Figure 10: Current Control Circuit 4.4 Receive Block The receive block contains three sub-blocks, which are internally connected: 1." />
參數(shù)資料
型號: AMIS-49250-XTP
廠商: ON Semiconductor
文件頁數(shù): 8/22頁
文件大?。?/td> 0K
描述: IC TXRX FIELDBUS MAU 44NQFP
標準包裝: 2,500
類型: 收發(fā)器
驅動器/接收器數(shù): 1/1
規(guī)程: MDS-MAU
電源電壓: 4.75 V ~ 6.2 V
安裝類型: 表面貼裝
封裝/外殼: 44-VFQFN 裸露焊盤
供應商設備封裝: 44-NQFP(7x7)
包裝: 帶卷 (TR)
AMIS-492x0
Figure 10: Current Control Circuit
4.4 Receive Block
The receive block contains three sub-blocks, which are internally connected:
1.
A band pass filter – to filter the desired incoming communication signal.
2.
Carrier detector – generates the RxA signal by detecting the signal amplitude.
3.
Zero-cross detector generates the RxS signal by detecting the high/low transitions of the Manchester code.
4.4.1. Band Pass Filter
The band pass filter is a series connection of a high-pass and a low-pass filters each having two poles. Each filter is comprised of a
voltage follower and on chip resisters, so only four external capacitors are necessary. The following figure shows an internal circuit and
the connection of external capacitors. Cut-off frequency, fL, of the high-pass filter is determined by C1 and C2 while cut-off frequency, fH,
of the low-pass filter is determined by C3 and C4.
2
1
2
F
1
F
C
*
C
*
R
*
R
1
2
1
L
f
π
=
1
F
2
F
R
2
1
L
Q
=
=0.95
4
3
4
F
3
F
C
*
C
*
R
*
R
1
2
1
H
f
π
=
4
3
C
L
*
44
.
0
Q
=
=0.95
The possible ranges of fL and fH are 1kHz ~ 10kHz and 10kHz ~ 100kHz, respectively.
The values in the following figure are
recommended to obtain 1kHz and 47.6kHz cut-off frequencies.
Rev. 6 | Page 16 of 22 | www.onsemi.com
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