ADC0816/ADC0817 8-Bit µP Compatible A/D Converters with 16-Channel Multiplexer
July 1999
ADC0816/ADC0817
8-Bit µP Compatible A/D Converters
with 16-Channel Multiplexer
General Description
The ADC0816, ADC0817 data acquisition component is a
monolithic CMOS device with an 8-bit analog-to-digital con-
verter, 16-channel multiplexer and microprocessor compat-
ible control logic. The 8-bit A/D converter uses successive
approximation as the conversion technique. The converter
features a high impedance chopper stabilized comparator, a
256R voltage divider with analog switch tree and a succes-
sive approximation register. The 16-channel multiplexer can
directly access any one of 16-single-ended analog signals,
and provides the logic for additional channel expansion.
Signal conditioning of any analog input signal is eased by
direct access to the multiplexer output, and to the input of the
8-bit A/D converter.
The device eliminates the need for external zero and
full-scale adjustments. Easy interfacing to microprocessors
is provided by the latched and decoded multiplexer address
inputs and latched TTL TRI-STATE
®
outputs.
The design of the ADC0816, ADC0817 has been optimized
by incorporating the most desirable aspects of several A/D
conversion techniques. The ADC0816, ADC0817 offers high
speed, high accuracy, minimal temperature dependence,
excellent long-term accuracy and repeatability, and con-
sumes minimal power. These features make this device
ideally suited to applications from process and machine
control to consumer and automotive applications. For similar
performance in an 8-channel, 28-pin, 8-bit A/D converter,
see the ADC0808, ADC0809 data sheet. (See AN-258 for
more information.)
Features
n
Easy interface to all microprocessors
n
Operates ratiometrically or with 5 V
DC
or analog span
adjusted voltage reference
n
16-channel multiplexer with latched control logic
n
Outputs meet TTL voltage level specifications
n
0V to 5V analog input voltage range with single 5V
supply
n
No zero or full-scale adjust required
n
Standard hermetic or molded 40-pin DIP package
n
Temperature range −40˚C to +85˚C or −55˚C to +125˚C
n
Latched TRI-STATE output
n
Direct access to “comparator in” and “multiplexer out” for
signal conditioning
n
ADC0816 equivalent to MM74C948
n
ADC0817 equivalent to MM74C948-1
Key Specifications
n
n
n
n
n
Resolution
Total Unadjusted Error
Single Supply
Low Power
Conversion Time
8 Bits
±
1
⁄
2
LSB and
±
1 LSB
5 V
DC
15 mW
100 µs
Block Diagram
DS005277-1
© 2001 National Semiconductor Corporation
DS005277
www.national.com
NSC [ NATIONAL SEMICONDUCTOR ]
