wm9712l Wolfson Microelectronics plc, wm9712l Datasheet - Page 35

• Manufacturer Part Number: wm9712l
• Description: Ac?97 Audio And Touchpanel Codec
• Manufacturer: Wolfson Microelectronics plc

Production Data
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AUDIO MIXERS
PHONE_IN
PCBEEP
LINE_IN
MICR
MICL
BACK SPKR MIX
HEADPHONE MIX
PHONE MIX
STEREO/
(Reg 20h)
MONO
DIFF /
M
U
X
RECORD
SELECT
MIXER OVERVIEW
The WM9712L has three separate low-power audio mixers to cover all audio functions required by
smartphones, PDAs and handheld computers. The diagram below shows the routing of the analogue
audio signals into the mixers. The numbers at the mixer inputs refer to the control register bits that
control the volume and muting for that particular signal.
Figure 4 Audio Mixer Overview
HEADPHONE MIXER
The headphone mixer drives the HPOUTL and HPOUTR outputs. It also drives OUT3, if this pin is
connected to an ear speaker (phone receiver). The following signals can be mixed into the
headphone path:
•
•
•
•
•
•
•
In a typical smartphone application, the headphone signal is a mix of PHONE and sidetone (for
phone calls) and the stereo DAC signal (for music playback).
STEREO
DAC
AUX
DAC
(12-BIT)
PHONE (controlled by register 0Ch, see “Audio Inputs”)
LINE_IN (controlled by register 10h, see “Audio Inputs”)
the output of the Record PGA (see “Audio ADC”, “Record Gain”)
the stereo DAC signal (controlled by register 18h, see “Audio DACs”)
the MIC signal (controlled by register 0Eh, see “Audio Inputs”)
PC_BEEP (controlled by register 0Ah, see “Audio Inputs”)
the AUXDAC signal (controlled by register 12h, see “Auxiliary DAC”)
1Ah [14]
0Eh [12:8,4:0]
10h [12:8,4:0]
0Ch [4:0]
18h [12:8,4:0]
1Ch / ALC
0/20
dB
STEREO
ADC
0Eh [7]
0/20
dB
0Eh [14,13]
18h [13]
1Ah [13:11]
10h [13]
12h [7:4]
0Ah [7:4]
0Ch [15]
10h [15]
14h [11:7]
18h [15]
14h [15:12]
0Ah [15:12]
12h [15:12]
10h [14]
18h [14]
12h [11:8]
0Ah [11:8]
0Ch [14]
SPEAKER
SPEAKER
PHONE/
PHONE
HEAD
BACK
EAR
MIX
MIX
MIX
(Reg 16h)
MONOOUT
SRC
M
U
X
VREF
-1
(Reg 02h)
OUT3SRC
(Reg 16h)
INV
M
U
X
OUT3VOL
(Reg 16h)
(Reg 04h)
HPVOL
OUT2VOL
(Reg 02h)
PD Rev 4.5 August 2006
MONOOUT
(PHONE TX)
OUT3
HPOUTL
HPOUTR
LOUT2
ROUT2
WM9712L
speaker
ear
speaker
loud
headphone /
headset
Stereo
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