AKD4626 Datasheet, PDF (6/39 Pages) Asahi Kasei Microsystems – Evaluation board Rev.B for AK4626

ASAHI KASEI
n Analog output circuit
3.0Vpp
AK4626
ROUT1 28
LOUT1 27 ^{Same circuit}
22u
10k
ROUT2 26 ^{Same circuit}
LOUT2 25 ^{Same circuit}
ROUT3 24 ^{Same circuit}
LOUT3 23 ^{Same circuit}
NJM4580
+
-
4.7k
4.7k
220
330p
6.0Vpp
Signal
[AKD4626]
1st order LPF on this board
1) Frequency response of HPF
The HPF is implemented on board to cancel the DC offset of analog output of AK4626.
Frequency response of 1st-order HPF
| Amplitude |² = 1/{1+(fc/f)²}; fc=1/2πRC=0.7Hz@R=10k,C=22u
fin
20Hz
Frequency Response -0.006dB
2) Gain, S/N and frequency response of op-amp circuit
1st-order filter with non-inverting amp is implemented on board to double the analog output level and attenuate out-of-band
noise.
a) Gain
The gain is
1+4.7k/4.7k = +6.02dB.
Therefore the output level of this board is
0.51dBV(=3.0Vpp) + 6.02dB
= 6.53dBV = 6.00Vpp = 2.12Vrms.
<KM071600>
-6-
2003/4