WM8731SEFL Wolfson Microelectronics, WM8731SEFL Datasheet - Page 29

• Manufacturer Part Number: WM8731SEFL
• Description: Audio CODECs Stereo Codec with H/P
• Manufacturer: Wolfson Microelectronics

Specifications of WM8731SEFL

• Number Of Adc Inputs: 1
• Number Of Dac Outputs: 1
• Conversion Rate: 96 KSPS
• Interface Type: Serial (2-Wire, 3-Wire, I2S)
• Operating Supply Voltage: - 0.3 V to + 3.63 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: QFN EP
• Minimum Operating Temperature: - 40 C
• Number Of Channels: 2 ADC/2 DAC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

WM8731 / WM8731L
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The software control for the line outputs is shown in Table 8.
Table 8 Output Software Control
The recommended external components are shown in Figure 20.
Figure 20 Line Outputs Application Drawing
Recommended values are C1 = 10μF, R1 = 47k, R2 = 100 Ω.
C1 forms a DC blocking capacitor to the line outputs. R1 prevents the output voltage from drifting so
protecting equipment connected to the line output. R2 forms a de-coupling resistor preventing
abnormal loads from disturbing the device. Note that poor choice of dielectric material for C1 can
have dramatic effects on the measured signal distortion at the output
HEADPHONE AMPLIFIER
The WM8731/L has a stereo headphone output available on LHPOUT and RHPOUT. The output is
designed specifically for driving 16 or 32 Ω headphones with maximum efficiency and low power
consumption. The headphone output includes a high quality volume level adjustment and mute
function.
0000100
Analogue
Audio Path
Control
REGISTER
ADDRESS
LINEOUT
BIT
3
4
5
SIDETONE
BYPASS
DACSEL
LABEL
C1
DEFAULT
AGND
1
0
0
R1
Bypass Switch
1 = Enable Bypass
0 = Disable Bypass
DAC Select
1 = Select DAC
0 = Don’t select DAC
Side Tone Switch
1 = Enable SideTone
0 = Disable Side Tone
R2
DESCRIPTION
PD, Rev 4.8, April 2009
AGND
Production Data
29