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參數(shù)資料
| 型號： | AK4523VF |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 英文描述： | 20BIT STEREO ADC & DAC |
| 中文描述： | 20位立體聲ADC |
| 文件頁數(shù)： | 18/20頁 |
| 文件大小： | 161K |
| 代理商： | AK4523VF |
ASAHI KASEI
[AK4523]
M0021-E-03
1999/12
- 18 -
4. Analog Outputs
The analog outputs are also single-ended and centered around the VCOM voltage. The input signal range scales with the
supply voltage and nominally 0.58 x VREFH Vpp. The DAC input data format is 2’s complement. The output voltage is a
positive full scale for 7FFFFH(@20bit) and a negative full scale for 80000H(@20bit). The ideal output is VCOM voltage
for 00000H(@20bit). The internal switched-capacitor filter and continuous-time filter remove most of the noise generated
by the delta-sigma modulator of DAC beyond the audio passband.
DC offsets on analog outputs are eliminated by AC coupling since DAC outputs have DC offsets of a few mV. Figure 11
shows the example of external op-amp circuit with 6dB gain. The output signal is inverted by using the circuit in this case.
AOUTL
2.9Vpp
BIAS
Vop
Vop
Lch Out
5.22Vpp
10k
18k
27k
10u
+
4.7k
4.7k
0.1u
10u
+
-
+
27u
+
Rch Op-amp
Optional amp with 6dB gain
Vop=12V
NJM5532
Figure 11. External analog circuit example (gain=6dB)
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