CS4245 datasheet(3/54 Pages) CIRRUS

3 / 54 page

CS4245

TABLE OF CONTENTS

1. PIN DESCRIPTIONS ............................................................................................................... 5

2. CHARACTERISTICS AND SPECIFICATIONS ....................................................................... 8

SPECIFIED OPERATING CONDITIONS ................................................................................. 8

ABSOLUTE MAXIMUM RATINGS ........................................................................................... 8

DAC ANALOG CHARACTERISTICS ....................................................................................... 9

DAC COMBINED INTERPOLATION & ON-CHIP ANALOG FILTER RESPONSE................ 10

ADC ANALOG CHARACTERISTICS ..................................................................................... 12

ADC ANALOG CHARACTERISTICS ..................................................................................... 14

ADC DIGITAL FILTER CHARACTERISTICS......................................................................... 15

AUXILIARY OUTPUT ANALOG CHARACTERISTICS .......................................................... 16

AUXILIARY OUTPUT ANALOG CHARACTERISTICS (CONT’D) ......................................... 17

AUXILIARY OUTPUT ANALOG CHARACTERISTICS (CONT’D) ......................................... 18

DC ELECTRICAL CHARACTERISTICS ................................................................................ 19

DIGITAL INTERFACE CHARACTERISTICS ......................................................................... 20

SWITCHING CHARACTERISTICS - SERIAL AUDIO PORT 1.............................................. 21

SWITCHING CHARACTERISTICS - SERIAL AUDIO PORT 2.............................................. 23

SWITCHING CHARACTERISTICS - CONTROL PORT - I²C FORMAT ................................ 26

SWITCHING CHARACTERISTICS - CONTROL PORT - SPI FORMAT ............................... 27

3. TYPICAL CONNECTION DIAGRAM .................................................................................... 28

4. APPLICATIONS .................................................................................................................... 29

4.1 Recommended Power-Up Sequence ............................................................................. 29

4.2 System Clocking ............................................................................................................. 29

4.2.1 Synchronous / Asynchronous Mode .................................................................. 29

4.2.2 Master Clock ...................................................................................................... 29

4.2.3 Master Mode ...................................................................................................... 30

4.2.4 Slave Mode ........................................................................................................ 30

4.3 High Pass Filter and DC Offset Calibration .................................................................... 31

4.4 Analog Input Multiplexer, PGA, and Mic Gain ................................................................ 31

4.5 Input Connections ........................................................................................................... 32

4.6 Output Connections ........................................................................................................32

4.7 Output Transient Control ................................................................................................ 32

4.7.1 Power-up ............................................................................................................ 32

4.7.2 Power-down ....................................................................................................... 32

4.7.3 Serial Interface Clock Changes ......................................................................... 32

4.8 Auxiliary Analog Output .................................................................................................. 32

4.9 De-Emphasis Filter ......................................................................................................... 33

4.10 Internal Digital Loopback .............................................................................................. 33

4.11 Mute Control ................................................................................................................. 33

4.12 Control Port Description and Timing ............................................................................. 34

4.12.1 SPI Mode ......................................................................................................... 34

4.12.2 I²C Mode .......................................................................................................... 35

4.13 Interrupts and Overflow ................................................................................................ 37

4.14 Reset ........................................................................................................................... 37

4.15 Synchronization of Multiple Devices ............................................................................. 37

4.16 Grounding and Power Supply Decoupling .................................................................... 37

5. REGISTER QUICK REFERENCE ......................................................................................... 38

6. REGISTER DESCRIPTION ................................................................................................... 39

6.1 Chip ID - Register 01h ....................................................................................................39

6.2 Power Control - Address 02h ......................................................................................... 39

6.3 DAC Control - Address 03h ............................................................................................ 40

6.4 ADC Control - Address 04h ............................................................................................ 41

6.5 MCLK Frequency - Address 05h .................................................................................... 42

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