CDB4923 CDB49300

2

DS262DB2

TABLE OF CONTENTS

1. CDB4923 VS. CDB49300 ......................................................................................................... 5

1.1 DSP Power ........................................................................................................................ 5

1.2 DSP PLL Filter ................................................................................................................... 5

2. OPERATION ............................................................................................................................. 5

2.1 Power Requirements .........................................................................................................6

2.2 Dolby‚ Considerations ........................................................................................................ 7

3. DIGITAL SIGNAL PROCESSOR ............................................................................................. 7

3.1 Control Signals ................................................................................................................... 7

3.2 External Memory ................................................................................................................ 8

4. CONTROL ................................................................................................................................. 8

5. DATA SELECTION ................................................................................................................... 9

5.1 Provided Mode ................................................................................................................. 10

5.1.1 Control ................................................................................................................. 10

5.1.2 Data .....................................................................................................................10

5.1.3 Audio Clocking .................................................................................................... 12

5.2 External Mode .................................................................................................................. 12

6. CLOCKING ............................................................................................................................. 14

6.1 DSP Clock ........................................................................................................................ 14

6.2 MCLK ............................................................................................................................... 15

6.3 LRCLK and SCLK ............................................................................................................ 15

7. INPUT ...................................................................................................................................... 16

7.1 Analog Input ..................................................................................................................... 16

7.2 Digital Input ...................................................................................................................... 16

8. OUTPUT .................................................................................................................................. 17

8.1 Analog Output .................................................................................................................. 17

8.2 Analog Output Protection Circuitry ................................................................................... 17

8.3 Digital Output ................................................................................................................... 17

9. APPENDIX A: SCHEMATICS

...................................................................................... 18

10. APPENDIX D: BILL OF MATERIALS .................................................................................. 34

11. APPENDIX E: EXTERNAL MEMORY SCHEMATICS

..................................................... 37

Contacting Cirrus Logic Support

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http://www.cirrus.com/corporate/contacts/

Dolby is a registered trademark of Dolby Laboratories Licensing Corporation

DTS is a registered trademark of DTS, Inc.

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