Datasheet

AD1940/AD1941
Rev. B | Page 2 of 36
TABLE OF CONTENTS
Specifications ..................................................................................... 3
Digital I/O ..................................................................................... 3
Power .............................................................................................. 3
Digital Timing ............................................................................... 4
PLL ................................................................................................. 5
Regulator ........................................................................................ 5
Temperature Range ...................................................................... 5
Absolute Maximum Ratings ............................................................ 6
ESD Caution .................................................................................. 6
Digital Timing Diagrams ................................................................. 7
Pin Configuration and Function Descriptions ............................. 9
Features ............................................................................................ 11
Pin Functions .............................................................................. 12
Signal Processing ............................................................................ 14
Overview ...................................................................................... 14
Numeric Formats ........................................................................ 14
Programming .............................................................................. 14
Control Port ..................................................................................... 15
Overview ...................................................................................... 15
AD1940 SPI Port ........................................................................ 15
AD1941 I
2
C Port ......................................................................... 15
RAMs and Registers ....................................................................... 19
Control Port Addressing ........................................................... 19
Parameter RAM Contents ......................................................... 19
Recommended Program/Parameter Loading Procedures .... 20
Target/ Slew RAM ....................................................................... 20
Safeload Registers ....................................................................... 23
Data Capture Registers .............................................................. 23
DSP Core Control Register ....................................................... 24
RAM Configuration Register ................................................... 25
Control Port Read/Write Data Formats .................................. 25
Serial Data Input/Output Ports .................................................... 28
Serial Output Control Registers ............................................... 30
Serial Input Control Register .................................................... 30
Initialization .................................................................................... 33
Power-Up Sequence ................................................................... 33
Setting Master Clock/PLL Mode .............................................. 33
Volt age Regu lator ....................................................................... 33
Outline Dimensions ....................................................................... 35
Ordering Guide .......................................................................... 35
REVISION HISTORY
4/10—Rev. A to Rev. B
Changes to Voltage Regulator Section ..................................... 34
Updated Outline Dimensions ................................................... 35
Changes to Ordering Guide ...................................................... 35
4/05—Rev. 0 to Rev. A
Added AD1941 .............................................................. Universal
Changes to Specifications ............................................................ 3
Changes to Pin Function Descriptions ...................................... 9
Changes to Features Section...................................................... 11
Changes to Pin Functions Section ............................................ 13
Addition of AD1940 SPI Port Section ..................................... 15
Added Table 13 to Table 16 ....................................................... 18
7/04—Revision 0: Initial Version