wm9714l Wolfson Microelectronics plc, wm9714l Datasheet - Page 51

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

Pre-Production
PCBEEP INPUT
DIFFERENTIAL MONO INPUT
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Pin 19 (PCBEEP) is a mono, line level input intended for externally generated signal or warning
tones. It is routed directly to the record selector and all three output mixers, without an input
amplifier. The signal gain into each mixer can be independently controlled, with a separate mute bit
for each signal path.
PCBEEP is biased internally to the reference voltage VREF. When the signal is not selected as an
input to any of the mixers the input remains biased to VREF using special anti-thump circuitry to
suppress any audible clicks when changing inputs.
Table 30 PCBEEP Control
PCBEEP and MONOIN inputs can be configured to provide a differential mono input. This is
achieved by mixing the two inputs together using the headphone mixers or the speaker mixer. Note
that the gain of the MONOIN PGA must match the gain of the PCBEEP mixer input to achieve a
balanced differential mono input.
16h
PCBEEP input
REGISTER
ADDRESS
15
14:12
11
10:8
7
6:4
BIT
B2H
B2HVOL
B2S
B2SVOL
B2M
B2MVOL
LABEL
1
010
(0dB)
1
010
(0dB)
1
010
(0dB)
DEFAULT
PCBEEP to Headphone Mixer Mute
Control
1 = Mute
0 = No mute
PCBEEP to Headphone Mixer Volume
Control
000 = +6dB
… (+3dB steps)
111 = -15dB
PCBEEP to Speaker Mixer Mute Control
1 = Mute
0 = No mute
PCBEEP to Speaker Mixer Volume
Control
000 = +6dB
… (+3dB steps)
111 = -15dB
PCBEEP to Mono Mixer Mute Control
1 = Mute
0 = No mute
PCBEEP to Mono Mixer Volume Control
000 = +6dB
… (+3dB steps)
111 = -15dB
DESCRIPTION
PP, Rev 3.2, October 2008
WM9714L
51