ak5383 AKM Semiconductor, Inc., ak5383 Datasheet - Page 16

• Manufacturer Part Number: ak5383
• Description: Enhanced Dual Bit 96 Khz 24-bit Adc
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
Figure 7shows 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 AIN+ /- decreases the clock feed through noise of modulator, and composes
a 1st order LPF(fc=360kHz) with 22ohm resistor before the capacitor. This circuit also has a 1st order LPF(fc=370kHz)
composed of op-amp. In this example, the internal offset is removed by self calibration. The evaluation board should be
referred about the detail.
Figure 8 shows an input buffer circuit example 2. (1
14dB, Table 5). The analog signal is able to input through XLR or BNC connectors.
JP1 and JP2 for XLR input)
M0049-E-03
Analog In
10k
10k
VA+
4.7k
10
BNC
8.1Vpp
+
µ
-
+
NJM5534
0.1
. The input level of this circuit is +/-12.4Vpp (AK5383: +/-2.45Vpp Typ.).
Bias
JP1
µ
4.7k
4.7k
Frequency Response
VA= 5V
VP= 15V
NJM5532
JP2
4.7k
-
+
VP+
12.4Vpp
12.4Vpp
Frequency Response
XLR
VP-
Figure 7 Differential Input Buffer Example 1
Figure 8 Differential Input Buffer Example 2
Fin
Vin-
47
µ
Vin+
Table 4. Frequency Response of HPF
Table 5. Frequency Response of LPF
47
fin
µ
10u
Bias
st
22u
22u
3k
3k
Bias
order HPF; fc=0.66Hz, Table 4, 1
-0.005dB
0.1u
20kHz
- 16 -
+
-
VA
-
+
1k
1k
910
-1.56dB
910
470p
470p
1Hz
"L" at self calibration
4.7k
4.7k
-0.02dB
40kHz
Bias
10k
10k
-0.02dB
22
22
10Hz
NJM5534
-
+
-
+
NJM5534
6.144MHz
2.45Vpp
-15.6dB
2.45Vpp
(short JP1 and JP2 for BNC input, open
st
10n
order LPF; fc=590kHz, gain=-
180
180
1.5n
AIN+
AIN-
CAL
ZCAL
AK5383
AK5383 AIN+
AK5383 AIN-
2.45Vpp
100
2.45Vpp
[AK5383]
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