User Manual

DS656F3 3
CS4245
TABLE OF CONTENTS
1. PIN DESCRIPTIONS ........................................................................................................................ 7
2. CHARACTERISTICS AND SPECIFICATIONS ...................................................................................... 9
SPECIFIED OPERATING CONDITIONS ............................................................................................. 9
ABSOLUTE MAXIMUM RATINGS .......................................................................................................9
DAC ANALOG CHARACTERISTICS ................................................................................................. 10
DAC COMBINED INTERPOLATION & ON-CHIP ANALOG FILTER RESPONSE ............................ 11
ADC ANALOG CHARACTERISTICS ................................................................................................. 13
ADC ANALOG CHARACTERISTICS ................................................................................................. 15
ADC DIGITAL FILTER CHARACTERISTICS ..................................................................................... 16
AUXILIARY OUTPUT ANALOG CHARACTERISTICS ...................................................................... 17
AUXILIARY OUTPUT ANALOG CHARACTERISTICS ...................................................................... 18
AUXILIARY OUTPUT ANALOG CHARACTERISTICS ...................................................................... 19
DC ELECTRICAL CHARACTERISTICS ............................................................................................. 20
DIGITAL INTERFACE CHARACTERISTICS ...................................................................................... 21
SWITCHING CHARACTERISTICS - SERIAL AUDIO PORT 1 .......................................................... 22
SWITCHING CHARACTERISTICS - SERIAL AUDIO PORT 2 .......................................................... 24
SWITCHING CHARACTERISTICS - CONTROL PORT - I²C FORMAT ............................................ 27
SWITCHING CHARACTERISTICS - CONTROL PORT - SPI FORMAT ........................................... 28
3. TYPICAL CONNECTION DIAGRAM ................................................................................................... 29
4. APPLICATIONS ................................................................................................................................... 30
4.1 Recommended Power-Up Sequence ............................................................................................. 30
4.2 System Clocking ............................................................................................................................. 30
4.2.1 Synchronous / Asynchronous Mode ...................................................................................... 30
4.2.2 Master Clock ......................................................................................................................... 30
4.2.3 Master Mode ......................................................................................................................... 32
4.2.4 Slave Mode ........................................................................................................................... 32
4.3 High-Pass Filter and DC Offset Calibration .................................................................................... 32
4.4 Analog Input Multiplexer, PGA, and Mic Gain ................................................................................34
4.5 Input Connections ........................................................................................................................... 34
4.6 Output Connections ........................................................................................................................ 34
4.7 Output Transient Control ................................................................................................................ 35
4.7.1 Power-Up .............................................................................................................................. 35
4.7.2 Power-Down .......................................................................................................................... 35
4.7.3 Serial Interface Clock Changes ............................................................................................. 35
4.8 Auxiliary Analog Output .................................................................................................................. 35
4.9 De-Emphasis Filter ......................................................................................................................... 35
4.10 Internal Digital Loopback .............................................................................................................. 36
4.11 Mute Control ................................................................................................................................. 36
4.12 Control Port Description and Timing ............................................................................................. 37
4.12.1 SPI Mode ............................................................................................................................. 37
4.12.2 I²C Mode .............................................................................................................................. 38
4.13 Interrupts and Overflow ................................................................................................................ 39
4.14 Reset ............................................................................................................................................ 40
4.15 Synchronization of Multiple Devices ............................................................................................. 40
4.16 Grounding and Power Supply Decoupling .................................................................................... 40
5. REGISTER QUICK REFERENCE ........................................................................................................ 41
6. REGISTER DESCRIPTION .................................................................................................................. 42
6.1 Chip ID - Register 01h .................................................................................................................... 42
6.2 Power Control - Address 02h ......................................................................................................... 42
6.2.1 Freeze (Bit 7) ......................................................................................................................... 42
6.2.2 Power-Down MIC (Bit 3) ........................................................................................................ 42
6.2.3 Power-Down ADC (Bit 2) .............................
.......................................................................... 42