Datasheet

ADAU1381
Rev. B | Page 2 of 84
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 3
Specifications..................................................................................... 4
Record Side Performance Specifications................................... 4
Output Side Performance Specifications................................... 6
Power Supply Specifications........................................................ 8
Typical Power Management Measurements ............................. 9
Digital Filters................................................................................. 9
Digital Input/Output Specifications......................................... 10
Digital Timing Specifications ................................................... 11
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 ...................................................................... 24
Startup, Initialization, and Power................................................. 25
Power-Up Sequence ................................................................... 25
Clock Generation and Management........................................ 26
Enabling Digital Power to Functional Subsystems ................ 26
Setting Up the Sound Engine.................................................... 26
Power Reduction Modes............................................................ 26
Power-Down Sequence.............................................................. 26
Clocking and Sampling Rates ....................................................... 27
Core Clock................................................................................... 27
Sampling Rates............................................................................ 27
PLL ............................................................................................... 28
Record Signal Path.......................................................................... 30
Input Signal Path ........................................................................ 30
Analog-to-Digital Converters................................................... 31
Digital Dual-Band Automatic Level Control (ALC) ............. 31
Playback Signal Path ...................................................................... 32
Output Signal Paths ................................................................... 32
Digital-to-Analog Converters................................................... 32
Line Outputs ............................................................................... 32
Speaker Output........................................................................... 32
Control Ports................................................................................... 33
I
2
C Port ........................................................................................ 33
SPI Port ........................................................................................ 36
Memory and Register Access.................................................... 36
Serial Data Input/Output Ports .................................................... 38
TDM Modes................................................................................ 38
General-Purpose Input/Outputs .................................................. 40
Sound Engine.................................................................................. 41
Signal Processing........................................................................ 41
Processing Flow .......................................................................... 41
Programming.............................................................................. 41
Parameter Memory .................................................................... 41
Applications Information .............................................................. 42
Power Supply Bypass Capacitors.............................................. 42
GSM Noise Filter........................................................................ 42
Grounding................................................................................... 42
Speaker Driver Supply Trace (AVDD2) .................................. 42
Exposed Pad PCB Design ......................................................... 42
Control Register Map..................................................................... 43
Clock Management, Internal Regulator, and PLL Control... 44
Record Path Configuration....................................................... 48
Serial Port Configuration.......................................................... 53
Audio Converter Configuration............................................... 58
Playback Path Configuration.................................................... 63