AD9981
TABLE OF CONTENTS
Analog Interface Specifications ...................................................... 3
Detailed 2-Wire Serial Control Register Descriptions .............. 29
Chip Identification..................................................................... 29
PLL Divider Control .................................................................. 29
Clock Generator Control .......................................................... 29
Phase Adjust................................................................................ 30
Input Gain ................................................................................... 30
Input Offset ................................................................................. 30
Hsync Controls........................................................................... 31
Vsync Controls ........................................................................... 31
Coast and Clamp Controls........................................................ 32
SOG Control ............................................................................... 34
Input and Power Control........................................................... 34
Output Control........................................................................... 35
Two-Wire Serial Control Port....................................................... 40
Data Transfer via Serial Interface............................................. 40
PCB Layout Recommendations ............................................... 42
PLL ............................................................................................... 42
Outline Dimensions....................................................................... 44
Ordering Guide .......................................................................... 44
Absolute Maximum Ratings............................................................ 5
Explanation of Test Levels........................................................... 5
ESD Caution.................................................................................. 5
Pin Configuration and Function Descriptions............................. 6
Design Guide................................................................................... 11
General Description................................................................... 11
Digital Inputs .............................................................................. 11
Input Signal Handling................................................................ 11
Hsync and Vsync Inputs............................................................ 11
Serial Control Port ..................................................................... 11
Output Signal Handling............................................................. 11
Clamping ..................................................................................... 11
Gain and Offset Control............................................................ 12
Timing Diagrams........................................................................ 20
Hsync Timing ............................................................................. 21
Coast Timing............................................................................... 21
Output Formatter ....................................................................... 21
Two-Wire Serial Register Map...................................................... 23
REVISION HISTORY
1/05—Initial Version: Revision 0
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