Datasheet

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ADAU1772 Data Sheet

Rev. B | Page 2 of 116

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications ....................................................................................... 1

General Description ......................................................................... 1

Functional Block Diagram .............................................................. 1

Revision History ............................................................................... 3

Specifications ..................................................................................... 4

Analog Performance Specifications ........................................... 4

Crystal Amplifier Specifications ................................................. 7

Digital Input/Output Specifications........................................... 8

Power Supply Specifications........................................................ 8

Typical Power Consumption....................................................... 9

Digital Filters ................................................................................. 9

Digital Timing Specifications ................................................... 10

Absolute Maximum Ratings .......................................................... 14

Thermal Resistance .................................................................... 14

ESD Caution ................................................................................ 14

Pin Configuration and Function Descriptions ........................... 15

Typical Performance Characteristics ........................................... 17

System Block Diagrams ................................................................. 27

Theory of Operation ...................................................................... 28

System Clocking and Power-Up ................................................... 29

Clock Initialization ..................................................................... 29

PLL................................................................................................ 29

Clock Output ............................................................................... 30

Power Sequencing ...................................................................... 30

Signal Routing ................................................................................. 31

Input Signal Paths ........................................................................... 32

Analog Inputs .............................................................................. 32

Digital Microphone Input ......................................................... 33

Analog-to-Digital Converters ................................................... 33

Output Signal Paths ........................................................................ 34

Analog Outputs........................................................................... 34

Digital-to-Analog Converters ................................................... 34

PDM Output ............................................................................... 34

Asynchronous Sample Rate Converters .................................. 35

Signal Levels ................................................................................ 35

Signal Processing ............................................................................ 36

Instructions ................................................................................. 36

Data Memory .............................................................................. 36

Parameters ................................................................................... 36

Control Port .................................................................................... 39

C Port ........................................................................................ 39

SPI Port ........................................................................................ 42

Self-Boot ...................................................................................... 43

Multipurpose Pins .......................................................................... 44

Push-Button Volume Controls ................................................. 44

Limiter Compression Enable .................................................... 44

Parameter Bank Switching ........................................................ 44

Mute ............................................................................................. 44

DSP Bypass Mode ...................................................................... 45

Serial Data Input/Output Ports .................................................... 46

Tristating Unused Channels ..................................................... 46

Applications Information .............................................................. 49

Power Supply Bypass Capacitors .............................................. 49

Layout .......................................................................................... 49

Grounding ................................................................................... 49

Exposed Pad PCB Design ......................................................... 49

Clock Control Register .............................................................. 52

PLL Denominator MSB Register .............................................. 53

PLL Denominator LSB Register ............................................... 53

PLL Numerator MSB Register .................................................. 53

PLL Numerator LSB Register .................................................... 54

PLL Integer Setting Register ..................................................... 54

PLL Lock Flag Register .............................................................. 55

CLKOUT Setting Selection Register ........................................ 55

Regulator Control Register ....................................................... 56

Core Control Register ................................................................ 57

Filter Engine and Limiter Control Register ............................ 58

DB Value Register 0 Read .......................................................... 59

DB Value Register 1 Read .......................................................... 59

DB Value Register 2 Read .......................................................... 60

Core Channel 0/Core Channel 1 Input Select Register ......... 61

Core Channel 2/Core Channel 3 Input Select Register ......... 62

DAC Input Select Register ........................................................ 63

PDM Modulator Input Select Register .................................... 64

Serial Data Output 0/Serial Data Output 1 Input Select