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TS613 Scheda tecnica(PDF) 8 Page - STMicroelectronics

Il numero della parte TS613
Spiegazioni elettronici  STMicroelectronics Solutions for ADSL Line Interfaces
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TS613 Scheda tecnica(HTML) 8 Page - STMicroelectronics

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TA0313
STMicroelectronics Solutions for ADSL Line Interfaces
A good impedance matching assumes:
Equation 5
From Equation 3 and Equation 5 we derive:
Equation 6
By fixing an arbitrary value for R2 in Equation 6, we arrive at:
Finally, the values of R2 and R3 allow us to extract R1 from Equation 1 so that:
Equation 7
with GL the required gain.
Capabilities
The table below shows the calculated components for different values of k for a differential load of 25
Ω.
In all cases, R2=1000
Ω and the gain=16dB. The last column displays the maximum amplitude level on
the line regarding the TS613 maximum output capabilities (18Vp-p diff.) and a 1:2 line transformer ratio.
Measurement of power consumption in application
Conditions:
l Passive impedance matching
l Transformer turns ratio: 2
l Maximum level required on the line: 12.4Vpp
l Maximum output level of the driver: 12.4Vpp
GL (gain for the loaded system)
GL is fixed for the application requirements
GL=Vo/Vi=0.5(1+2R2/R1+R2/R3)/(1-R2/R3)
R1
2R2/[2(1-R2/R3)GL-1-R2/R3]
R2 (=R4)
Arbitrarily fixed
R3 (=R5)
R2/(1-Rs/0.5RL)
Rs
0.5RL(k-1)
Active matching
k
R1
(
Ω)
R3
(
Ω)
Rs
(
Ω)
TS613 Output Level to get
12.4Vpp on the line with a
turn ratio of 2.
(Vp-p diff)
Maximum Line Level
(Vp-p diff)
1.3
953
1400
3.75 (3.9//100)
8.06
27.5
1.4
590
1620
5 (10//10)
8.68
25.7
1.5
422
2000
6.36 (6.8//100)
9.35
25.3
1.6
316
2490
7.57 (8.2//100)
9.95
23.7
1.7
261
3300
8.71 (10//68)
10.52
22.3
Passive matching
12.4
18
Ro
1
2
--- RL
=
R2
R3
-------
1
2Rs
RL
-----------
=
R3
R2
1
2Rs
RL
-----------
--------------------
=
R 1
2R2
21
R2
R3
-------

 G
L
1
R2
R3
-------
--------------------------------------------------------
=


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