DS686A1

3

CS4270

TABLE OF CONTENTS

1. PIN DESCRIPTIONS - SOFTWARE MODE ............................................................................. 6

2. PIN DESCRIPTIONS - STAND-ALONE MODE ....................................................................... 7

3. CHARACTERISTICS AND SPECIFICATIONS ........................................................................ 8

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

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

THERMAL CHARACTERISTICS.............................................................................................. 8

DAC ANALOG CHARACTERISTICS (CS4270-CZZ)............................................................... 9

DAC ANALOG CHARACTERISTICS (CS4270-DZZ)............................................................... 9

DAC COMBINED INTERPOLATION & ON-CHIP ANALOG FILTER RESPONSE................ 11

ADC ANALOG CHARACTERISTICS (CS4270-CZZ)............................................................. 12

ADC ANALOG CHARACTERISTICS (CS4270-DZZ)............................................................. 13

ADC ANALOG CHARACTERISTICS - ALL MODES ............................................................. 14

ADC DIGITAL FILTER CHARACTERISTICS ........................................................................ 14

DC ELECTRICAL CHARACTERISTICS ................................................................................ 15

DIGITAL CHARACTERISTICS............................................................................................... 16

SWITCHING CHARACTERISTICS - SERIAL AUDIO PORT................................................. 16

SWITCHING CHARACTERISTICS - I²C MODE CONTROL PORT....................................... 19

SWITCHING CHARACTERISTICS - SPI CONTROL PORT.................................................. 20

4. TYPICAL CONNECTION DIAGRAM ..................................................................................... 21

5. APPLICATIONS ..................................................................................................................... 22

5.1 Stand-Alone Mode ...........................................................................................................22

5.1.1 Recommended Power-Up Sequence ................................................................. 22

5.1.2 Master/Slave Mode ............................................................................................. 22

5.1.3 System Clocking ................................................................................................. 22

5.1.4 Clock Ratio Selection .......................................................................................... 23

5.1.5 Interpolation Filter .............................................................................................. 23

5.1.6 High-Pass Filter .................................................................................................. 23

5.1.7 Mode Selection & De-Emphasis ......................................................................... 24

5.1.8 Serial Audio Interface Format Selection ............................................................. 24

5.2 Control Port Mode ........................................................................................................... 24

5.2.1 Recommended Power-Up Sequence - Access to Control Port Mode ................ 24

5.2.2 Master / Slave Mode Selection ........................................................................... 24

5.2.3 System Clocking ................................................................................................. 25

5.2.4 Clock Ratio Selection .......................................................................................... 25

5.2.5 Internal Digital Loopback .................................................................................... 26

5.2.6 Auto-Mute ........................................................................................................... 26

5.2.7 High-Pass Filter and DC Offset Calibration ........................................................ 26

5.2.8 De-Emphasis ...................................................................................................... 27

5.2.9 Oversampling Modes .......................................................................................... 27

5.3 De-Emphasis Filter .......................................................................................................... 27

5.4 Analog Connections ........................................................................................................ 28

5.4.1 Input Connections ............................................................................................... 28

5.4.2 Output Connections ............................................................................................ 29

5.5 Mute Control .................................................................................................................... 29

5.6 Synchronization of Multiple Devices ................................................................................ 30

5.7 Grounding and Power Supply Decoupling ....................................................................... 30

6. CONTROL PORT INTERFACE .............................................................................................. 31

6.1 SPI™ Mode ..................................................................................................................... 31

6.2 I²C Mode .......................................................................................................................... 32

7. REGISTER QUICK REFERENCE .......................................................................................... 33

8. REGISTER DESCRIPTION .................................................................................................... 34

8.1 Chip ID - Address 01h ..................................................................................................... 34