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
IDT CONFIDENTIAL
2
V0.6 07/11
ACS32201
©2011 INTEGRATED DEVICE TECHNOLOGY, INC.
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