ADAU1978
Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
SPI Mode ..................................................................................... 25
Register Summary .......................................................................... 27
Register Details ............................................................................... 28
Master Power and Soft Reset Register..................................... 28
PLL Control Register ................................................................. 29
Block Power Control and Serial Port Control Register......... 30
Serial Port Control Register 1................................................... 31
Serial Port Control Register 2................................................... 32
Applications....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Analog Performance Specifications ........................................... 3
Digital Input/Output Specifications........................................... 3
Power Supply Specifications........................................................ 4
Digital Filter Specifications......................................................... 4
Timing Specifications .................................................................. 5
Absolute Maximum Ratings............................................................ 7
Thermal Resistance ...................................................................... 7
ESD Caution.................................................................................. 7
Pin Configuration and Function Descriptions............................. 8
Typical Performance Characteristics ........................................... 10
Theory of Operation ...................................................................... 12
Overview...................................................................................... 12
Power Supply and Voltage Reference....................................... 12
Power-On Reset Sequence ........................................................ 12
PLL and Clock............................................................................. 13
Analog Inputs.............................................................................. 14
ADC ............................................................................................. 16
ADC Summing Modes .............................................................. 16
Serial Audio Data Output Ports, Data Format ....................... 17
Control Ports................................................................................... 21
I2C Mode...................................................................................... 22
Channel 1 and Channel 2 Mapping for Output Serial Ports
Register ........................................................................................ 33
Channel 3 and Channel 4 Mapping for Output Serial Ports
Register ........................................................................................ 35
Serial Output Drive and Overtemperature Protection Control
Register ........................................................................................ 36
Post ADC Gain Channel 1 Control Register.......................... 37
Post ADC Gain Channel 2 Control Register.......................... 38
Post ADC Gain Channel 3 Control Register.......................... 38
Post ADC Gain Channel 4 Control Register.......................... 39
High-Pass Filter and DC Offset Control Register and Master
Mute Register.............................................................................. 40
ADC Clipping Status Register .................................................. 41
Digital DC High-Pass Filter and Calibration Register.......... 42
Typical Application Circuit........................................................... 43
Outline Dimensions....................................................................... 44
Ordering Guide .......................................................................... 44
Automotive Products................................................................. 44
REVISION HISTORY
5/13—Revision 0: Initial Version
Rev. 0 | Page 2 of 44
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