Veq
參數(shù)資料
型號: XRT5897IV-F
廠商: Exar Corporation
文件頁數(shù): 11/21頁
文件大?。?/td> 0K
描述: IC LIU E1 7CH 3.3V 100TQFP
產(chǎn)品變化通告: Product Discontinuation 18/Jan/2012
標(biāo)準(zhǔn)包裝: 90
類型: 線路接口裝置(LIU)
驅(qū)動器/接收器數(shù): 7/7
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: 100-LQFP
供應(yīng)商設(shè)備封裝: 100-TQFP(14x14)
包裝: 托盤
XRT5897
19
Rev. 1.11
This may be further simplified:
Figure 10. Equivalent Circuit
Veq
Vs
RT
I
Where:
RT = RSint + Rsext
Req =
RL
n2
Therefore:
I =
Vs
RT + Req
Veq = I Req
Vo = n Veq
And:
Return Loss = 20 log
RT+ Req
RT-- Req
Table 6.
contains the results of calculations made with these equations. The numbers show that output pulse amplitude
is within millivolts of the nominal values of 2.37V and 3.00V specified by ITU G.703 for 75W and 120W operation. Also,
the 1:2 ratio transformer provides an almost-perfect match for 75W operation, and return loss is well within the ETSI
specification for the 120W load.
Load Resistance
RL (W)
Pulse Amplitude
Vo (Volts Peak)
Output
Return Loss (dB)
75
2.43
31.3
120
3.01
13.8
Table 6. Calculated Transmitter Pulse Amplitude and Return Loss
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