WM9714L_06 WOLFSON [Wolfson Microelectronics plc], WM9714L_06 Datasheet - Page 48

• Manufacturer Part Number: WM9714L_06
• Description: AC 97 Audio CODEC
• Manufacturer: WOLFSON [Wolfson Microelectronics plc]

WM9714L
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 8
and can also be used as line outputs and headphone outputs. They are designed to drive an 8
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.
When not in use OUT3 and OUT4 can be powered down using the Powerdown register bits OUT3
and OUT4 (register 3Eh, bits [11:12]). To minimise pops and clicks when the PGA is powered down /
up it is recommended that the Vmid input is selected during the power down / up cycle. This ensures
the same DC level is maintained on the output pin throughout.
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
Mute SPKL
1: Mute (OFF)
0: No Mute (ON)
Left zero cross enable
0: Change gain immediately
1: Change gain only on zero crossings,
or after time-out
SPKL Volume
000000: 0dB (maximum)
000001: -1.5dB
… (1.5dB steps)
011111: -46.5dB
1xxxxx: -46.5dB
Mute SPKR
1: Mute (OFF)
0: No Mute (ON)
Right zero cross enable
0: Change gain immediately
1: Change gain only on zero crossings,
or after time-out
SPKR Volume
Similar to SPKLVOL
OUT3 input source select
00: Vmid
01: no i/p (Z
10: INV1
11: unused
OUT4 input source select
00: Vmid
01: no i/p (Z
10: INV2
11: unused
H
H
DESCRIPTION
DESCRIPTION
if buffer disabled)
if buffer disabled)
PP Rev 3.0 June 2006
Pre-Production
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