AK5388 Datasheet, PDF (25/27 Pages) Asahi Kasei Microsystems – 120dB 24-bit 192kHz 4-Channel ADC

ASAHI KASEI
[AK5388]
4. External Analog Circuit Examples
Figure 19 shows an input buffer circuit example 1. (1^st order HPF; fc=0.70Hz, 2^nd order LPF; fc=320kHz, 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 +/-TBDVpp (AK5388: +/-2.9Vpp Typ.). When using this circuit, analog
characteristics at fs=48kHz is DR=120dB, S/(N+D)=TBDdB.
Analog In
TBDVp
4.7k
4.7k ^VP+
-
+
VP-
NJM5534
620
JP1
1n
Vin+ ^68µ _3.3k
91
-
+
Bias
NJM5534
2.9Vpp
AK5388 AIN+
VA+
10k
+
10k
10µ
XLR
Bias
0.1µ
JP2
VA=+5V
VP=±15V
620
68µ
1n
3.3k
-
91
Vin-
+
NJM5534
Bias
Figure 19.Input Buffer example1
2.2n
AK5388 AIN-
2.9Vpp
fin
1Hz
10Hz
Frequency Response −1.56dB −0.02dB
Table 7. Frequency Response of HPF
fin
20kHz
40kHz 6.144MHz
Frequency Response −0.005dB −0.02dB −15.6dB
Table 8. Frequency Response of LPF
Rev. 0.3
- 25 -
2007/10