National Semiconductor ADC0816 ADC0817 8-Bit µP Compatible AD Converters with 16-Channel Multiplexer

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0816/A 8-B it µP om patible /D onverters ith 16-C hannel M ultiplexer

ADC0816/ADC0817 8-Bit µP Compatible A/D Converters with 16-Channel Multiplexer General Description Features

The ADC0816, ADC0817 data acquisition component is Easy interface to all microprocessors

monolithic CMOS device with an 8-bit analog-to-digital con- Operates ratiometrically or with VDC or analog span verter, 16-channel multiplexer and microprocessor compat- adjusted voltage reference ible control logic. The 8-bit A/D converter uses successive 16-channel multiplexer with latched control logic approximation as the conversion technique. The converter Outputs meet TTL voltage level specifications features high impedance chopper stabilized comparator,

0V to 5V analog input voltage range with single 5V

256R voltage divider with analog switch tree and succes-

supply

sive approximation register. The 16-channel multiplexer can

No zero or full-scale adjust required

directly access any one of 16-single-ended analog signals,

Standard hermetic or molded 40-pin DIP package

and provides the logic for additional channel expansion. Sig-

Temperature range −40˚C to +85˚C or −55˚C to +125˚C

nal conditioning of any analog input signal is eased by direct

access to the multiplexer output, and to the input of the 8-bit Latched TRI-STATE output A/D converter. Direct access to “comparator in” and “multiplexer out” for signal conditioning

The device eliminates the need for external zero and

full-scale adjustments. Easy interfacing to microprocessors ADC0816 equivalent to MM74C948 is provided by the latched and decoded multiplexer address ADC0817 equivalent to MM74C948-1

inputs and latched TTL TRI-STATE® outputs.

The design of the ADC0816, ADC0817 has been optimized Key Specifications

by incorporating the most desirable aspects of several A/D Resolution Bits conversion techniques. The ADC0816, ADC0817 offers high

Total Unadjusted Error ±1⁄2 LSB and ±1 LSB

speed, high accuracy, minimal temperature dependence, ex-

Single Supply VDC

cellent long-term accuracy and repeatability, and consumes

Low Power m W

minimal power. These features make this device ideally

Conversion Time µs

suited to applications from process and machine control to consumer and automotive applications. For similar perfor- mance in an 8-channel, 28-pin, 8-bit A/D converter, see the ADC0808, ADC0809 data sheet. (See AN-258 for more in- formation.)

Block Diagram

DS005277-1

TRI-STATE® is registered trademark of National Semiconductor Corporation.

National Semiconductor Corporation DS005277 www.national.com