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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. Sig-

nal 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, ex-

cellent long-term accuracy and repeatability, and consumes

minimal power. These features make this device ideally

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.)

Features

n Easy interface to all microprocessors, or operates “stand

alone”

n Operates ratiometrically or with 5 V

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 Resolution: 8 Bits

n Total Unadjusted Error:

⁄

LSB and

1 LSB

n Single Supply: 5 V

n Low Power: 15 mW

n Conversion Time: 100 µs

TRI-STATE

is a registered trademark of National Semiconductor Corporation.

December 1994

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

1 2 3 4 5 6 ... 13 14

Inhaltsverzeichnis

Seite 1 - Multiplexer

ADC0816/ADC08178-Bit µP Compatible A/D Converters with 16-ChannelMultiplexerGeneral DescriptionThe ADC0816, ADC0817 data acquisition component is amon

Seite 2 - Block Diagram

Applications Information (Continued)DS005277-12FIGURE 10. Ground ReferencedConversion System Using Trimmed SupplyDS005277-13FIGURE 11. Ground Referenc

Seite 3 - Electrical Characteristics

Applications Information (Continued)3.0 CONVERTER EQUATIONSThe transition between adjacent codes N andN+1isgivenby:(2)The center of an output code N i

Seite 4

Typical ApplicationMicroprocessor Interface TablePROCESSOR READ WRITE INTERRUPT (COMMENT)8080 MEMRMEMW INTR (Thru RST Circuit)8085 RDWR INTR (Thru RST

Seite 5 - Functional Description

Physical Dimensions inches (millimeters) unless otherwise notedCavity Dual-In-Line Package (J)NS Package Number J40AMolded Dual-In-Line Package (N)NS

Seite 6 - Timing Diagram

LIFE SUPPORT POLICYNATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DE-VICES OR SYSTEMS WITHOUT THE EXPRESS WRITT

Seite 7 - Connection Diagram

Block DiagramDS005277-1www.national.com 2

Seite 8 - Applications Information

Absolute Maximum Ratings (Notes 1,2)If Military/Aerospace specified devices are required,please contact the National Semiconductor Sales Office/Distri

Seite 9 - Figure 13

Electrical Characteristics (Continued)Digital Levels and DC Specifications: ADC0816CCJ, ADC0816CCN, ADC0817CCN — 4.75V≤VCC≤5.25V, −40˚C≤TA≤+85˚Cunless

Seite 10 - DS005277-14

Functional DescriptionMultiplexer: The device contains a 16-channel single-endedanalog signal multiplexer. A particular input channel is se-lected by

Seite 11 - 11 www.national.com

Functional Description (Continued)Timing DiagramDS005277-3FIGURE 2. 3-Bit A/D Transfer CurveDS005277-4FIGURE 3. 3-Bit A/D Absolute Accuracy CurveDS005

Seite 12 - DS005277-16

Timing Diagram (Continued)The successive approximation register (SAR) performs 8 it-erations to approximate the input voltage. For any SAR typeconvert

Seite 13 - NS Package Number N40A

Typical Performance CharacteristicsTRI-STATE Test Circuits and Timing DiagramsApplications InformationOPERATION1.0 RATIOMETRIC CONVERSIONThe ADC0816,

Seite 14

Applications Information (Continued)A good example of a ratiometric transducer is a potentiom-eter used as a position sensor. The position of the wipe

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