog
input to vary during the A/D conversion cycle.
Separate serial I/O and conversion clock inputs are provided
to facilitate the interface to various microprocessors.
Applications
n Engine control
n Process control
n Instrumentation
n Test equipment
Features
n Serial I/O ( MICROWIRE™ compatible)
n Separate asynchronous converter clock and serial data
I/O clock
n Analog input track/hold function
n Ratiometric or absolute voltage referencing
n No zero or full scale adjustment required
n 0V to 5V analog input range with single 5V power
supply
n TTL/MOS input/output compatible
n No missing codes
Key Specifications
n Resolution 10 bit
n Total unadjusted error ±1 LSB (max)
n Single supply 5V ±5%
n Power dissipation 20 mW (max)
n Max. conversion time (f
C
= 3 MHz) 13.7 µs (max)
n Serial data exchange time (f
S
= 1 MHz) 10 µs (max)
Connection Diagrams
Ordering Information
Industrial −40˚C ≤ T
A
≤ +85˚C Package
ADC1038CIWM M20B
TRI-STATE
®
is a registered trademark of National Semiconductor Corporation.
MICROWIRE™ is a trademark of National Semiconductor Corporation.
SO Package
DS010556-2
Top View
ADC1038 In NS Package
M20B
June 1999
ADC1038
10-Bit
Serial
I/O
A/D
Converter
with
Analog
Multiplexer
and
T
rack/Hold
Function
© 1999 National Semiconductor Corporation DS010556 www.national.com