參數(shù)資料
型號(hào): IDT82P2521BH
廠商: IDT, Integrated Device Technology Inc
文件頁數(shù): 73/147頁
文件大小: 0K
描述: IC LIU E1 21+1CH SHORT 640-PBGA
標(biāo)準(zhǔn)包裝: 5
類型: 線路接口裝置(LIU)
規(guī)程: E1
電源電壓: 3.135 V ~ 3.465 V
安裝類型: 表面貼裝
封裝/外殼: 640-BGA 裸露焊盤
供應(yīng)商設(shè)備封裝: 640-PBGA-EP(31x31)
包裝: 托盤
其它名稱: 82P2521BH
IDT82P2521
21(+1) CHANNEL HIGH-DENSITY E1 LINE INTERFACE UNIT
Functional Description
31
December 7, 2005
3.1.1.2 Receive Single Ended Mode
Receive Single Ended mode can only be used in 75
coaxial cable
applications.
In Receive Single Ended mode, only External Impedance Matching is
supported. External Impedance Matching circuit uses an external
resistor (Rr) only. The value of the resistor is 18.75
(see Figure-11 for
details) when the single end is connected with a 2:1 transformer or is 75
(see Figure-12 for details) when the single end is connected without a
transformer.
In Receive Single Ended mode, the RIM pin should be left open and
the configuration of the R_TERM[2:0] bits (b2~0, RCF0,...) is ignored.
Figure-11 Receive Single Ended Line Interface with Co-
axial Cable (with transformer)
Figure-12 Receive Single Ended Line Interface with Co-
axial Cable (transformer-less, non standard compliant)
2:1
Rr
RTIPn
RRINGn
4.74 Vpp
470 nF
IM
Rr2
RTIPn
RRINGn
4.74 Vpp
470 nF
Rr1
Rr = Rr1 + Rr2 = 75
In this mode, port protection should be enhanced.
Note:
IM
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