ACS522x01
LOW-POWER, HIGH-FIDELITY, INTEGRATED CODEC
TABLE OF CONTENTS
1. OVERVIEW ................................................................................................................................ 7
1.1. Block Diagram ...................................................................................................................................7
1.2. Audio Outputs ....................................................................................................................................7
1.3. Audio Inputs .......................................................................................................................................8
2. POWER MANAGEMENT .......................................................................................................... 9
2.1. Control Registers ...............................................................................................................................9
2.2. Stopping the Master Clock .................................................................................................................9
3. OUTPUT AUDIO PROCESSING ............................................................................................. 10
3.1. DC Removal ....................................................................................................................................10
3.2. Volume Control ................................................................................................................................11
3.3. Digital DAC Volume Control .............................................................................................................12
3.4. Parametric Equalizer .......................................................................................................................12
3.4.1. Prescaler & Equalizer Filter ...............................................................................................12
3.4.2. EQ Registers ......................................................................................................................13
3.4.3. Equalizer, Bass, Treble Coefficient & Equalizer Prescaler RAM .......................................15
3.5. Gain and Dynamic Range Control ...................................................................................................18
3.6. Limiter ..............................................................................................................................................18
3.7. Compressor .....................................................................................................................................19
3.7.1. Configuration ......................................................................................................................20
3.7.2. Controlling parameters .......................................................................................................20
3.7.3. Overview ............................................................................................................................21
3.7.4. Limiter/Compressor Registers ............................................................................................23
3.7.5. Expander Registers ...........................................................................................................25
3.8. Output Effects ..................................................................................................................................26
3.9. Stereo Depth (3-D) Enhancement ...................................................................................................26
3.10. Psychoacoustic Bass Enhancement ..............................................................................................27
3.11. Treble Enhancement .....................................................................................................................27
3.12. Mute and De-Emphasis .................................................................................................................28
3.13. Mono Operation and Phase Inversion ...........................................................................................29
3.13.1. DAC Control Register .....................................................................................................29
3.13.2. Interpolation and Filtering ................................................................................................30
3.14. Analog Outputs ..............................................................................................................................31
3.14.1. Headphone Output ...........................................................................................................31
3.15. Other Output Capabilities ..............................................................................................................32
3.15.1. Audio Output Control .......................................................................................................32
3.15.2. Headphone Switch ...........................................................................................................32
3.15.3. Headphone Operation ......................................................................................................33
3.15.4. EQ Operation ...................................................................................................................33
4. INPUT AUDIO PROCESSING ................................................................................................. 34
4.1. Analog Inputs ...................................................................................................................................34
4.1.1. Input Registers ...................................................................................................................35
4.2. Mono Mixing and Output Configuration ...........................................................................................35
4.2.1. ADC Registers ...................................................................................................................36
4.3. Microphone Bias ..............................................................................................................................37
4.3.1. Microphone Bias Control Register .....................................................................................37
4.4. Programmable Gain Control ............................................................................................................37
4.4.1. Input PGA Software Control Register. ...............................................................................38
4.5. ADC Digital Filter .............................................................................................................................38
4.5.1. ADC Signal Path Control Register .....................................................................................40
4.5.2. ADC High Pass Filter Enable modes .................................................................................40
4.6. Digital ADC Volume Control .............................................................................................................40
4.6.1. ADC Digital Registers ........................................................................................................41
4.7. Automatic Level Control (ALC) ........................................................................................................41
4.7.1. ALC Operation ..................................................................................................................41
4.7.2. ALC Registers ....................................................................................................................43
4.7.3. Peak Limiter .......................................................................................................................44
4.7.4. Input Threshold ..................................................................................................................44
2
V0.5 04/11
©2011 INTEGRATED DEVICE TECHNOLOGY, INC.
ACS522X01
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