ADAU1761
TABLE OF CONTENTS
Features .............................................................................................. 1
Playback Signal Path ...................................................................... 35
Output Signal Paths ................................................................... 35
Headphone Output .................................................................... 36
Pop-and-Click Suppression ...................................................... 37
Line Outputs ............................................................................... 37
Control Ports................................................................................... 38
Burst Mode Writing and Reading............................................ 38
I2C Port ........................................................................................ 38
SPI Port........................................................................................ 41
Serial Data Input/Output Ports .................................................... 42
Applications Information.............................................................. 44
Power Supply Bypass Capacitors.............................................. 44
GSM Noise Filter........................................................................ 44
Grounding................................................................................... 44
Exposed Pad PCB Design ......................................................... 44
DSP Core ......................................................................................... 45
Signal Processing........................................................................ 45
Architecture ................................................................................ 45
Program Counter ....................................................................... 45
Features........................................................................................ 45
Startup.......................................................................................... 45
Numeric Formats ....................................................................... 46
Programming.............................................................................. 46
Program RAM, Parameter RAM, and Data RAM..................... 47
Program RAM ............................................................................ 47
Parameter RAM.......................................................................... 47
Data RAM ................................................................................... 47
Read/Write Data Formats ......................................................... 47
Software Safeload ....................................................................... 48
Software Slew.............................................................................. 49
General-Purpose Input/Output.................................................... 50
GPIO Pins Set from the Control Port...................................... 50
Control Registers............................................................................ 51
Control Register Details ............................................................ 52
Outline Dimensions....................................................................... 92
Ordering Guide .......................................................................... 92
Applications....................................................................................... 1
General Description......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 3
Specifications..................................................................................... 4
Analog Performance Specifications........................................... 4
Power Supply Specifications........................................................ 7
Typical Current Consumption.................................................... 8
Typical Power Management Measurements ............................. 9
Digital Filters............................................................................... 10
Digital Input/Output Specifications......................................... 10
Digital Timing Specifications ................................................... 11
Digital Timing Diagrams........................................................... 12
Absolute Maximum Ratings.......................................................... 14
Thermal Resistance .................................................................... 14
ESD Caution................................................................................ 14
Pin Configuration and Function Descriptions........................... 15
Typical Performance Characteristics ........................................... 17
System Block Diagrams ................................................................. 20
Theory of Operation ...................................................................... 23
Startup, Initialization, and Power................................................. 24
Power-Up Sequence ................................................................... 24
Power Reduction Modes............................................................ 24
Digital Power Supply.................................................................. 24
Input/Output Power Supply...................................................... 24
Clock Generation and Management........................................ 24
Clocking and Sampling Rates ....................................................... 26
Core Clock................................................................................... 26
Sampling Rates............................................................................ 27
PLL ............................................................................................... 27
Record Signal Path.......................................................................... 29
Input Signal Paths....................................................................... 29
Analog-to-Digital Converters................................................... 31
Automatic Level Control (ALC)................................................... 32
ALC Parameters.......................................................................... 32
Noise Gate Function .................................................................. 33
Rev. C | Page 2 of 92
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