DATASHEET PORTABLE CONSUMER CODEC ACS422x67 LOW-POWER, HIGH-FIDELITY INTEGRATED CODEC The ACS422x67 is a low-power, high-fidelity integrated FEATURES CODEC targeted at portable applications such as tablet High fidelity 24-bit stereo CODEC computers, personal navigation devices, portable projec- DAC 102dB SNR THD+N better than -82dB tors and speaker docks. In addition to a high-fidelity ADC 90dB SNR, THD + N better than -80dB TM low-power CODEC, the device integrates a stereo DDX Built in audio controls and processing Class D speaker amplifier and a true cap-less headphone 3D stereo enhancement amplifier. Beyond high-fidelity for portable systems, the Dual (cascaded) stereo 6-band parametric equalizers device offers an enriched audio presence through built-in Programmable Compressor/Limiter/Expander audio processing capability. Psychoacoustic Bass and Treble enhancement processing TM Filterless Stereo DDX Class D TARGET APPLICATIONS Speaker Driver 1W/channel (8 ) or 2W/channel Tablet Computers (4), 0.05% THD+N typical Portable Navigation Devices TM Tri-state DDX Class D achieves low EMI and high Personal Media Players efficiency >80% efficiency at 1W Portable Projectors Spread spectrum support for reduced EMI output power Speaker Docks mode Anti-Pop circuitry On-chip true cap-less headphone driver 35 mW output power (16) Charge-pump allows true ground centered outputs SNR of 102dB I2S data interface Microphone/line-in interface Analog microphone or line-in inputs Digital microphone (ACS422D67) Automatic level control On-chip low-jitter PLL for audio timing Supports an external MCLK or XTAL Optimized for frequencies of 11.2896MHz or 12.288MHz Buffered reference frequency output Low power with built in power management 1.7 V CODEC supports 1Vrms Very low standby and no-signal power consumption 1.8V digital / 1.7V analog supply for low power 2 2-wire (I C compatible) control interface 68-pin dual row 6x6 mm TLA package TM DDX and the DDX logo are trademarks of Apogee Technology. 1 V1.5 08/13 2011 INTEGRATED DEVICE TECHNOLOGY, INC. ACS422X67ACS422x67 LOW-POWER, HIGH-FIDELITY, INTEGRATED CODEC TABLE OF CONTENTS 1. OVERVIEW ................................................................................................................................ 8 1.1. Block Diagrams ..................................................................................................................................8 1.2. Audio Outputs ....................................................................................................................................8 1.3. Audio Inputs .......................................................................................................................................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 TM Class D Audio Processing ....................................................................................34 3.14.3. DDX 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 4.5. ADC Digital Filter .............................................................................................................................51 2 V1.5 08/13 2011 INTEGRATED DEVICE TECHNOLOGY, INC. ACS422X67