ADC0819 National Semiconductor, ADC0819 Datasheet

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ADC0819

Manufacturer Part Number
ADC0819
Description
8-Bit Serial I/O A/D Converter with 19-Channel Multiplexer
Manufacturer
National Semiconductor
Datasheet

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C 1995 National Semiconductor Corporation
ADC0819 8-Bit Serial I O A D Converter
with 19-Channel Multiplexer
General Description
The ADC0819 is an 8-Bit successive approximation A D
converter with simultaneous serial I O The serial input con-
trols an analog multiplexer which selects from 19 input
channels or an internal half scale test voltage
An input sample-and-hold is implemented by a capacitive
reference ladder and sampled data comparator This allows
the input signal to vary during the conversion cycle
Separate serial I O and conversion clock inputs are provid-
ed to facilitate the interface to various microprocessors
Features
Y
Y
Y
Connection Diagrams
Molded Chip Carrier (PCC) Package
Order Number ADC0819BCV CCV
Order Number ADC0819BCN CIN
Separate asynchronous converter clock and serial data
I O clock
19-Channel multiplexer with 5-Bit serial address logic
Built-in sample and hold function
See NS Package Number N28B
See NS Package Number V28A
Dual-In-Line Package
Top View
Top View
TL H 9287–20
TL H 9287– 1
TL H 9287
Functional Diagram
Y
Y
Y
Y
Y
Y
Key Specifications
Y
Y
Y
Y
Y
Ratiometric or absolute voltage referencing
No zero or full-scale adjust required
Internally addressable test voltage
0V to 5V input range with single 5V power supply
TTL MOS input output compatible
28-pin molded chip carrier or 28-pin molded DIP
Resolution
Total unadjusted error
Single supply
Low Power
Conversion Time
g
RRD-B30M115 Printed in U S A
LSB and
December 1994
TL H 9287 – 2
g
15 mW
16 s
8-Bits
1LSB
5V
DC

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ADC0819 Summary of contents

Page 1

... ADC0819 8-Bit Serial Converter with 19-Channel Multiplexer General Description The ADC0819 is an 8-Bit successive approximation A D converter with simultaneous serial I O The serial input con- trols an analog multiplexer which selects from 19 input channels or an internal half scale test voltage ...

Page 2

... T MIN MAX Parameter Conditions CONVERTER AND MULTIPLEXER CHARACTERISTICS Maximum Total V REF Unadjusted Error (Note 4) ADC0819BCV BCN ADC0819CCV CIN Minimum Reference Input Resistance Maximum Reference Input Resistance Maximum Analog Input Range (Note 5) Minimum Analog Input Range On Channel Leakage Current (Note 9) ...

Page 3

Electrical Characteristics The following specifications apply for V CC apply from all other limits T MIN MAX Parameter Conditions DIGITAL AND DC CHARACTERISTICS (Continued) V Logical ‘‘1’’ V OUT(1) CC Output Voltage (Min) I OUT I OUT ...

Page 4

Electrical Characteristics otherwise specified Boldface limits apply from T Parameter AC CHARACTERISTICS (Continued) t Analog After Address Is Latched CA Sampling Time CS Low e t Maximum ‘‘TRI-STATE’’ to ‘‘HIGH’’ State e RDO L Rise Time ...

Page 5

Timing Diagrams (Continued) D0 Low to High State Strobing CS High and Low will abort the present conversion and initiate a new serial I O exchange Timing with a gated S Note Strobing CS Low during this time interval will ...

Page 6

Timing Diagrams (Continued) Channel Addressing Table TABLE I ADC 0819 Channel Addressing ...

Page 7

Functional Block Diagram 7 ...

Page 8

... CONTINUOUS S CLK With a continuous S input CS must be used to synchro- CLK nize the serial data exchange (see Figure 1 ) The ADC0819 recognizes a valid CS one to three clock periods after 2 the actual falling edge of CS This is implemented to ensure noise immunity of the CS signal Any spikes on CS less than ...

Page 9

... ANALOG INPUT 2 1 THE INPUT SAMPLE AND HOLD The ADC0819’s sample hold capacitor is implemented in its capacitive ladder structure After the channel address is re- ceived the ladder is switched to sample the proper analog input This sampling mode is maintained for 1 sec after the ...

Page 10

... Ordering Information Temperature Range Total Unadjusted g Error g Package Outline ADC0819 FUNCTIONAL CIRCUIT LSB ADC0819BCN ADC0819BCV 1 LSB ADC0819CCV N28B V28A 9287 – ADC0819CIN N28B ...

Page 11

... Physical Dimensions inches (millimeters) Order Number ADC0819BCN or ADC0819CIN Molded Dual-In-Line Package (N) NS Package Number N28B 11 ...

Page 12

... National does not assume any responsibility for use of any circuitry described no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications Molded Chip Carrier (V) Order Number ADC0819BCV CCV NS Package Number V28A 2 A critical component is any component of a life ...

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