AK5394A Datasheet, PDF (19/24 Pages) Asahi Kasei Microsystems – Super High Performance 192kHz 24-Bit ADC

ASAHI KASEI
[AK5394A]
4. External analog circuit
Figure 9 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 +/−12.7Vpp (AK5394A: +/−2.4Vpp Typ.). When using this circuit, analog
characteristics at fs=48kHz is DR=120dB, S/(N+D)=105dB.
Analog In
12.7Vpp
4.7k
4.7k ^VP+
-
+
VP-
NJM5534
620
JP1
Vin+ ^68µ _3.3k
1n
91
-
+
Bias
NJM5534
2.4Vpp
AK5394 AIN+
VA+
10k
+
10k
10µ
XLR
Bias
0.1µ
620
JP2
Vin-
VA=+5V
VP=±15V
68µ
1n
3.3k
-
91
+
NJM5534
Bias
Figure 9. Analog input buffer circuit example 1
2.2n
AK5394 AIN-
2.4Vpp
Fin
1Hz
10Hz
Frequency Response −1.77dB −0.02dB
Table 6. Frequency Response of HPF
Fin
20kHz
40kHz 80kHz 6.144MHz
Frequency Response 0.00dB 0.00dB 0.00dB −51.36dB
Table 7. Frequency Response of LPF
MS0137-E-01
- 19 -
2002/07