Product Preview
WM8955L
PIN DESCRIPTION
PIN #
NAME
MCLK
TYPE
DESCRIPTION
1
2
3
4
5
6
7
8
9
Digital Input
Master Clock
DCVDD
DBVDD
DGND
SupplyDigital Core Supply
SupplyDigital Buffer (I/O) Supply
SupplyDigital Ground (return path for both DCVDD and DBVDD)
BCLK
Digital Input / Output
Audio Interface Bit Clock
DACDAT
DACLRC
CLKOUT
PLLGND
Digital Input
Digital Input / Output
Digital Output
DAC Digital Audio Data
Audio Interface Left / Right Clock
Buffered Clock Output (from MCLK or internal PLL)
SuppclyoInnntercnteadllyto AGND. Connect this pin to AGND externally
for best PLL performance, or leave floating.
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
MONOOUT
OUT3
Analogue Output
Mono Output
Analogue Output
Analogue Output
Analogue Output
Output 3 (can be used as Headphone Pseudo Ground)
Right Output 1 (Line or Headphone)
Left Output 1 (Line or Headphone)
ROUT1
LOUT1
HPGND
ROUT2
LOUT2
HPVDD
AVDD
SufpoprlAySnuaplopglyue Output Drivers (LOUT1/2, ROUT1/2)
Analogue Output
Analogue Output
Right Output 1 (Line or Headphone or Speaker)
Left Output 1 (Line or Headphone or Speaker)
SufpoprlAySnuaplopglyue Output Drivers (LOUT1/2, ROUT1/2, MONOUT)
SupplyAnalogue Supply
AGND
SupplyAnalogue Ground (return path for AVDD)
VREF
Analogue Output
Reference Voltage Decoupling Capacitor
Midrail Voltage Decoupling Capacitor
No Internal Connection
VMID
Analogue Output
No Connect
NC
HPDETECT
NC
Logic Input
Headphone / Speaker switch (referred to AVDD)
No Internal Connection
No Connect
MONOIN-
MONOIN+
LINEINR
LINEINL
MODE
CSB
Analogue Input
Analogue Input
Analogue Input
Analogue Input
Digital Input
Negative end of MONOIN+, for differential mono signals
Analogue Line-in to mixers (mono channel)
Analogue Line-in to mixers (right channel)
Analogue Line-in to mixers (left channel)
Control Interface Selection
Digital Input
Chip Select / Device Address Selection
Control Interface Data Input / 2-wire Acknowledge output
Control Interface Clock Input
SDIN
Digital Input/Output
Digital Input
SCLK
Product Preview Rev 0.4 May2003
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
