ACS32201 datasheet(2/65 Pages) IDT

2 / 65 page

IDT CONFIDENTIAL

V0.6 07/11

ACS32201

LOW-POWER, HIGH-FIDELITY, CLASS-D AMPLIFIER

TABLE OF CONTENTS

1. OVERVIEW ................................................................................................................................ 2

1.1. Block Diagrams ..................................................................................................................................2

1.2. Audio Outputs ....................................................................................................................................2

2. POWER MANAGEMENT .......................................................................................................... 3

2.1. Control Registers ...............................................................................................................................3

2.2. Stopping the Master Clock .................................................................................................................3

3. OUTPUT AUDIO PROCESSING ............................................................................................... 4

3.1. DC Removal ......................................................................................................................................4

3.2. Volume Control ..................................................................................................................................5

3.3. Digital DAC Volume Control ...............................................................................................................6

3.4. Parametric Equalizer .........................................................................................................................6

3.4.1. Prescaler & Equalizer Filter .................................................................................................6

3.4.2. EQ Registers ........................................................................................................................7

3.4.3. Equalizer, Bass, Treble Coefficient & Equalizer Prescaler RAM .........................................9

3.5. Gain and Dynamic Range Control ...................................................................................................12

3.6. Limiter ..............................................................................................................................................12

3.7. Compressor .....................................................................................................................................13

3.7.1. Configuration ......................................................................................................................14

3.7.2. Controlling parameters .......................................................................................................14

3.7.3. Overview ............................................................................................................................15

3.7.4. Limiter/Compressor Registers ............................................................................................17

3.7.5. Expander Registers ...........................................................................................................19

3.8. Output Effects ..................................................................................................................................20

3.9. Stereo Depth (3-D) Enhancement ...................................................................................................20

3.10. Psychoacoustic Bass Enhancement ..............................................................................................21

3.10.1. Non-linear function ...........................................................................................................21

3.10.2. Signal processing summary .............................................................................................22

3.10.3. Control Points ..................................................................................................................22

3.11. Treble Enhancement .....................................................................................................................23

3.11.1. Enhanced Treble NLF ......................................................................................................23

3.11.2. Signal processing summary .............................................................................................23

3.11.3. Control Points ..................................................................................................................24

3.12. Mute and De-Emphasis .................................................................................................................24

3.13. Mono Operation and Phase Inversion ...........................................................................................24

3.13.1. DAC Control Register .....................................................................................................24

3.14. Analog Outputs ..............................................................................................................................25

3.14.1. Speaker Outputs ..............................................................................................................25

3.14.2. Class D Audio Processing ...............................................................................................25

3.15. Other Output Capabilities ..............................................................................................................31

3.15.1. Audio Output Control .......................................................................................................31

3.15.2. Speaker Enable ...............................................................................................................31

3.15.3. Speaker Operation ...........................................................................................................32

3.16. Thermal Shutdown .........................................................................................................................32

3.16.1. Algorithm description: ......................................................................................................32

3.16.2. Thermal Trip Points. .........................................................................................................33

3.16.3. Temperature Limit State Diagram: ...................................................................................34

3.16.4. Instant Cut Mode ..............................................................................................................34

3.16.5. Short Circuit Protection ....................................................................................................34

3.16.6. Thermal Shutdown Registers ...........................................................................................35

4. DIGITAL AUDIO AND CONTROL INTERFACES ................................................................... 37

4.1. Data Interface ..................................................................................................................................37

4.2. Master and Slave Mode Operation ..................................................................................................37

4.3. Audio Data Formats .........................................................................................................................38

4.4. Left Justified Audio Interface ...........................................................................................................38

4.5. Right Justified Audio Interface (assuming n-bit word length) ...........................................................38

4.6. I2S Format Audio Interface ..............................................................................................................39

4.7. Data Interface Registers ..................................................................................................................39

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