ak5385b AKM Semiconductor, Inc., ak5385b Datasheet - Page 19

• Manufacturer Part Number: ak5385b
• Description: 24bit 192khz ?? Adc
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
4. External Analog Circuit Examples
Figure 6 shows an input buffer circuit example 1. This is a full-differential input buffer circuit with an inverted-amp (gain:
−10dB). The capacitor of 10nF between LIN+/− (RIN+/−) decreases the clock feed through noise of modulator, and
composes a 1st order LPF (fc=360kHz) with 22Ω resistor before the capacitor. This circuit also has a 1st order LPF
(fc=370kHz) composed of op-amp. The evaluation board should be referred about the detail.
Figure 7 shows an input buffer circuit example 2. (1
gain=−14dB, Table 7). 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 +/−14.7Vpp.
MS0406-E-00
BNC
Analog In
4.7k
10k
10k
9.56Vpp
VA
0.1µ
4.7k
NJM5534
JP1
10µ
Frequency Response
JP2
Frequency Response
Bias
4.7k
XLR
fin
14.7Vpp
14.7Vpp
Vin-
Table 6. Frequency Response of HPF
Table 7. Frequency Response of LPF
NJM5532
Vin+
VP- = -15V
4.7k
VA = 5V
VP+ = 15V
fin
Figure 6.Input Buffer example
Figure 7.Input Buffer example
VP+
VP-
10µ
22µ
22µ
st
47µ
47µ
0.1µ
−0.005dB
order HPF: fc=0.66Hz, Table 6; 1
VA
20kHz
- 19 -
3k
3k
Bias
1k
1k
4.7k
4.7k
Bias
−1.56dB
10k
10k
1Hz
Bias
470p
470p
910
910
−0.02dB
NJM5534
NJM5534
40kHz
22
22
−0.02dB
10Hz
2.9Vpp
10n
91
91
1.5n
6.144MHz
−15.6dB
2.9Vpp
2.9Vpp
2.9Vpp
st
order LPF: fc=590kHz,
100
4
5
LIN+
LIN-
4
5
AK5385B
LIN+
LIN-
AK5385B
[AK5385B]
2005/08