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AFE032 数据表(PDF) 21 Page - Texas Instruments

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部件名 AFE032
功能描述  Power-Line Communications Analog Front-End
PDF  77 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

AFE032 数据表(HTML) 21 Page - Texas Instruments

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C =
3
1
2
f
Z
p
3
C
´
´
´
C =
4
1
2
f
Z
p
4
C
´
´
´
L =
3
Z
C
2
f
p
3
´
´
L =
4
Z
C
2
f
p
4
´
´
AFE032
www.ti.com
SBOS669A – AUGUST 2013 – REVISED DECEMBER 2013
The following steps can be used to quickly design the passive pass-band filter. (Note that these steps produce
an approximate result.)
1. Choose the filter characteristic impedance, ZC:
–
For a –6-db passband attenuation: R3 = R4 = ZC.
–
For a 0-db passband attenuation: R4 = ZC, R3 = 10 × ZC.
2. Calculate values for C3, C4, L3, and L4 using the following equations:
Table 2 and Table 3 show standard values for common applications.
Table 2. Recommended Component Values for Fourth-Order Passive Band-Pass Filters (0-dB Pass-Band
Attenuation)
FREQUENCY
RANGE
CHARACTERISTIC
R4
C3
C4
L3
L4
FREQUENCY BAND
(kHz)
IMPEDANCE
R3
(k
Ω)
(nF)
(nF)
(
μH)
(
μH)
CENELEC A
35 to 95
1 k
Ω
1 k
Ω
10
4.7
1.5
1500
4700
CENELEC B, C, D
95 to 150
1 k
Ω
1 k
Ω
10
1.7
1
1200
1500
SFSK
63 to 74
1 k
Ω
1 k
Ω
10
2.7
2.2
2200
2200
FCC and ARIB
15 to 600
100
Ω
100
Ω
1
100
2.2
27
1000
Table 3. Recommended Component Values for Fourth-Order Passive Band-Pass Filters (–6-dB Pass-
Band Attenuation)
FREQUENCY
RANGE
CHARACTERISTIC
C3
C4
L3
L4
FREQUENCY BAND
(kHz)
IMPEDANCE
R3
R4
(nF)
(nF)
(
μH)
(
μH)
CENELEC A
35 to 95
1 k
Ω
1 k
Ω
1 k
Ω
4.7
1.5
1500
4700
CENELEC B, C, D
95 to 150
1 k
Ω
1 k
Ω
1 k
Ω
1.7
1
1200
1500
SFSK
63 to 74
1 k
Ω
1 k
Ω
1 k
Ω
2.7
2.2
2200
2200
FCC and ARIB
15 to 600
100
Ω
100
Ω
100
Ω
100
2.2
27
1000
Avoid excessive capacitive loading when laying out the printed circuit board (PCB) traces from the inputs or
outputs of the Rx block components. Keeping the PCB capacitance from the inputs to ground, or outputs to
ground, below 100 pF is recommended.
Copyright © 2013, Texas Instruments Incorporated
Submit Documentation Feedback
21
Product Folder Links: AFE032



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