WM8711BL Wolfson Microelectronics, WM8711BL Datasheet - Page 16

• Manufacturer Part Number: WM8711BL
• Description: Ultra-Small Audio DAC
• Manufacturer: Wolfson Microelectronics

WM8711BL
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The software control for the line outputs is shown in Table 3.
Table 3 Output Software Control
The recommended external components are shown in Figure 9.
Figure 9 Line Outputs Application Drawing
Recommended values are C1 = 10 µ F, 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 WM8711BL has a stereo headphone output available on LHPOUT and RHPOUT. The output is
designed specifically for driving 16 or 32 ohm 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
BYPASS
DACSEL
LABEL
C1
DEFAULT
AGND
1
0
R1
Bypass Switch
1 = Enable Bypass
0 = Disable Bypass
DAC Select
1 = Select DAC
0 = Don’t select DAC
R2
DESCRIPTION
PD, Rev 4.1, April 2007
AGND
Production Data
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