WM8753 Wolfson Microelectronics plc, WM8753 Datasheet - Page 42

• Manufacturer Part Number: WM8753
• Description: HI FI AND TELEPHONY DUAL CODEC
• Manufacturer: Wolfson Microelectronics plc

Advanced Information
ANALOGUE OUTPUTS
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Table 34 Mono Output Mixer Control
LOUT1/ROUT1 OUTPUTS
The LOUT1 and ROUT1 pins can drive a 16
Output and Line Output sections, respectively). The signal volume on LOUT1 and ROUT1 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 (-73dB) 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 R18 (12h).
R38 (26h)
Mono Mixer
Control (1)
R39 (27h)
Mono Mixer
Control (2)
REGISTER
ADDRESS
8
7
[6:4]
8
7
[6:4]
3
[2:0]
BIT
LD2MO
MM2MO
MM2MOVOL
[2:0]
RD2MO
ST2MO
ST2MOVOL
[2:0]
VXD2MO
VXD2MOVOL
[2:0]
LABEL
0
0
101
(-9dB)
0
0
101
(-9dB)
0
101
(-6dB)
or 32
DEFAULT
headphone or a line output (see Headphone
Left DAC to Mono Mixer
0 = Disable (Mute)
1 = Enable Path
MM Signal to Mono Mixer
0 = Disable (Mute)
1 = Enable Path
MM Signal to Mono Mixer Volume
000 = +6dB
… (3dB steps)
111 = -15dB
Right DAC to Mono Mixer
0 = Disable (Mute)
1 = Enable Path
0 = Disable (Mute)
1 = Enable Path
Sidetone Signal to Mono Mixer
Volume
000 = +6dB
… (3dB steps)
111 = -15dB
0 = Disable (Mute)
1 = Enable Path
Voice Signal to Mono Mixer Volume
000 = +9dB
… (3dB steps)
111 = -12dB
Sidetone Signal to Mono Mixer
Voice DAC to Mono Mixer
DESCRIPTION
AI Rev 3.1 June 2004
WM8753L
42