ACS42200 datasheet(2/89 Pages) IDT

2 / 89 page

V1.2 1/12

ACS422X00

ACS422x00

LOW-POWER, HIGH-FIDELITY, INTEGRATED CODEC

TABLE OF CONTENTS

1. OVERVIEW ................................................................................................................................ 8

1.1. Block Diagram ...................................................................................................................................8

1.2. Audio Outputs ....................................................................................................................................8

1.3. Audio Inputs .......................................................................................................................................9

1.4. On-Chip PLLs ....................................................................................................................................9

2. POWER MANAGEMENT ........................................................................................................ 10

2.1. Control Registers .............................................................................................................................10

2.2. Stopping the Master Clock ...............................................................................................................11

3. OUTPUT AUDIO PROCESSING ............................................................................................. 12

3.1. DC Removal ....................................................................................................................................12

3.2. Volume Control ................................................................................................................................13

3.3. Digital DAC Volume Control .............................................................................................................14

3.4. Parametric Equalizer .......................................................................................................................14

3.4.1. Prescaler & Equalizer Filter ...............................................................................................15

3.4.2. EQ Registers ......................................................................................................................16

3.4.3. Equalizer, Bass, Treble Coefficient & Equalizer Prescaler RAM .......................................17

3.5. Gain and Dynamic Range Control ...................................................................................................20

3.6. Limiter ..............................................................................................................................................21

3.7. Compressor .....................................................................................................................................21

3.7.1. Configuration ......................................................................................................................22

3.7.2. Controlling parameters .......................................................................................................23

3.7.3. Overview ............................................................................................................................23

3.7.4. Limiter/Compressor Registers ............................................................................................25

3.7.5. Expander Registers ...........................................................................................................27

3.8. Output Effects ..................................................................................................................................28

3.9. Stereo Depth (3-D) Enhancement ...................................................................................................28

3.10. Psychoacoustic Bass Enhancement ..............................................................................................29

3.11. Treble Enhancement .....................................................................................................................30

3.12. Mute and De-Emphasis .................................................................................................................31

3.13. Mono Operation and Phase Inversion ...........................................................................................31

3.13.1. DAC Control Register .....................................................................................................31

3.13.2. Interpolation and Filtering ................................................................................................32

3.14. Analog Outputs ..............................................................................................................................33

3.14.1. Headphone Output ...........................................................................................................33

3.14.2. Speaker Outputs ..............................................................................................................34

3.14.3. DDXTMClass D Audio Processing ....................................................................................34

3.15. Other Output Capabilities ..............................................................................................................39

3.15.1. Audio Output Control .......................................................................................................40

3.15.2. Headphone Switch ...........................................................................................................40

3.15.3. Headphone Operation ......................................................................................................41

3.15.4. EQ Operation ...................................................................................................................41

3.16. Thermal Shutdown .........................................................................................................................42

3.16.1. Algorithm description: ......................................................................................................42

3.16.2. Thermal Trip Points. .........................................................................................................42

3.16.3. Temperature Limit State Diagram: ...................................................................................43

3.16.4. Instant Cut Mode ..............................................................................................................43

3.16.5. Short Circuit Protection ....................................................................................................44

3.16.6. Thermal Shutdown Registers ...........................................................................................44

4. INPUT AUDIO PROCESSING ................................................................................................. 47

4.1. Analog Inputs ...................................................................................................................................47

4.1.1. Input Registers ...................................................................................................................48

4.2. Mono Mixing and Output Configuration ...........................................................................................48

4.2.1. ADC Registers ...................................................................................................................49

4.3. Microphone Bias ..............................................................................................................................50

4.3.1. Microphone Bias Control Register .....................................................................................50

4.4. Programmable Gain Control ............................................................................................................50

4.4.1. Input PGA Software Control Register. ...............................................................................51

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