wm9714l Wolfson Microelectronics plc, wm9714l Datasheet - Page 57

• Manufacturer Part Number: wm9714l
• Description: Ac?97 Audio Codec
• Manufacturer: Wolfson Microelectronics plc

Pre-Production
AUXILIARY OUTPUTS – OUT3 AND OUT4
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Table 37 SPKL / SPKR PGA Control
Note:
1.
The OUT3 and OUT4 outputs (pins 37 and 33) are designed to drive a loudspeaker load down to 8Ω
and can also be used as line outputs and headphone outputs. They are designed to drive an 8Ω load
AC coupled or in a BTL (capless) configuration and can be used as a midrail buffer to drive the
headphone outputs in a capless DC configuration. The available input sources are INV1/2 and Vmid
(see Table 38).
Table 38 OUT3 / OUT4 PGA Input Source
The signal volume on OUT3 and OUT4 can be independently adjusted under software control by
writing to register 06h.
02h
Speaker
Volume
1Ch
Output PGA
Mux Select
REGISTER
REGISTER
ADDRESS
ADDRESS
For BTL speaker drive, it is recommended that both PGAs have the same gain setting.
15
14
13:8
7
6
5:0
3:2
1:0
BIT
BIT
MUL
ZCL
SPKLVOL
MUR
ZCR
SPKRVOL
OUT3
OUT4
LABEL
LABEL
1 (Mute)
0
000000
(0dB)
1 (Mute)
0
000000
(0dB)
00 (Vmid)
00 (Vmid)
DEFAULT
DEFAULT
SPKL Mute Control
1 = Mute
0 = No mute
SPKL Zero Cross Control
1 = Zero cross enabled (change volume
only on zero crossings, or after time-out)
0 = Zero cross disabled (change volume
immediately)
SPKL Volume Control
000000 = 0dB (maximum)
… (1.5dB steps)
011111 = -46.5dB
1xxxxx = -46.5dB
SPKR Mute Control
1 = Mute
0 = No mute
SPKR Zero Cross Control
1 = Zero cross enabled (change volume
only on zero crossings, or after time-out)
0 = Zero cross disabled (change volume
immediately)
SPKR Volume Control
000000 = 0dB (maximum)
… (1.5dB steps)
011111 = -46.5dB
1xxxxx = -46.5dB
OUT3 Source Control
00 = VMID
01 = No input (tri-stated if OUT3 is
disabled in 3Eh)
10 = INV1
11 = Reserved
OUT4 Source Control
00 = VMID
01 = No input (tri-stated if OUT4 is
disabled in 3Eh)
10 = INV2
11 = Reserved
DESCRIPTION
DESCRIPTION
PP, Rev 3.2, October 2008
WM9714L
57