AKD4586 Datasheet, PDF (2/46 Pages) Asahi Kasei Microsystems – Evaluation board Rev.B for AK4586

ASAHI KASEI
„ Consideration for analog input circuit
3.0Vpp
AK4586
RIN 33
LIN 32
10u
330
Op-amp circuit
330 ^NJM5532
+
-
6.0Vpp
Signal
Same circuit
1) Gain
Gain of analog input circuit is
330/(330+330) = -6.02dB.
Therefore input level for this board is
+0.51dBV(=3.0Vpp)+6.02dB
= +6.53dBV = 6.00Vpp = 2.12Vrms.
2) S/N of op-amp circuit (Theory: BW=20k+A)
Non-inverting amp is implemented on board. The output noise level of op-amp circuit is
-126.01dBV = -132.54dB (0dB=+6.53dBV).
S/N of ADC is
101.6dB (measurement).
Therefore total S/N of op-amp circuit and ADC is
101.60dB (measurement: 101.6dB)
[AKD4586]
<KM065102>
2
2005/7