AKD4359-SC 데이터 시트보기 (PDF) - Asahi Kasei Microdevices
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AKD4359-SC Datasheet PDF : 33 Pages
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ASAHI KASEI
[AKD4359-SC]
External analog circuit
The 2nd order LPF (fc=111.8kHz, Q=0.714) which adds differential outputs of the AK4359 is implemented on the board.
When the further attenuation of the out-band noise is needed, some additional LPF is required. Analog signal is output
through BNC connectors on the board. And the output level of the AK4359 is 5.68Vpp@5V.
22u
R1
AOUT
10k
C1
R4
R3
+Vop
R2
C2
-Vop
Analog
Out
fc=111.8kHz, Q=0.714, g=-0.04dB at 40kHz
Figure 4. On-board analog filter
R1
R2
R3
R4
C1
C2
1.5k
1.8k
2.2k
3.3k
820p
820p
Table 5. The value of R,C on this board
fin
20kHz
40kHz
Frequency Response
0.00dB -0.04dB
Table 6. Frequency Response of LPF
80kHz
-0.76dB
<Calculation>
Amplitude = 20 log
K
[dB],
[1-(f/fc)2] 2+[(1/Q)(f/fc)] 2
K=
R3+R4
R4
,
fc=
ω0
2π
,
ω0=
1
,
2C1C2R1R2
Q = 2πfc
1
+
1
1
+ 1−k
C1R1 C1R2 C2 R2
<KM079600>
-4-
2005/06
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