參數資料
型號: AKD4527B(AKD4527B)
廠商: Asahi Kasei Microsystems Co.,Ltd
英文描述: Evaluation board Rev.D for AK4527B
中文描述: 評估板Rev.D的AK4527B
文件頁數: 2/40頁
文件大小: 348K
代理商: AKD4527B(AKD4527B)
ASAHI KASEI
[AKD4527B Rev.D]
<KM063700>
- 2 -
’00/9
n
Consideration for analog input circuit
AK4527
1nF
470
+
Signal
10k
470
0.1u
22u
4.7k
4.7k
6.25Vpp
1.5Vpp
30
32
31
29
RIN+
RIN-
LIN-
LIN+
4.7k
2.4k
AVDD
4.7k
47u
BIAS
Same circuit
1.5Vpp
NJM5532
+
+
-
-
Op-amp circuit
HPF
LPF
1) Frequency response of HPF
The HPF is implemented on board to cancel the DC offset of analog output of AK4527B.
Frequency response of 1st-order HPF
|Amplitued|
2
= 1/{1+(fc/f)
2
}; fc=1/2
π
RC=
0.7Hz
@R=10k,C=22u
fin
20Hz
Frequency Response
-0.006dB
2) Gain and S/N of op-amp circuit
Two stages of inverting op-amp circuit are implemented on board to convert single-ended input to full-differential
input for ADC of AK4527B.
a) Gain
The gain of each op-amp circuit is as following table:
Gain[dB]
First step
-12.40
Second step
0.00
Therefore input level for this board is
-5.51dBV(=1.5Vpp)+12.40dB
= +6.89dBV = 6.25Vpp = 2.21Vrms.
b) S/N (Theory: BW=20k+A)
The output noise level of each op-amp circuit is as following table:
Noise[dBV]
First step
-120.56
Second step
-115.91
The noise level summing differential output of op-amp circuit is
-113.64dBV = -114.13dB (0dB = +0.49dBV = 3Vpp).
S/N of ADC is
104.5dB (measurement).
Therefore total S/N of op-amp circuit and ADC is
104.05dB
(measurement: 103.9dB).
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