WM8351 datasheet(5/330 Pages) WOLFSON

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Production Data

WM8351

PD, April 2012, Rev 4.5

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

13 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)................................................................................68

13.4.7

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

13.5

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

13.5.1

ADC VOLUME CONTROL ...................................................................................................73

13.5.2

ADC HIGH-PASS FILTER....................................................................................................73

13.6

DIGITAL MIXING .............................................................................................. 74

13.6.1

DIGITAL SIDETONE ............................................................................................................74

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..........................................................................................................................97

13.11 COMPANDING ................................................................................................. 97

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

13.12.1

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

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