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WM9711 Datasheet(PDF) 60 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) 60 Page - Wolfson Microelectronics plc

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WM9711L
Production Data
w
PD Rev 4.1 April 2004
60
RECOMMENDED EXTERNAL COMPONENT VALUES
COMPONENT
REFERENCE
SUGGESTED
VALUE
DESCRIPTION
C1 - C6
100nF
De-coupling for DBVDD,DCVDD,TPVDD,AVDD,SPKVDD,HPVDD
C7 - C8
10uF
Reservoir capacitor for DVDD, AVDD. Should the supplies use separate sources then
additional capacitors will be required of each additional source.
C9
100nF
De-coupling for CAP2.
C10
10uF
Reservoir capacitor for CAP2
C11
100nF
De-coupling for VREF
C12
10uF
Reservoir capacitor for VREF
C13
100nF
De-coupling for MICBIAS - Not required if MICBIAS output is not used
C14
10uF
Reservoir capacitor for MICBIAS - Not required if MICBIAS output is not used
C27 and C28
22pF
Required when used with a parallel resonant crystal.
C15 - C20
1uF
AC coupling capacitors
C21 - C23
2.2uF
Output AC coupling capacitors to remove VREF DC level from outputs
C24 - C26
220
µF
Output AC coupling capacitors to remove VREF DC level from outputs.
R1
100k
Pull-up resistor, ensures that all circuit blocks are OFF by default
R2
100k
Pull down resistor, ensures that all circuit blocks are ON by default
XT
24.576MHz
AC'97 master clock frequency. A bias resistor is not required but if connected will not
affect operation if the value is large (above 1M
Ω)
Table 36 External Components Descriptions
Note:
1. For Capacitors C7, C8, C10, C12 and C14 it is recommended that very low ESR components are used.
LINE OUTPUT
The headphone outputs, HPOUTL and HPOUTR, can be used as stereo line outputs. The speaker
outputs, LOUT2 and ROUT2, can also be used as line outputs, if ROUT2 is not inverted for BTL
operation (INV = 0). Recommended external components are shown below.
HPGND
HPGND
LINE-OUT SOCKET
(LEFT)
C1
1uF
R1
100 Ohm
HPOUTL /
LOUT2
HPOUTR /
ROUT2
WM9711L
R2
100 Ohm
LINE-OUT SOCKET
(RIGHT)
C2
1uF
Figure 16 Recommended Circuit for Line Output
The DC blocking capacitors and the load resistance together determine the lower cut-off frequency,
fc. Assuming a 10 k
Ω load and C1, C2 = 10µF:
fc = 1 / 2
π (RL+R1) C1 = 1 / (2π x 10.1kΩ x 1µF) = 16 Hz
Increasing the capacitance lowers fc, improving the bass response. Smaller values of C1 and C2 will
diminish the bass response. The function of R1 and R2 is to protect the line outputs from damage
when used improperly.


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