WM8978CGEFLSLASHV datasheet(5/118 Pages) WOLFSON

5 / 118 page

Production Data

WM8978

PD, Rev 4.5, October 2011

PIN DESCRIPTION

NAME

TYPE

DESCRIPTION

LIP

Analogue input

Left Mic Pre-amp positive input

LIN

Analogue input

Left Mic Pre-amp negative input

L2/GPIO2

Analogue input

Left channel line input/secondary mic pre-amp positive input/GPIO2 pin

RIP

Analogue input

Right Mic Pre-amp positive input

RIN

Analogue input

Right Mic Pre-amp negative input

R2/GPIO3

Analogue input

Right channel line input/secondary mic pre-amp positive input/GPIO3 pin

LRC

Digital Input / Output

DAC and ADC Sample Rate Clock

BCLK

Digital Input / Output

Digital Audio Port Clock

ADCDAT

Digital Output

ADC Digital Audio Data Output

DACDAT

Digital Input

DAC Digital Audio Data Input

MCLK

Digital Input

Master Clock Input

DGND

Supply

Digital ground

DCVDD

Supply

Digital core logic supply

DBVDD

Supply

Digital buffer (I/O) supply

CSB/GPIO1

Digital Input / Output

3-Wire Control Interface Chip Select / GPIO1 pin

SCLK

Digital Input

3-Wire Control Interface Clock Input / 2-Wire Control Interface Clock

Input

SDIN

Digital Input / Output

3-Wire Control Interface Data Input / 2-Wire Control Interface Data Input

MODE

Digital Input

Control Interface Selection

AUXL

Analogue input

Left Auxillary input

AUXR

Analogue input

Right Auxillary input

OUT4

Analogue Output

Buffered midrail Headphone pseudo-ground, or Right line output or MONO

mix output

OUT3

Analogue Output

Buffered midrail Headphone pseudo-ground, or Left line output

ROUT2

Analogue Output

Second right output, or BTL speaker driver positive output

SPKGND

Supply

Speaker ground (feeds speaker amp and OUT3/OUT4)

LOUT2

Analogue Output

Second left output, or BTL speaker driver negative output

SPKVDD

Supply

Speaker supply (feed speaker amp only)

VMID

Reference

Decoupling for ADC and DAC reference voltage

AGND

Supply

Analogue ground (feeds ADC and DAC)

ROUT1

Analogue Output

Headphone or Line Output Right

LOUT1

Analogue Output

Headphone or Line Output Left

AVDD

Supply

Analogue supply (feeds ADC and DAC)

MICBIAS

Analogue Output

Microphone Bias

Note:

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

the application note WAN_0118 on “Guidelines on How to Use QFN Packages and Create Associated PCB Footprints”.

WM8978CGEFL/V Datasheet(PDF) 5 Page - Wolfson Microelectronics plc

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