参数资料
型号: XRT5894IV-F
厂商: Exar Corporation
文件页数: 8/19页
文件大小: 0K
描述: IC LIU E1 QUAD 64TQFP
标准包装: 160
类型: 线路接口装置(LIU)
驱动器/接收器数: 4/4
规程: E1
电源电压: 3.14 V ~ 3.47 V,4.75 V ~ 5.25 V
安装类型: 表面贴装
封装/外壳: 64-LQFP
供应商设备封装: 64-TQFP(10x10)
包装: 托盘
其它名称: 1016-1480
XRT5894IV-F-ND
XRT5894
16
Rev. 1.10
Output Transformer Selection
A 1:2 ratio transformer is recommended for both 75W and 120W operation because the transmitter, when equipped with
this device, meets both the ITU G.703 output pulse amplitude requirement and, the ETSI return loss specification.
Although a center--tapped output transformer is not required, choosing a part with a center-tapped secondary allows the
use of the same type of unit at the receiver input.
A theoretical justification for the 1:2 ratio transformer follows:
Figure 8. Transmitter Line Driver Model
VSpos
VSneg
RSneg
TRING
R4
RL
R3
RSpos
VO
TTIP
1:n
Where:
Vspos = Vsneg = 1.25V typical (Differential line driver peak output voltage swing)
Rspos = Rsneg = 0.8W typical (Differential line driver internal source resistance)
R3 = R4 = 9.1W (Differential line driver external source resistance from Figure 1)
RL = 75W or 120W (Transmitter load resistance)
n = 2 (Transformer turns ratio)
Vo = Transmitter peak output voltage (Measured across RL = 75W or RL = 120W )
Figure 9
may be converted to a single--ended model:
Figure 9. Single-ended Line Driver Model
RL
RSext
RSint
1:n
VO
VS
Where:
VS = ÷Vspos÷ + ÷Vsneg÷
RSint = RSpos + Rsneg
RSext = R3 + R4
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