參數(shù)資料
型號： WM9712LEFL
廠商： Wolfson Microelectronics
元件分類： Codec
英文描述： AC97 Audio and Touchpanel CODEC
中文描述： AC97音頻編解碼器和觸摸屏
文件頁數(shù)： 72/78頁
文件大小： 689K
代理商： WM9712LEFL
WM9712L
COMPONENT
REFERENCE
C1 - C6
C7 - C8
Production Data
w
PD Rev 4.0 December 2003
72
SUGGESTED
VALUE
100nF
10uF
DESCRIPTION
De-coupling for DBVDD,DCVDD,TPVDD,AVDD,SPKVDD,HPVDD
Reservoir capacitor for DVDD, AVDD. Should the supplies use separate sources then
additional capacitors will be required of each additional source.
De-coupling for CAP2.
Reservoir capacitor for CAP2
De-coupling for VREF
Reservoir capacitor for VREF
De-coupling for MICBIAS - Not required if MICBIAS output is not used
Reservoir capacitor for MICBIAS - Not required if MICBIAS output is not used
Required when used with a parallel resonant crystal.
AC coupling capacitors
Output AC coupling capacitors to remove VREF DC level from outputs
Output AC coupling capacitors to remove VREF DC level from outputs.
Pull-up resistor, ensures that all circuit blocks are OFF by default
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
)
C9
C10
C11
C12
C13
C14
100nF
10uF
100nF
10uF
100nF
10uF
22pF
1uF
2.2uF
220
μ
F
100k
24.576MHz
C27 & C28
C15 - C20
C21 - C23
C24 - C26
R1
XT
Table 46 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 LOUT2 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
WM9712L
R2
100 Ohm
LINE-OUT
SOCKET
(RIGHT)
C2
1uF
Figure 24 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
load and C1, C2 = 10
μ
F:
fc = 1 / 2
π
(R
L
+R
1
) C
1
= 1 / (2
π
x 10.1k
x 1
μ
F) = 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.
相關(guān)PDF資料
PDF描述
WM9712LEFT AC97 Audio and Touchpanel CODEC
WM9712LEFV AC97 Audio and Touchpanel CODEC
WM9712LSEFL AC97 Audio and Touchpanel CODEC
WM9712LSEFT AC97 Audio and Touchpanel CODEC
WM9712LSEFV AC97 Audio and Touchpanel CODEC
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
WM9712LEFL/RV 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:AC97 Audio and Touchpanel CODEC
WM9712LEFL/V 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:AC97 Audio and Touchpanel CODEC
WM9712LEFT 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:AC97 Audio and Touchpanel CODEC
WM9712LEFT/RV 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:AC97 Audio and Touchpanel CODEC
WM9712LEFV 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:AC97 Audio and Touchpanel CODEC
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