AK5397 Datasheet, PDF (40/44 Pages) Asahi Kasei Microsystems – 32-Bit Stereo Premium ADC

[AK5397]
Figure 41 shows an input buffer circuit example 1. (1^st order HPF; fc=0.795Hz, 2^nd order LPF; fc=290kHz,
gain=963 dB). 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 17.0Vpp (AK5397: 5.6Vpp
Typ.). When using this circuit, analog characteristics at fs=48kHz is DR=127dB, S/(N+D)=100dB.
Resistor values should be in ±1% accuracy.
When the bias voltage is more than 0.28xAVDD+0.6 [V], the internal diode is powered up.
1.0k
300
Analog In
1.0k ^VP+
-
JP1
Vin+
220µ
+
910
-
100
5
8.5Vpp
+
+
VP-
Bias
LME49990
LME49990
2.80Vpp
AK5397 AIN+
33n
VA+
1100
+
680
10µ
XLR
300
Bias
0.1µ
JP2
Vin-
VA=+5V
VP=15V
220µ
+ ⁹¹⁰ _-
100
5
+
LME49990
Bias
Figure 41. Analog Input Buffer Circuit Example 2
33n
2.80Vpp
AK5397 AIN-
33n
fin
1Hz
10Hz
Frequency Response -2.1dB -0.03dB
Table 17. Frequency Response of HPF
fin
20kHz 40kHz 80kHz
Frequency Response -0.01dB -0.02dB -0.08dB
Table 18. Frequency Response of LPF
6.144MHz
33.82dB
014011535-E-00
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2014/11