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WM9711 Datasheet(PDF) 34 Page - Wolfson Microelectronics plc

Part # WM9711
Description  LOW POWER AUDIO CODEC FOR PORTABLE APPLICATIONS
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM9711 Datasheet(HTML) 34 Page - Wolfson Microelectronics plc

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WM9711L
Production Data
w
PD Rev 4.1 April 2004
34
AUDIO MIXERS
MIXER OVERVIEW
The WM9711L 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.
PHONE_IN
PCBEEP
LINE_IN
Stereo
headphone /
headset
HPOUTL
HPOUTR
HPVOL
(Reg 04h)
MONOOUT
(PHONE TX)
OUT3VOL
(Reg 16h)
LOUT2
ROUT2
OUT2VOL
(Reg 02h)
loud
speaker
OUT3
ear
speaker
0Ch [4:0]
10h [12:8,4:0]
18h [12:8,4:0]
RECORD
SELECT
0Eh [12:8,4:0]
MICR
MICL
DIFF /
STEREO/
MONO
(Reg 20h)
STEREO
DAC
AUX
DAC
(12-BIT)
1Ch / ALC
0/20
dB
0Eh [7]
M
U
X
MONOOUT
VREF
18h [15]
10h [15]
14h [15:12]
14h [11:7]
0Ch [15]
12h [15:12]
18h [13]
10h [13]
0Eh [14,13]
1Ah [13:11]
0Ah [15:12]
HEAD
PHONE/
EAR
SPEAKER
MIX
PHONE
MIX
12h [7:4]
0Ah [7:4]
-1
M
U
X
12h [11:8]
18h [14]
10h [14]
0Ah [11:8]
0Ch [14]
BACK
SPEAKER
MIX
SRC
(Reg 16h)
OUT3SRC
(Reg 16h)
STEREO
ADC
M
U
X
PHONE MIX
HEADPHONE MIX
BACK SPKR MIX
INV
(Reg 02h)
1Ah [14]
0/20
dB
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:
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”)
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).


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