WM8940 datasheet(4/88 Pages) CIRRUS

4 / 88 page

WM8940

Rev 4.4

MINIMUM AND MAXIMUM GAIN ..................................................................................................................................................35

ALC HOLD TIME (NORMAL MODE ONLY) ..................................................................................................................................36

PEAK LIMITER ..............................................................................................................................................................................38

NOISE GATE (NORMAL MODE ONLY) .......................................................................................................................................39

OUTPUT SIGNAL PATH ..........................................................................................................41

DIGITAL HI-FI DAC VOLUME CONTROL ....................................................................................................................................41

HI-FI DIGITAL TO ANALOGUE CONVERTER (DAC) ..................................................................................................................42

AUTOMUTE...................................................................................................................................................................................42

DAC OUTPUT LIMITER ................................................................................................................................................................42

VOLUME BOOST ..........................................................................................................................................................................43

ANALOGUE OUTPUTS ...........................................................................................................45

SPKOUTP/SPKOUTN OUTPUTS .................................................................................................................................................45

ZERO CROSS TIMEOUT ..............................................................................................................................................................46

MONO MIXER AND OUTPUT .......................................................................................................................................................47

ENABLING THE OUTPUTS ..........................................................................................................................................................47

UNUSED ANALOGUE INPUTS/OUTPUTS ..................................................................................................................................48

OUTPUT SWITCH ...................................................................................................................49

THERMAL SHUTDOWN ...............................................................................................................................................................49

SPEAKER OUTPUT ......................................................................................................................................................................49

HEADPHONE OUTPUT ................................................................................................................................................................50

MONO OUTPUT ............................................................................................................................................................................50

DIGITAL AUDIO INTERFACES ...............................................................................................51

MASTER AND SLAVE MODE OPERATION.................................................................................................................................51

AUDIO DATA FORMATS ..............................................................................................................................................................51

AUDIO INTERFACE CONTROL ...................................................................................................................................................53

LOOPBACK ...................................................................................................................................................................................55

AUDIO SAMPLE RATES .........................................................................................................55

MASTER CLOCK AND PHASE LOCKED LOOP (PLL)...........................................................55

INTEGER N DIVISION...................................................................................................................................................................57

FRACTIONAL K MODE .................................................................................................................................................................57

EXAMPLE PLL CONFIGURATION: ..............................................................................................................................................57

COMPANDING.........................................................................................................................58

GENERAL PURPOSE INPUT/OUTPUT ..................................................................................60

CONTROL INTERFACE ..........................................................................................................61

SELECTION OF CONTROL MODE AND 2-WIRE MODE ADDRESS..........................................................................................61

USE OF MODE AS A GPIO PIN IN 3-WIRE MODE .....................................................................................................................61

3-WIRE SERIAL CONTROL MODE ..............................................................................................................................................62

READBACK IN 3-WIRE MODE .....................................................................................................................................................62

2-WIRE SERIAL CONTROL MODE ..............................................................................................................................................63

RESETTING THE CHIP ...........................................................................................................63

POWER SUPPLIES .................................................................................................................64

RECOMMENDED POWER UP/DOWN SEQUENCE....................................................................................................................64

POWER MANAGEMENT .........................................................................................................66

VMID ..............................................................................................................................................................................................66

BIASEN..........................................................................................................................................................................................66

ESTIMATED SUPPLY CURRENTS ..............................................................................................................................................66

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