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WM8731SEDS/R Datasheet(PDF) 21 Page - Wolfson Microelectronics plc

Part # WM8731SEDS/R
Description  Portable Internet Audio CODEC with Headphone Driver and Programmable Sample Rates
PDF  63 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8731SEDS/R Datasheet(HTML) 21 Page - Wolfson Microelectronics plc

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WM8731 / WM8731L
Production Data
w
PD Rev 4.3 August 2006
21
Figure 9 Functional Block Diagram
AUDIO SIGNAL PATH
LINE INPUTS
The WM8731/L provides Left and Right channel line inputs (RLINEIN and LLINEIN). The inputs are
high impedance and low capacitance, thus ideally suited to receiving line level signals from external
hi-fi or audio equipment.
Both line inputs include independent programmable volume level adjustments and ADC input mute.
The scheme is illustrated in Figure 10. Passive RF and active Anti-Alias filters are also incorporated
within the line inputs. These prevent high frequencies aliasing into the audio band or otherwise
degrading performance.
12.5k
VMID
LINEIN
To
ADC
Figure 10 Line Input Schematic
MUX
MUX
VOL
VOL
ADC
ADC
DIGITAL
FILTERS
DIGTAL AUDIO INTERFACE
CONTROL INTERFACE
DAC
DAC
VOL/
MUTE
VOL/
MUTE
H/P
DRIVER
H/P
DRIVER
Σ
Σ
RHPOUT
LHPOUT
ROUT
LOUT
RLINEIN
LLINEIN
VMID
AVDD
AGND
0dB/
20dB
MICIN
+12 to -34.5dB, 1.5dB Steps,
Reg 02h
+6 to -73dB
1 dB Steps, Reg 06h
HPVDD
HPGND
+6 to -73dB
1 dB Steps, Reg 04h
OSC
MICBIAS
MUTE
Bypass, Reg 08h
Bypass, Reg 08h
CLKIN
DIVIDER
(Div x1, x2)
CLKOUT
DIVIDER
(Div x1, x2)
ATTEN/
MUTE
MUTE
MUTE
ATTEN/
MUTE
MUTE
MUTE
MUTE
MUTE
MUTE
WM8731
+12 to -34.5dB, 1.5dB Steps,
Reg 00h
MIC BOOST Reg 08h
SIDEATT,
Reg 08h
SIDEATT,
Reg 08h
SIDETONE
Reg 08h
SIDETONE
Reg 08h
DACMUTE
Reg 0Ah
DACMUTE
Reg 0Ah
CLKODIV2, Reg 10h
OSCPD
Reg 0Ch
CLKOUTPD, Reg 0Ch
CLKIDIV2, Reg 10h
RLINEIN Mute
Reg 02h
LLINEIN Mute
Reg 00h
INSEL, Reg 08h
INSEL, Reg 08h



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