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
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