AK5388_09 Datasheet, PDF (26/31 Pages) Asahi Kasei Microsystems – 120dB 24-bit 192kHz 4-Channel ADC

[AK5388]
4. External Analog Circuit Examples
Figure 23 shows an input buffer circuit example 1. (1^st order HPF; fc=0.70Hz, 2^nd order LPF; fc=351kHz, gain=-14.5dB).
The analog signal is able to input through XLR or BNC connectors. (short JP1 and JP2 for BNC input, open JP1 and JP2
for XLR input). The input level of this circuit is +/-15.0Vpp (AK5388: +/-2.8Vpp Typ.). When using this circuit, analog
characteristics at fs=48kHz is DR=120dB, S/(N+D)=110dB.
4.7k
4.7k ^VP+
Analog In
-
15.4Vpp
+
VP-
NJM5534
620
JP1
1n
Vin+ ^68µ 3.3k
91
-
Bias
+
NJM5534
2.9Vpp
AK5388 AIN+
VA+
10k
+
10k
10µ
Bias
JP2
Vin-
0.1µ
VA=+5
VP=±15
XLR
620
68µ _3.3k
1n
91
-
+
NJM5534
Bias
2.2n
AK5388 AIN-
2.9Vpp
Figure 23.Input Buffer example1
fin
1Hz
10Hz
Frequency Response −1.77dB −0.02dB
Table 8. Frequency Response of HPF
fin
20kHz
40kHz
80kHz
Frequency Response 0.00dB
0.00dB 0.00dB
Table 9. Frequency Response of LPF
6.144MHz
−49.68dB
MS1096-E-01
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2009/08