
AD1940
TABLE OF CONTENTS
Specifications.....................................................................................3
Rev. 0 | Page 2 of 32
Digital I/O .....................................................................................3
Power..............................................................................................3
Temperature Range......................................................................3
Digital Timing...............................................................................4
PLL .................................................................................................4
Regulator........................................................................................4
Absolute Maximum Ratings............................................................5
ESD Caution..................................................................................5
Digital Timing Diagrams.................................................................6
Pin Configuration and Function Descriptions.............................8
Features............................................................................................10
Pin Functions..............................................................................11
Signal Processing............................................................................13
Overview......................................................................................13
Numeric Formats........................................................................13
Programming..............................................................................13
Control Port.....................................................................................14
Overview......................................................................................14
RAMs and Registers....................................................................... 16
Control Port Addressing............................................................ 16
Parameter RAM Contents......................................................... 16
Recommended Program/Parameter Loading Procedures.... 17
Target/Slew RAM....................................................................... 17
Safeload Registers....................................................................... 19
Data Capture Registers.............................................................. 20
DSP Core Control Register....................................................... 20
RAM Configuration Register ................................................... 21
Control Port Read/Write Data Formats.................................. 22
Serial Data Input/Output Ports.................................................... 24
Serial Output Control Registers............................................... 26
Serial Input Control Register.................................................... 26
Initialization.................................................................................... 29
Power-Up Sequence................................................................... 29
Setting Master Clock/PLL Mode.............................................. 29
Voltage Regulator....................................................................... 29
Outline Dimensions....................................................................... 30
Ordering Guide .......................................................................... 30
REVISION HISTORY
7/04—Revision 0: Initial Version