參數(shù)資料
型號(hào)： WM9703
廠商： Wolfson Microelectronics
英文描述： TVS UNIDIRECT 400W 22V SMA
中文描述： AC97音頻編解碼器2.1版
文件頁(yè)數(shù)： 29/30頁(yè)
文件大?。?/td> 239K
代理商： WM9703
Production Data
WM9703
WOLFSON MICROELECTRONICS LTD
PD Rev 3.4 January 2001
29
RECOMMENDED EXTERNAL COMPONENTS VALUES
COMPONENT
REFERENCE
C1 to C4
C5 to C17
SUGGESTED
VALUE
10nF
470nF
DESCRIPTION
De-coupling for DVDD and AVDD
AC coupling capacitors for setting DC level of analogue inputs to VCAP1.
Value chosen to give corner frequency below 20Hz for min 10K input impedance.
Reference de-coupling capacitors for ADC, DAC, Mixer and CAP2 references.
Ceramic type or similar.
C18
C19
C20
C21
C22
C23
C24
C25
C26
C27
C28
C29 to C33
C34 and C35
XT
1
μ
F
0.1
μ
F
10
μ
F
0.1
μ
F
10
μ
F
0.1
μ
F
10
μ
F
0.1
μ
F
10
μ
F
100nF
47nF
10
μ
F
22pF
24.576 MHz
3D low pass filter. This value sets nominal 100Hz.
3D high pass filter. This value sets nominal 1kHz.
Output AC coupling caps to remove VREF DC level from outputs.
Optional capacitors for better crystal frequency stability.
AC
’
97 master clock frequency. A bias resistor is not required, but if connected will not
affect operation if value is large (above 1M
).
Table 24 External Component Values
RECOMMENDATIONS FOR 3.3V OPERATION
The device
’
s performance with AVDD = 3.3V is shown in Electrical Characteristics.
In 3.3V analogue operation, mid-rail reference scales to 1.5V. All ADC and DAC references are 3/5
ths
of their nominal 5V value. Input and output signals that are 1Vrms in 5V applications, scale to
660mVrms in 3.3V applications. If 1Vrms output is required, the mixer gain adjust PGAs need to be
increased by 3 times 1.5dB steps.
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