WM8960 datasheet(41/92 Pages) WOLFSON

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Production Data

WM8960

PD, August 2013, Rev 4.2

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.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R26 (1Ah)

Power

Management

(2)

LOUT1

LOUT1 Output Enable

ROUT1

ROUT1 Output Enable

SPKL

SPK_LP and SPK_LN Volume Control

Enable

SPKR

SPK_RP and SPK_RN Volume Control

Enable

OUT3

OUT3 Enable

R49 (31h)

Class D

Control (1)

7:6

SPK_OP_EN

[1:0]

Enable Class D Speaker Outputs

00 = Off

01 = Left speaker only

10 = Right speaker only

11 = Left and right speakers enabled

Note: All “Enable” bits are 1 = ON, 0 = OFF

Table 26 Analogue Output Control

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

.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R27 (1Bh)

Additional (1)

VROI

VREF to Analogue Output Resistance

(Disabled Outputs)

0 = 500

 VMID to output

1 = 20k

 VMID to output

Table 27 Disabled Outputs to VREF Resistance

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

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