AKD4626A-B Datasheet, PDF (5/44 Pages) Asahi Kasei Microsystems – Multi-channel Audio CODEC.

ASAHI KASEI
„ Consideration for analog input circuit
3.0Vpp
AK4626A
RIN 32
LIN 31
22u
330
Op-amp circuit
330 ^NJM4580
+
-
6.0Vpp
Signal
[AKD4626A-B]
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
103.6dB (measurement).
Therefore total S/N of op-amp circuit and ADC is
103.59dB (measurement: 103.6dB).
<KM079800>
-5-
2005/11