adc10838ciwm National Semiconductor Corporation, adc10838ciwm Datasheet

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adc10838ciwm

Manufacturer Part Number
adc10838ciwm
Description
10-bit Plus Sign Serial I/o A/d Converters With Mux, Sample/hold And Reference
Manufacturer
National Semiconductor Corporation
Datasheet
C 1995 National Semiconductor Corporation
ADC10831 ADC10832 ADC10834 ADC10838
10-Bit Plus Sign Serial I O A D Converters
with MUX Sample Hold and Reference
General Description
This series of CMOS 10-bit plus sign successive approxima-
tion A D converters features versatile analog input multi-
plexers sample hold and a 2 5V band-gap reference The
1 2 4 or 8-channel multiplexers can be software configured
for single-ended or differential mode of operation
An input sample hold is implemented by a capacitive refer-
ence ladder and sampled-data comparator This allows the
analog input to vary during the A D conversion cycle
In the differential mode valid outputs are obtained even
when the negative inputs are greater than the positive be-
cause of the 10-bit plus sign output data format
The serial I O is configured to comply with the NSC
MICROWIRE
terface to the COPS
and can easily interface with standard shift registers and
microprocessors
Applications
Y
Y
Y
ADC10838 Simplified Block Diagram
COPS
Medical instruments
Remote instrumentation
Test equipment
TM
HPC
TM
and MICROWIRE
TM
serial data exchange standard for easy in-
TM
TM
and HPC
are trademarks of National Semiconductor Corporation
TL H 11391
TM
families of controllers
Features
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Key Specifications
Y
Y
Y
Y
Y
Y
Y
b
Serial I O (MICROWIRE compatible)
1 2 4 or 8-channel differential or single-ended
multiplexer
Software or hardware power down
Analog input sample hold function
Ratiometric or Absolute voltage referencing
No zero or full scale adjustment required
No missing codes over temperature
TTL MOS input output compatible
Standard DIP and SO packages
Resolution
Dual supply
Power dissipation
In power down mode
Conversion time
Sampling rate
Band-gap reference
5V to
a
5V analog voltage range with
RRD-B30M75 Printed in U S A
2 5V
10 bits plus sign
December 1994
g
59 mW (Max)
5V supplies
74 kHz (Max)
g
5 ms (Max)
TL H 11391 – 1
2% (Max)
33 mW
g
5V

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adc10838ciwm Summary of contents

Page 1

... Medical instruments Y Remote instrumentation Y Test equipment Y ADC10838 Simplified Block Diagram COPS TM HPC TM and MICROWIRE TM are trademarks of National Semiconductor Corporation C 1995 National Semiconductor Corporation TL H 11391 Features analog voltage range with Y Serial I O (MICROWIRE compatible 8-channel differential or single-ended Y ...

Page 2

... See NS Package Number N20A or M20B TL H 11391 – 3 See NS Package Number N24A or M24B Package ADC10831CIN N16E ADC10831CIWM M16B ADC10832CIN N20A ADC10832CIWM M20B ADC10834CIN N20A ADC10834CIWM M20B ADC10838CIN N24A ADC10838CIWM M24B 11391 – 4 Top View TL H 11391 – 5 Top View ...

Page 3

... Channel Matching (Notes 1 3) Storage Temperature Operating Ratings Operating Temperature Range ADC10831CIN ADC10831CIWM ADC10832CIN ADC10832CIWM 12V ADC10834CIN ADC10834CIWM ADC10838CIN ADC10838CIWM Positive Supply Voltage Negative Supply Voltage ( ...

Page 4

Electrical Characteristics a The following specifications apply for and MHz unless otherwise specified Boldface limits apply for T DC CLK all other limits T T ...

Page 5

Electrical Characteristics a The following specifications apply for and MHz unless otherwise specified Boldface limits apply for T DC CLK all other limits T T ...

Page 6

Electrical Characteristics a The following specifications apply for and MHz unless otherwise specified Boldface limits apply for T DC CLK all other limits T T ...

Page 7

... ADC10834CIN ADC10834CIWM ADC10838CIN ADC10838CIWM Note 6 The human body model is a 100 pF capacitor discharged through resistor into each pin The machine model is a 200 pF capacitor discharged directly into each pin Note 7 See AN-450 ‘‘Surface Mounting Methods and Their Effect on Product Reliability’’ or the section titied ‘‘Surtace Mount’’ found in any post 1986 National ...

Page 8

Electrical Characteristics (Continued) FIGURE 1B Simplified Error Curve vs Output Code FIGURE 1A Transfer Characteristic 11391 – 11391 – 8 ...

Page 9

Leakage Current Test Circuit TL H 11391 – ...

Page 10

Typical Performance Characteristics a Analog Supply Current ( Temperature a Digital Supply Current ( Clock Frequency Linearity Error vs Clock Frequency 10-Bit Unsigned a Signal-to-Noise THD Ratio vs Input Signal Level a Analog Supply ...

Page 11

Typical Reference Performance Characteristics Load Regulation Output Drift vs Temperature Line Regulation (3 Typical Parts) Available Output Current vs Supply Voltage 11391 – 11 ...

Page 12

TRI-STATE Test Circuits and Waveforms Timing Diagrams TL H 11391 – 11391 – 14 FIGURE 2 DI Timing FIGURE 3 DO Timing 11391 – 11391 – 11391 – ...

Page 13

Timing Diagrams (Continued) FIGURE 5 Hardware Power Up Down Sequence FIGURE 6 Software Power Up Down Sequence FIGURE 4 Delayed DO Timing 11391 – 11391 – 11391 – 20 ...

Page 14

Timing Diagrams (Continued) Note low during power up of the power supply voltages (AV invalid FIGURE 7 ADC10831 CS Low during Conversion a a and DV ) then CS needs to go high for t The data ...

Page 15

Timing Diagrams (Continued) 15 ...

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Timing Diagrams (Continued) 16 ...

Page 17

Timing Diagrams (Continued) 17 ...

Page 18

TABLE I ADC10838 Multiplexer Address Assignment MUX Address MA0 MA1 MA2 MA3 MA4 SING ODD PU SEL1 SEL0 DIFF SIGN ...

Page 19

Pin Descriptions CLK The clock applied to this input controls the suc- cessive approximation conversion time interval the acquisition time and the rate at which the serial data exchange occurs The rising edge loads the information on the DI pin ...

Page 20

Applications Hints The ADC10831 use successive approximation to digitize an analog input voltage The DAC portion of the A D converters uses a capacitive array and a resistive ladder structure The structure of the DAC allows a ...

Page 21

Applications Hints (Continued) 21 ...

Page 22

Applications Hints (Continued APPLICATIONS INFORMATION 3 1 Multiplexer Configuration The design of these converters utilizes a sampled-data comparator structure which allows a differential analog in- put to be converted by the successive approximation rou- tine The actual voltage ...

Page 23

Applications Hints (Continued) 4 Single-Ended FIGURE 12 Analog Input Multiplexer Options a Ratiometric Using the Internal Reference 0 1% Resistors FIGURE 13 Different Reference Configurations 4 Psuedo- 2 Differential Differential b Absolute Using a 4 096V Span ...

Page 24

Applications Hints (Continued Optional Adjustments Zero Error The zero error of the A D converter relates to the location of the first riser of the transfer function (see Figure 1 ) and can be measured ...

Page 25

Applications Hints (Continued (R1 R2 Note 1 Diodes are 1N914 Note 2 The protection diodes should be able to withstand the output current of the op amp under current limit FIGURE 15 Protecting the Analog Inputs ...

Page 26

Physical Dimensions inches (millimeters) Order Number ADC10831CIWM NS Package Number M16B 26 ...

Page 27

Physical Dimensions inches (millimeters) (Continued) Order Number ADC10832CIWM and ADC10834CIWM NS Package Number M20B 27 ...

Page 28

... Physical Dimensions inches (millimeters) (Continued) Order Number ADC10838CIWM NS Package Number M24B Order Number ADC10831CIN NS Package Number N16E 28 ...

Page 29

Physical Dimensions inches (millimeters) (Continued) Order Number ADC10832CIN and ADC10834CIN NS Package Number N20A 29 ...

Page 30

Physical Dimensions inches (millimeters) (Continued) LIFE SUPPORT POLICY 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 OF NATIONAL SEMICONDUCTOR CORPORATION As used herein 1 ...

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