WM8985
Pre-Production
PIN DESCRIPTION
PIN
1
NAME
LIP
TYPE
Analogue input
Analogue input
Analogue input
Analogue input
Analogue input
Analogue input
Digital Input / Output
Digital Input / Output
Digital Output
Digital Input
DESCRIPTION
Left MIC pre-amp positive input
Left MIC pre-amp negative input
2
LIN
3
L2/GPIO2
RIP
Left channel line input/secondary mic pre-amp positive input/GPIO2 pin
Right MIC pre-amp positive input
4
5
RIN
Right MIC pre-amp negative input
Right channel line input/secondary mic pre-amp positive input/GPIO3 pin
DAC and ADC sample rate clock
6
R2/GPIO3
LRC
7
8
BCLK
Digital audio bit clock
9
ADCDAT
DACDAT
MCLK
DGND
DCVDD
DBVDD
CSB/GPIO1
SCLK
ADC digital audio data output
10
11
12
13
14
15
16
17
18
19
20
21
DAC digital audio data input
Digital Input
Master clock input
Supply
Digital ground
Supply
Digital core logic supply
Supply
Digital buffer (I/O) supply
Digital Input / Output
Digital Input
3-Wire control interface chip Select / GPIO1 pin
3-Wire control interface clock input / 2-wire control interface clock input
3-Wire control interface data input / 2-Wire control interface data input
Control interface selection
SDIN
Digital Input / Output
Digital Input
MODE
AUXL
Analogue input
Analogue input
Analogue Output
Left auxiliary input
AUXR
OUT4
Right auxiliary input
Buffered midrail headphone pseudo-ground / right line output / mono mix
output
22
23
24
25
26
27
28
OUT3
ROUT2
AGND2
LOUT2
AVDD2
VMID
Analogue Output
Analogue Output
Supply
Buffered midrail headphone pseudo-ground or left line output
Class D or class AB headphone output right
Analogue ground (ground reference for ROUT2/LOUT2 and OUT3/OUT4)
Class D or class AB headphone output left
Analogue Output
Supply
Analogue supply (feeds output amplifiers ROUT2/LOUT2 and OUT3/OUT4)
Decoupling for ADC and DAC reference voltage
Reference
AGND1
Supply
Analogue ground (ground reference for all input amplifiers, PLL, ADC and
DAC, internal bias circuits, output amplifiers LOUT1, ROUT1)
29
30
31
ROUT1
LOUT1
AVDD1
Analogue Output
Analogue Output
Supply
Class AB headphone or line output right
Class AB headphone or line output left
Analogue supply (feeds all input amplifiers, PLL, ADC and DAC, internal bias
circuits, output amplifiers LOUT1, LOUT2))
32
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”
PP, Rev 3.4, October 2006
w
6
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
