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參數(shù)資料
| 型號： | AK4382 |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 英文描述： | 112dB 192kHz 24-BIT SCH DAC |
| 中文描述： | 一一二分貝192kHz的24位三星援 |
| 文件頁數(shù)： | 19/21頁 |
| 文件大小： | 251K |
| 代理商： | AK4382 |
ASAHI KASEI
[AK4382]
MS0034-E-00
2000/7
- 19 -
1. Grounding and Power Supply Decoupling
VDD and VSS are supplied from analog supply and should be separated from system digital supply. Decoupling capacitor,
especially 0.1
m
F ceramic capacitor for high frequency should be placed as near to VDD as possible. The differential
Voltage between VDD and VSS pins set the analog output range.
3. Analog Outputs
The analog outputs are full-differential outputs and 0.55 x VDD Vpp (typ) centered around the internal common voltage
(about AVDD/2). The differential outputs are summed externally, V
AOUT
=(AOUT+)-(AOUT-) between AOUT+ and
AOUT-. If the summing gain is 1, the output range is 5.5Vpp (typ @VREFH=5V). The bias voltage of the external
summing circuit is supplied externally. The input data format is 2’s complement. The output voltage (V
AOUT
) is a positive
full scale for 7FFFFF (@24bit) and a negative full scale for 800000H (@24bit). The ideal V
AOUT
is 0V for 000000H
(@24bit).
The internal switched-capacitor filter and external low pass filter attenuate the noise generated by the delta-sigma
modulator beyond the audio passband. DC offset on AOUT+/- is eliminated without AC coupling since the analog outputs
are differential. Figure 10 and 11 show the example of external op-amp circuit summing the differential outputs.
4.7k
4.7k
R1
4.7k
R1
4.7k
470p
Vop
470p
Vop
1k
1k
47u
0.1u
BIAS
AOUT-
AOUT+
3300p
When R1=200
W
fc=93.2kHz, Q=0.712, g=-0.1dB at 40kHz
When R1=180
W
fc=98.2kHz, Q=0.681, g=-0.2dB at 40kHz
Analog
Out
Figure 10. External 2
nd
order LPF Circuit Example (using op-amp with single power supply)
4.7k
4.7k
R1
4.7k
R1
4.7k
470p
+Vop
470p
-Vop
AOUT-
AOUT+
3300p
When R1=200
W
fc=93.2kHz, Q=0.712, g=-0.1dB at 40kHz
When R1=180
W
fc=98.2kHz, Q=0.681, g=-0.2dB at 40kHz
Analog
Out
Figure 11. External 2
nd
order LPF Circuit Example (using op-amp with dual power supplies)
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