WM9713L_06 Datasheet, PDF (49/108 Pages) Wolfson Microelectronics plc – AC 97 Audio + Touchpanel CODEC

Pre-Production
MONO OUTPUT
REGISTER
ADDRESS
04h
Headphone
Volume
BIT
LABEL
15 MUL
14 ZCL
13:8 HPLVOL
7
MUR
6
ZCR
5:0 HPRVOL
Table 33 HPL / HPR PGA Control
DEFAULT
WM9713L
DESCRIPTION
1 (Mute)
0
000000
(0dB)
1 (Mute)
0
000000
(0dB)
Mute HPL
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
HPL Volume
000000: 0dB (maximum)
000001: -1.5dB
… (1.5dB steps)
011111: -46.5dB
1xxxxx: -46.5dB
Mute HPR
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
HPR Volume
Similar to HPLVOL
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)
REGISTER
ADDRESS
1Ch
Output PGA
Mux Select
BIT
15:14
LABEL
MONO
Table 34 MONO PGA Input Source
DEFAULT
DESCRIPTION
00 (Vmid)
MONO input source select
00: Vmid
01: no input (tri-stated if MONO=1 in
register 3Eh)
10: MONOMIX
11: INV1
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.
w
PP Rev 3.0 June 2006
49