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| AK2301A Datasheet, PDF (18/20 Pages) Asahi Kasei Microsystems – 3.3V Single channel PCM CODEC LSI | |||
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ASAHI KASEI
AK2301A
Universal op-amps
The op-amps for construction of the external filter.
The AMP1(2)I is negative input and the AMP1(2)O is output of the op-amp.
- Circuit example
Please design output load may become 8kΩ or more. The output load includes a feedback resistor and
AC load. These op-amps are assumed to be used for 20kHz max cut off frequency LPF. And please
design the gain may become -12~6dB.
The following figure shows the circuit example.
C1
R1
AMP1(2)I
Load Z
R2
C3
C2
AMP1(2)O
VSS
Each parameter is calculated as is shown below.
LPF cut-off frequency fcL[Hz]ï¼ fcL=1/(2ÏR2C2)
Output load L[Ω]ï¼ L= R2Z/( R2+Z)
Gain A[dB]ï¼ A=20log (R2/ R1 )
HPF cut-off frequency fcH[Hz]ï¼ fcH=1/(2ÏR1C1)
<MS0300-E-00>
18
2004/3
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