ADC0816CCJ National Semiconductor, ADC0816CCJ Datasheet

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ADC0816CCJ

Manufacturer Part Number
ADC0816CCJ
Description
8-Bit P Compatible A/D Converters with 16-Channel Multiplexer
Manufacturer
National Semiconductor
Datasheet
© 1999 National Semiconductor Corporation
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
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.)
Block Diagram
TRI-STATE
®
is a registered trademark of National Semiconductor Corporation.
®
outputs.
DS005277
Features
n Easy interface to all microprocessors
n Operates ratiometrically or with 5 V
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
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
n ADC0816 equivalent to MM74C948
n ADC0817 equivalent to MM74C948-1
Key Specifications
n Resolution
n Total Unadjusted Error
n Single Supply
n Low Power
n Conversion Time
adjusted voltage reference
supply
signal conditioning
DS005277-1
DC
±
1
2
or analog span
LSB and
www.national.com
June 1999
±
15 mW
100 µs
1 LSB
5 V
8 Bits
DC

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ADC0816CCJ Summary of contents

Page 1

... A/D converter, see the ADC0808, ADC0809 data sheet. (See AN-258 for more in- formation.) Block Diagram TRI-STATE ® registered trademark of National Semiconductor Corporation. © 1999 National Semiconductor Corporation DS005277 Features n Easy interface to all microprocessors n Operates ratiometrically or with 5 V ...

Page 2

... Connection Diagram Order Number ADC0816CCN or ADC0817CCN Ordering Information TEMPERATURE RANGE ± Error 1 ⁄ Bit Unadjusted 2 ± 1 Bit Unadjusted Package Outline www.national.com Dual-In-Line Package DS005277-6 See NS Package Number N40A −40˚C to +85˚C ADC0816CCN ADC0817CCN N40A Molded DIP 2 ADC0816CCJ J40A Hermetic DIP ...

Page 3

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (V ) (Note 3) CC Voltage at Any Pin −0. Except Control Inputs Voltage at Control Inputs (START, OE, CLOCK, ALE, EXPANSION CONTROL, ADD A, ADD B, ADD C, ADD D) Storage Temperature Range = 25˚ ...

Page 4

Electrical Characteristics Digital Levels and DC Specifications: ADC0816CCN, ADC0817CCN — 4.75V V wise noted. Symbol Parameter CONTROL INPUTS V Logical “1” Input Voltage IN(1) V Logical “0” Input Voltage IN(0) I Logical “1” Input Current IN(1) (The Control Inputs) I ...

Page 5

Functional Description Multiplexer: The device contains a 16-channel single-ended analog signal multiplexer. A particular input channel is se- lected by using the address decoder. Table 1 shows the input states for the address line and the expansion control line to ...

Page 6

Functional Description FIGURE 2. 3-Bit A/D Transfer Curve Timing Diagram www.national.com (Continued) FIGURE 3. 3-Bit A/D Absolute Accuracy Curve DS005277-3 FIGURE 4. Typical Error Curve FIGURE 5. 6 DS005277-4 DS005277-5 DS005277-7 ...

Page 7

Timing Diagram (Continued) The successive approximation register (SAR) performs 8 it- erations to approximate the input voltage. For any SAR type converter, n-iterations are required for an n-bit converter. Figure 2 shows a typical example of a 3-bit converter. In ...

Page 8

Typical Performance Characteristics FIGURE 6. Comparator 5V REF TRI-STATE Test Circuits and Timing Diagrams Applications Information OPERATION 1.0 RATIOMETRIC CONVERSION The ADC0816, ADC0817 is designed as a complete Data Acquisition System (DAS) for ...

Page 9

Applications Information (Continued) A good example of a ratiometric transducer is a potentiom- eter used as a position sensor. The position of the wiper is di- rectly proportional to the output voltage which is a ratio of the full-scale voltage ...

Page 10

Applications Information FIGURE 11. Ground Referenced Conversion System with FIGURE 12. Typical Reference and Supply Circuit www.national.com (Continued) FIGURE 10. Ground Referenced Conversion System Using Trimmed Supply Reference Generating V Supply CC 10 DS005277-12 DS005277-13 DS005277-14 ...

Page 11

Applications Information (Continued) FIGURE 13. Symmetrically Centered Reference 3.0 CONVERTER EQUATIONS The transition between adjacent codes N and given by: The center of an output code N is given by: The output code N for an ...

Page 12

Typical Application *Address latches needed for 8085 and SC/MP interfacing the ADC0816 microprocessor Microprocessor Interface Table PROCESSOR READ 8080 MEMR 8085 RD Z-80 RD SC/MP NRDS 6800 VMA • 2 • R/W www.national.com WRITE INTERRUPT (COMMENT) MEMW ...

Page 13

... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...

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