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TS612 データシート(PDF) 9 Page - STMicroelectronics

部品番号 TS612
部品情報  DUAL WIDE BAND OPERATIONAL AMPLIFIER WITH HIGH OUTPUT CURRENT
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TS612 データシート(HTML) 9 Page - STMicroelectronics

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TS612
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Figure 5 : Equivalent schematic. Ro is the
synthesized impedance
Unlike the level Vo° required for a passive imped-
ance, Vo° will be smaller than 2Vo in our case. Let
us write Vo°=kVo with k the matching factor vary-
ing between 1 and 2. Assuming that the current
through R3 is negligeable, it comes the following
resistance divider:
After choosing the k factor, Rs will equal to
1/2RL(k-1).
A good impedance matching assumes:
From (4) and (5) it becomes:
By fixing an arbitrary value for R2, (6) gives:
Finally, the values of R2 and R3 allow us to extract
R1 from (1), and it comes:
with GL the required gain.
CAPABILITIES
The table below shows the calculated compo-
nents
for different values of k. In this case
R2=1000
Ω and the gain=16dB. The last column
displays the maximum amplitude level on the line
regarding the TS612 maximum output capabilities
(18Vpp diff.) and a 1:2 line transformer ratio.
POWER CONSUMPTION IN COMMUNICATION
Conditions:
Passive impedance matching
Transformer turns ratio: 2
Power Supply: 12V
Maximun level required on the line: 12.4Vpp
Maximum output level of the driver: 12.4Vpp
Crest factor: 5.3 (Vp/Vrms)
Power Supply: 12V
The TS612 power consumption during emission
on 900 and 4550 meter twisted pair telephone
lines: 450mW
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)
Abritrary fixed
R3 (=R5)
R2/(1-Rs/0.5RL)
Rs
0.5RL(k-1)
Ro
Vi.Gi
Iout
1/2
RL
Ro
kVoRL
RL
2Rs1
+
---------------------------
=
Ro
1
2
---RL 5
()
,
=
R2
R3
-------
1
2Rs
RL
---------- 6
()
,
=
R3
R2
1
2Rs
RL
----------
-------------------
=
R1
2R2
21
R2
R3
-------


GL
1
R2
R3
-------
--------------------------------------------------------- 7
()
,
=
Active matching
k
R1
(
Ω)
R3
(
Ω)
Rs
(
Ω)
TS612 Output
Level to get
12.4Vpp on
the line
(Vpp diff)
Maximum
Line level
(Vpp diff)
1.3
820
1500
3.9
8
27.5
1.4
490
1600
5.1
8.7
25.7
1.5
360
2200
6.2
9.3
25.3
1.6
270
2400
7.5
9.9
23.7
1.7
240
3300
9.1
10.5
22.3
Passive matching
12.4
18


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