wm9714l Wolfson Microelectronics plc, wm9714l Datasheet - Page 55

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

Pre-Production
MONO OUTPUT
w
Table 33 HPL / HPR PGA Control
The MONO output (pin 31) is designed to drive a 16Ω headphone load and can also be used as a
line output. The available input sources are MONOMIX, INV1 and Vmid (see Table 34)
Table 34 MONO PGA Input Source
The signal volume on MONO can be independently adjusted under software control by writing to
register 08h.
When not in use MONO can be powered down using the Powerdown register bit MONO (register
3Eh, bit 13). 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.
04h
Headphone
Volume
1Ch
Output PGA
Mux Select
REGISTER
REGISTER
ADDRESS
ADDRESS
15
14
13:8
7
6
5:0
15:14
BIT
BIT
MUL
ZCL
HPLVOL
MUR
ZCR
HPRVOL
MONO
LABEL
LABEL
1 (Mute)
0
000000
(0dB)
1 (Mute)
0
000000
(0dB)
00 (Vmid)
DEFAULT
DEFAULT
HPL Mute Control
1 = Mute
0 = No mute
HPL Zero Cross Control
1 = Zero cross enabled (change volume
only on zero crossings, or after time-out)
0 = Zero cross disabled (change volume
immediately)
HPL Volume Control
000000 = 0dB (maximum)
… (1.5dB steps)
011111 = -46.5dB
1xxxxx = -46.5dB
HPR Mute Control
1 = Mute
0 = No mute
HPR Zero Cross Control
1 = Zero cross enabled (change volume
only on zero crossings, or after time-out)
0 = Zero cross disabled (change volume
immediately)
HPR Volume Control
000000 = 0dB (maximum)
… (1.5dB steps)
011111 = -46.5dB
1xxxxx = -46.5dB
MONO Source Control
00 = VMID
01 = No input (tri-stated if MONO is
disabled in 3Eh)
10 = MONOMIX
11 = INV1
DESCRIPTION
DESCRIPTION
PP, Rev 3.2, October 2008
WM9714L
55