WM8352 datasheet(5/336 Pages) WOLFSON

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Production Data

WM8352

PD, February 2011, Rev 4.4

12.1

GENERAL DESCRIPTION ............................................................................. 45

12.1.1

CLOCKING THE AUDIO CODEC ........................................................................................ 46

12.1.2

CLOCKING THE DC-DC CONVERTERS ............................................................................ 46

12.1.3

INTERNAL RC OSCILLATOR.............................................................................................. 46

12.2

CRYSTAL OSCILLATOR................................................................................ 46

12.3

CLOCKING AND SAMPLE RATES ................................................................ 47

12.3.1

SYSCLK CONTROL............................................................................................................. 49

12.3.2

ADC / DAC SAMPLE RATES............................................................................................... 50

12.3.3

BCLK CONTROL ................................................................................................................. 52

12.3.4

ADCLRCLK / DACLRCLK CONTROL ................................................................................. 54

12.3.5

OPCLK CONTROL .............................................................................................................. 55

12.3.6

SLOWCLK CONTROL ......................................................................................................... 55

12.4

FLL ................................................................................................................. 55

12.4.1

EXAMPLE FLL CALCULATION ........................................................................................... 58

12.4.2

EXAMPLE FLL SETTINGS .................................................................................................. 59

AUDIO CODEC SUBSYSTEM.....................................................................60

13.1

GENERAL DESCRIPTION ............................................................................. 60

13.2

AUDIO PATHS ............................................................................................... 61

13.3

ENABLING THE AUDIO CODEC ................................................................... 62

13.4

INPUT SIGNAL PATH .................................................................................... 64

13.4.1

MICROPHONE INPUTS ...................................................................................................... 64

13.4.2

ENABLING THE PRE-AMPLIFIERS .................................................................................... 65

13.4.3

SELECTING INPUT SIGNALS............................................................................................. 65

13.4.4

CONTROLLING THE PRE-AMPLIFIER GAINS................................................................... 66

13.4.5

MICROPHONE BIASING ..................................................................................................... 67

13.4.6

AUXILIARY INPUTS (IN3L AND IN3R)................................................................................ 67

13.4.7

INPUT MIXERS.................................................................................................................... 69

13.5

ANALOGUE TO DIGITAL CONVERTER (ADC) ............................................. 71

13.5.1

ADC VOLUME CONTROL ................................................................................................... 72

13.5.2

ADC HIGH-PASS FILTER.................................................................................................... 72

13.6

DIGITAL MIXING............................................................................................ 73

13.6.1

DIGITAL SIDETONE............................................................................................................ 73

13.7

DIGITAL TO ANALOGUE CONVERTER (DAC) ............................................. 75

13.7.1

DAC PLAYBACK VOLUME CONTROL ............................................................................... 76

13.7.2

DAC SOFT MUTE AND SOFT UN-MUTE............................................................................ 76

13.7.3

DAC DE-EMPHASIS............................................................................................................ 77

13.7.4

DAC OUTPUT PHASE AND MONO MIXING....................................................................... 78

13.7.5

DAC STOPBAND ATTENUATION....................................................................................... 78

13.8

OUTPUT SIGNAL PATH ................................................................................ 79

13.8.1

ENABLING THE ANALOGUE OUTPUTS ............................................................................ 79

13.8.2

OUTPUT MIXERS................................................................................................................ 80

13.9

ANALOGUE OUTPUTS.................................................................................. 83

13.9.1

OUT1L AND OUT1R............................................................................................................ 83

13.9.2

OUT2L AND OUT2R............................................................................................................ 85

13.9.3

HEADPHONE OUTPUTS EXTERNAL CONNECTIONS ..................................................... 87

13.9.4

OUT3 AND OUT4 ................................................................................................................ 89

13.10

DIGITAL AUDIO INTERFACE ........................................................................ 91

13.10.1

AUDIO DATA FORMATS..................................................................................................... 91

13.10.2

AUDIO INTERFACE TDM MODE ........................................................................................ 94

13.10.3

TDM DATA FORMATS......................................................................................................... 94

13.10.4

LOOPBACK ......................................................................................................................... 96

13.11

COMPANDING ............................................................................................... 97

13.12

ADDITIONAL CODEC FUNCTIONS............................................................... 99

13.12.1

HEADPHONE JACK DETECT ............................................................................................. 99

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