WM8983
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DESCRIPTION
REGISTER
ADDRESS
BIT
LABEL
LOUT1ZC
DEFAULT
R52
7
0
Headphone volume zero cross
enable:
LOUT1
1 = Change gain on zero cross only
0 = Change gain immediately
Left headphone output mute:
0 = Normal operation
1 = Mute
Volume
control
6
LOUT1MUTE
LOUT1VOL
0
5:0
111001
Left headphone output volume:
000000 = -57dB
000001 = -56dB
...
111001 = 0dB
...
111111 = +6dB
8
7
HPVU
Not latched LOUT1 and ROUT1 volumes do not
update until a 1 is written to
OUT1VU (in reg 52 or 53)
R53
ROUT1ZC
0
Headphone volume zero cross
enable:
ROUT1
Volume
control
1 = Change gain on zero cross only
0 = Change gain immediately
Right headphone output mute:
0 = Normal operation
1 = Mute
6
ROUT1MUTE
ROUT1VOL
0
5:0
111001
Right headphone output volume:
000000 = -57dB
000001 = -56dB
…
111001 = 0dB
...
111111 = +6dB
8
HPVU
Not latched LOUT1 and ROUT1 volumes do not
update until a 1 is written to
OUT1VU (in reg 52 or 53)
Table 32 OUT1 Volume Control
SPEAKER OUTPUTS (LOUT2 AND ROUT2)
The outputs LOUT2 and ROUT2 are designed to drive an 8Ω BTL speaker but can optionally drive
two headphone loads of 16Ω/32Ω or a line output (see Headphone Output and Line Output sections,
respectively). Each output has an individual volume control PGA, an output boost/level shift bit, a
mute and an enable as shown in Figure 25. LOUT2 and ROUT2 output the left and right channel
mixer outputs respectively.
The ROUT2 signal path also has an optional invert. The amplifier used for this invert can be used to
mix in the AUXR signal with an adjustable gain range of -15dB -> +6dB. This allows a ‘beep’ signal
to be applied only to the speaker output without affecting the HP or line outputs.
PP Rev 1.1 August 2005
50
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
