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CS42438-DMZ bảng dữ liệu(PDF) 52 Page - Cirrus Logic

tên linh kiện CS42438-DMZ
Giải thích chi tiết về linh kiện  108 dB, 192 kHz 6-In, 8-Out TDM CODEC
PDF  61 Pages
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nhà sản xuất  CIRRUS [Cirrus Logic]
Trang chủ  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS42438-DMZ bảng dữ liệu(HTML) 52 Page - Cirrus Logic

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52
DS646F2
CS42438
8.1.2
Passive Input Filter w/Attenuation
Some applications may require signal attenuation prior to the ADC. The full-scale input voltage will scale
with the analog power supply voltage. For VA = 5.0 V, the full-scale input voltage is approximately
2.8 Vpp, or 1 Vrms (most consumer audio line-level outputs range from 1.5 to 2 Vrms).
Figure 23 shows a passive input filter with 6 dB of signal attenuation. Due to the relatively high input im-
pedance on the analog inputs, the full distortion performance cannot be realized. Also, the resistor divider
circuit will determine the input impedance into the input filter. In the circuit shown in Figure 23, the input
impedance is approximately 5 k
Ω. By doubling the resistor values, the input impedance will increase to
10 k
Ω. However, in this case the distortion performance will drop due to the increase in series resistance
on the analog inputs.
2700 pF
C0G
10
μF
2.5 k
Ω
AIN1+,2+,3+,4+
AIN1-,2-,3-,4-
ADC1-2
4.7
μF
2700 pF
C0G
10
μF
2.5 k
Ω
AIN5A,6A
AIN5B,6B
ADC3
2700 pF
C0G
10
μF
2.5 k
Ω
Ω
2.5 k
Ω
2.5 k
Ω
2.5 k
Figure 23. Passive Input Filter w/Attenuation



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