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AS1543/44

Data Sheet

1 General Description ................................................................................................................................ 1

2 Key Features .......................................................................................................................................... 1

3 Applications ............................................................................................................................................ 1

4 Pinout ..................................................................................................................................................... 3

Pin Assignments ..................................................................................................................................................... 3

Pin Descriptions ..................................................................................................................................................... 3

5 Absolute Maximum Ratings .................................................................................................................... 4

6 Electrical Characteristics ........................................................................................................................ 5

Timing Specifications .............................................................................................................................................. 8

7 Typical Operating Characteristics ........................................................................................................... 9

8 Detailed Description ............................................................................................................................. 12

Converter Operation ............................................................................................................................................. 12

Analog Input ......................................................................................................................................................... 13

Track/Hold ..................................................................................................................................................... 13

Control Register ................................................................................................................................................... 14

Analog Input Configuration ............................................................................................................................ 15

Input Channel Selection ................................................................................................................................ 15

Transfer Functions ........................................................................................................................................ 16

Two’s Complement Transfer Function ........................................................................................................... 16

Power Mode Selection .................................................................................................................................. 17

Sequencer Operation .................................................................................................................................... 17

Shadow Register .................................................................................................................................................. 18

Direct Conversion (SEQ = 0, SHADOW = 0) ................................................................................................ 18

Shadow Register Conversion (SEQ = 0, SHADOW = 1) .............................................................................. 19

Channel Counter Conversion (SEQ = 1, SHADOW = 1) ............................................................................... 20

Serial Interface ..................................................................................................................................................... 20

Power Modes ....................................................................................................................................................... 22

Normal Mode (PM1 = 1, PM0 = 1) ................................................................................................................ 22

Auto Shutdown (PM1 = 0, PM0 = X) ............................................................................................................. 23

Power vs. Throughput Rate .................................................................................................................................. 23

VDRIVE ................................................................................................................................................................ 24

External Reference ............................................................................................................................................... 24

9 Application Information ......................................................................................................................... 25

Initialisation ........................................................................................................................................................... 25

Grounding and Layout Considerations ................................................................................................................. 26

10 Package Drawings and Markings ....................................................................................................... 27

11 Ordering Information .......................................................................................................................... 28