WM8960 View Datasheet(PDF) - Cirrus Logic
Part Name
Description
MFG CO.
'WM8960' PDF : 91 Pages View PDF
Production Data
WM8960
ENABLING THE OUTPUTS
Each analogue output of the WM8960 can be independently enabled or disabled. The analogue mixer
associated with each output is powered on or off along with the output pin. All outputs are disabled by
default. To save power, unused outputs should remain disabled.
REGISTER
ADDRESS
R26 (1Ah)
Power
Management
(2)
BIT
LABEL
6
LOUT1
5
ROUT1
4
SPKL
3
SPKR
DEFAULT
0
0
0
0
R49 (31h)
Class D
Control (1)
1
OUT3
0
7:6 SPK_OP_EN 00
[1:0]
Note: All “Enable” bits are 1 = ON, 0 = OFF
Table 26 Analogue Output Control
DESCRIPTION
LOUT1 Output Enable
ROUT1 Output Enable
SPK_LP and SPK_LN Volume Control
Enable
SPK_RP and SPK_RN Volume Control
Enable
OUT3 Enable
Enable Class D Speaker Outputs
00 = Off
01 = Left speaker only
10 = Right speaker only
11 = Left and right speakers enabled
The speaker output enable bits SPK_OP_EN[1:0] should not be enabled until there is a valid
switching clock to drive the class D outputs. This means that SYSCLK must be active, and DCLKDIV
set to an appropriate value to produce a class D clock of between 700kHz and 800kHz for best
performance (See "Class D Speaker Outputs" and "Clocking and Sample Rates" sections for more
information).
Whenever an analogue output is disabled, it remains connected to VREF through a resistor. This
helps to prevent pop noise when the output is re-enabled. The resistance between VREF and each
output can be controlled using the VROI bit in register 27. If a high impedance is desired for disabled
outputs, VROI can then be set to 1, increasing the resistance to about 20k.
REGISTER
ADDRESS
R27 (1Bh)
Additional (1)
BIT
LABEL
6
VROI
DEFAULT
0
Table 27 Disabled Outputs to VREF Resistance
DESCRIPTION
VREF to Analogue Output Resistance
(Disabled Outputs)
0 = 500 VMID to output
1 = 20k VMID to output
HEADPHONE OUTPUT
Analogue outputs HP_L/HP_R, and OUT3, can drive a 16 or 32 headphone load, either through
DC blocking capacitors, or DC coupled without any capacitor.
Headphone Output using DC blocking capacitors
DC Coupled Headphone Output
(L2MO=0; R2MO=0)
Figure 15 Recommended Headphone Output Configurations
w
PD, August 2013, Rev 4.2
41
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