WM8960_06 Datasheet, PDF (36/88 Pages) Wolfson Microelectronics plc – Stereo CODEC with 1W Stereo Class D Speaker Drivers and Headphone Drivers for Portable Audio Applications

WM8960
Preliminary Technical Data
REGISTER
ADDRESS
R38 (26h)
Mono Out Mix
(1)
BIT
LABEL
7
L2MO
R39 (27h)
7
Mono Out Mix
(2)
R2MO
R42 (2Ah)
Mono Out
Volume
6
MOUTVOL
Table 23 Output Mixer Enable Control
DEFAULT
DESCRIPTION
0
Left Output Mixer to Mono Output Mixer
Control
0 = Left channel mix disabled
1 = Left channel mix enabled
0
Right Output Mixer to Mono Output
Mixer Control
0 = Right channel mix disabled
1 = Right channel mix enabled
1
Mono Output Mixer Volume Control
0 = 0dB
1 = -6dB
When left and right inputs to the mono mixer are both disabled, the mono mixer will output VMID.
ANALOGUE OUTPUTS
HP_L AND HP_R OUTPUTS
The HP_L and HP_R pins can drive a 16Ω or 32Ω headphone or a line output (see Headphone
Output and Line Output sections, respectively). The signal volume on HP_L and HP_R can be
independently adjusted under software control by writing to LOUT1VOL and ROUT1VOL,
respectively. Note that gains over 0dB may cause clipping if the signal is large. Any gain setting
below 0101111 (minimum) mutes the output driver. The corresponding output pin remains at the
same DC level (the reference voltage on the VREF pin), so that no click noise is produced when
muting or un-muting.
A zero cross detect on the analogue output may also be enabled when changing the gain setting to
minimize audible clicks and zipper noise as the gain updates. If zero cross is enabled a timeout is
also available to update the gain if a zero cross does not occur. This function may be enabled by
setting TOEN in register R23 (17h). The timeout period is set by TOCLKSEL. Note: SYSCLK must
be enabled to use this function.
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PTD, September 2006, Rev 2.0
36