xrt5897 Exar Corporation, xrt5897 Datasheet - Page 19
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xrt5897
Manufacturer Part Number
xrt5897
Description
Xrt5897 -seven-channel E1 Line Interface
Manufacturer
Exar Corporation
Datasheet
1.XRT5897.pdf
(21 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
xrt5897IV-F
Manufacturer:
Exar Corporation
Quantity:
10 000
This may be further simplified:
Where:
Therefore:
And:
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.
R
V
V
R
I =
Return Loss = 20 log
Rev. 1.11
V
eq
o
T
s
eq
= n V
Figure 10. Equivalent Circuit
= RS
= I R
R
=
T
eq
int
R
eq
n
Vs
+ Req
2
L
+ Rs
ext
R
I
T
Table 6. Calculated Transmitter Pulse Amplitude and Return Loss
Load Resistance
R
R
T
T
-- R
+ R
R
120
L
eq
eq
75
V
(W)
eq
Pulse Amplitude
Vo (Volts Peak)
19
2.43
3.01
Return Loss (dB)
Output
31.3
13.8