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參數(shù)資料
| 型號(hào)： | AKD5394A |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 英文描述： | Super High Performance 192kHz 24-Bit ADC |
| 中文描述： | 超高性能192kHz的24位ADC |
| 文件頁數(shù)： | 22/24頁 |
| 文件大小： | 174K |
| 代理商： | AKD5394A |
ASAHI KASEI
[AK5394A]
MS0137-E-01
2002/07
- 22 -
6.
Noise floor of AK5394A
The AK5394A has a sprious noise of about
135dBFS on the noise floor of Lch output at no signal input. When this noise
causes a trouble in system, it can be removed by adding a minute offset to the analog inputs of both channels externally
using a circuit as Figure 13. The relationship between the frequency range (f
T
) of the sprious noise to be removed and the
adding offset voltage (V
of
) is f
T
[kHz] = 20 x V
of
[mV]
20. The example is shown in Table 10.
Sprious noise Frequency
0
～
20kHz
0
～
40kHz
0
～
80kHz
Table 10. Sprious noise Frequency vs. Offset voltage
Offset Voltage
+2mV
+3mV
+5mV
A resistor, R in Figure 13 should be 8
to add an offset of 2mV to the analog inputs. The relationship between R and V
of
is shown by the following equation.
]
[
20
V
R
k
R
V
of
×
+
=
An offset voltage of the op-amps should be considered in the actual circuit. For example, when removing the sprious noise
of 20kHz or less, the adding offset voltage should be 2+2=4mV if the op-amp has an offset of +/
2mV. In this case, the
dynamic range of the ADC output decreases 4mV.
-
+
91
3.3k
620
-
+
91
620
68μ
10
μ
+
10k
10k
0.1
μ
Bias+
5V
Bias+
1n
3.3k
1n
Bias-
2.2n
68μ
XLR
Vin+
Vin-
NJM5534
NJM5534
AK5394A AIN+
AK5394A AIN-
R
Bias-
Figure 13. Removing the sprious noise circuit
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