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TS615 데이터시트(PDF) 23 Page - STMicroelectronics

부품명 TS615
상세설명  DUAL WIDE BAND OPERATIONAL AMPLIFIER WITH HIGH OUTPUT CURRENT
PDF  27 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TS615 데이터시트(HTML) 23 Page - STMicroelectronics

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TS615
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POWER DOWN MODE BEHAVIOUR
Figure 66 : Equivalent Schematic
Please note that the short circuited output in pow-
er down mode is referenced to (-VCC). No problem
appears when used in differential mode. Never-
theless, when used in single ended on a load ref-
erenced to GND, the (-VCC) level contributes to a
current consumption through the load. As de-
scribed on the Figure 68, the interest of featuring
an output short circuit in power down mode is to
keep the best impedance matching between the
system and the twisted pair telephone line when
the modem is in sleep mode. By this way, the mo-
dem can be waked-up with a signal from the line
without any damage of this signal. This concept is
particularly intended for the ADSL over voice mo-
dems, where the modem in sleep mode, must be
waked-up by the phone call.
Figure 67 : Matching in Sleep Mode
Figure 68 : Standby Mode. Time On
>Off
Figure 69 : Standby Mode. Time Off
>On
Figure 70 : Standby Mode. Input/Output Isolation
vs. Frequency
AV=+4, Rfb=620Ω, VCC=±6V, Vout=3Vp
.
+
_
..
Vcc -
Vcc +
Ouput 1
.
Rpdw
+
_
.
..
Vcc +
Vcc -
Ouput 2
.
A2
Rpdw
-Vcc
POWER
DOWN
pin6
-Vcc
A1
1
..
4
5
2
3
12
11
10
13
14
POWER
DOWN
pin6
TS615
1:2
Transformer
Line (100
Ω)
Consumption=80
µA
POWER DOWN
25
Ω
12.5
Ω
12.5
Ω
5
Ω max.
The system can be waked-up
from the line
Matching
TS615
1:2
Transformer
Line (100
Ω)
Consumption=80
µA
POWER DOWN
25
Ω
12.5
Ω
12.5
Ω
5
Ω max.
The system can be waked-up
from the line
Matching
0
1020
304050
-6
-5
-4
-3
-2
-1
0
Vout
Vpdw
Disabled Output
Enabled Output
Time (
µs)
012
345
−6
−5
−4
−3
−2
−1
0
1
Disabled Output
Enabled Output
Vpdw
Vout
Time (µs)
10k
100k
1M
10M
-130
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
Frequency (Hz)



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