WM8974 datasheet(4/89 Pages) CIRRUS

4 / 89 page

WM8974

Rev 4.7

PIN DESCRIPTION

PIN NO

NAME

TYPE

DESCRIPTION

MICBIAS

Analogue Output

Microphone bias

AVDD

Supply

Analogue supply (feeds ADC and DAC)

AGND

Supply

Analogue ground (feeds ADC and DAC)

DCVDD

Supply

Digital core supply

DBVDD

Supply

Digital buffer (input/output) supply

DGND

Supply

Digital ground

ADCDAT

Digital Output

ADC digital audio data output

DACDAT

Digital Input

DAC digital audio data input

FRAME

Digital Input / Output

DAC and ADC sample rate clock or frame synch

BCLK

Digital Input / Output

Digital audio port clock

MCLK

Digital Input

Master clock input

CSB/GPIO

Digital Input / Output

3-Wire MPU chip select or general purpose input/output pin.

SCLK

Digital Input

3-Wire MPU clock Input / 2-Wire MPU Clock Input

SDIN

Digital Input / Output

3-Wire MPU data Input / 2-Wire MPU Data Input

MODE

Digital Input

Control interface mode selection pin.

MONOOUT

Analogue Output

Mono output

SPKOUTP

Analogue Output

Speaker output positive

SPKGND

Supply

Speaker ground (feeds speaker and mono output amps only)

SPKOUTN

Analogue Output

Speaker output Negative

SPKVDD

Supply

Speaker supply (feeds speaker and mono output amps only)

AUX

Analogue Input

Auxiliary analogue input

VMID

Reference

Decoupling for midrail reference voltage

MICN

Analogue Input

Microphone negative input

MICP

Analogue Input

Microphone positive input (common mode)

Note:

It is recommended that the QFN ground paddle should be connected to analogue ground on the application PCB.

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