WM8731SEDS/V Wolfson Microelectronics, WM8731SEDS/V Datasheet - Page 21

• Manufacturer Part Number: WM8731SEDS/V
• Description: Audio CODECs Stereo Codec with H/P
• Manufacturer: Wolfson Microelectronics

Specifications of WM8731SEDS/V

• Interface Type: Serial (2-Wire or 3-Wire), I2S
• Resolution: 24 bit
• Operating Supply Voltage: 2.7 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SSOP-28
• Minimum Operating Temperature: - 40 C
• Number Of Channels: 2 ADC / 2 DAC
• Snr: 90 dB
• Thd Plus Noise: - 84 dB
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

MICBIAS
RLINEIN
LLINEIN
MICIN
AGND
AVDD
VMID
WM8731 / WM8731L
Figure 9 Functional Block Diagram
AUDIO SIGNAL PATH
w
+12 to -34.5dB, 1.5dB Steps,
+12 to -34.5dB, 1.5dB Steps,
Reg 0Ch
VOL
VOL
OSCPD
OSC
Reg 02h
Reg 00h
MIC BOOST Reg 08h
20dB
0dB/
CLKOUTPD, Reg 0Ch
CLKIDIV2, Reg 10h
(Div x1, x2)
DIVIDER
CLKIN
RLINEIN Mute
LLINEIN Mute
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.
Figure 10 Line Input Schematic
MUTE
MUTE
Reg 00h
Reg 02h
MUTE
MUTE
LINEIN
CLKODIV2, Reg 10h
INSEL, Reg 08h
INSEL, Reg 08h
MUX
MUX
(Div x1, x2)
CLKOUT
DIVIDER
ADC
ADC
12.5k
CONTROL INTERFACE
DIGTAL AUDIO INTERFACE
FILTERS
DIGITAL
VMID
DAC
DAC
Bypass, Reg 08h
DACMUTE
Bypass, Reg 08h
Reg 0Ah
DACMUTE
SIDEATT,
Reg 0Ah
ATTEN/
Reg 08h
SIDEATT,
Reg 08h
ATTEN/
MUTE
MUTE
MUTE
MUTE
MUTE
MUTE
SIDETONE
SIDETONE
Reg 08h
Σ
Reg 08h
Σ
1 dB Steps, Reg 06h
1 dB Steps, Reg 04h
PD, Rev 4.8, April 2009
+6 to -73dB
+6 to -73dB
MUTE
MUTE
VOL/
VOL/
WM8731
ADC
Production Data
To
DRIVER
DRIVER
H/P
H/P
21
LOUT
LHPOUT
HPVDD
RHPOUT
ROUT
HPGND