WM8985 Datasheet, PDF (6/118 Pages) Wolfson Microelectronics plc – Multimedia CODEC With Class D Headphone and Line Out

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