Figure-17 Transmit Differential Line Inter" />
參數(shù)資料
型號: IDT82P2521BH
廠商: IDT, Integrated Device Technology Inc
文件頁數(shù): 81/147頁
文件大?。?/td> 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
39
December 7, 2005
Figure-17 Transmit Differential Line Interface with
Twisted Pair Cable (with Transformer)
Figure-18 Transmit Differential Line Interface with Co-
axial Cable (with transformer)
Figure-19 Transmit Differential Line Interface with
Twisted Pair Cable (transformer-less, non standard
compliant)
3.2.6.2 Transmit Single Ended Mode
Transmit Single Ended mode can only be used in 75
coaxial cable
applications.
In Transmit Single Ended mode, only Internal Impedance Matching is
supported. Internal Impedance Matching circuit uses an internal
programmable resistor (IM) only. The T_TERM[2:0] bits (b2~0, TCF0,...)
should be set to ‘011’. The output amplitude is 4.74 Vpp when PULS[3:0]
is ‘0001’ and the SCAL[5:0] bits (b5~0, SCAL,...) is ‘100001’.1
In Single Ended mode, special care has to be taken for termination
and overall setup. Refer to separate application note for details.
A 1:2 (step up) transformer should be used in application.
Figure-20 shows the connection for one channel.
Figure-20 Transmit Single Ended Line Interface with
Coaxial Cable (with transformer)
1:2
Rt
TTIPn
TRINGn
IM
6.0 Vpp
Rt
1:2
Rt
TTIPn
TRINGn
IM
4.74 Vpp
Rt
TTIPn
TRINGn
IM
3.0Vpp
In this mode, port protection
should be enhanced.
Note:
1. The waveform in this mode is not standard. However, if the arbitrary wave-
form generator is used, the waveform could pass the template marginally.
1:2
TTIPn
TRINGn
IM
4.74 Vpp
4.7 F
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