TS615 ST Microelectronics, Inc., TS615 Datasheet - Page 23

• Manufacturer Part Number: TS615
• Description: Dual Wide Band Operational Amplifier
• Manufacturer: ST Microelectronics, Inc.

POWER DOWN MODE BEHAVIOUR
Figure 66 : Equivalent Schematic
Please note that the short circuited output in pow-
er down mode is referenced to (-
appears when used in differential mode. Never-
theless, when used in single ended on a load ref-
erenced to GND, the (-
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
POWER DOWN
POWER DOWN
TS615
TS615
Consumption=80 A
Consumption=80 A
11
10
The system can be waked-up
The system can be waked-up
5
4
5
5
V
V
V
V
+
+
_
_
max.
max.
cc
cc
from the line
from the line
cc
cc
A2
A1
+
+
-
-
12
14
.
.
. .
3
1
12.5
12.5
12.5
12.5
V
. .
. .
CC
.
.
Matching
Matching
-Vcc
-Vcc
R
R
) level contributes to a
pdw
pdw
13
25
25
2
Ouput 1
Ouput 2
Transformer
Transformer
V
1:2
1:2
CC
POWER
POWER
DOWN
DOWN
). No problem
pin6
pin6
Line (100 )
Line (100 )
Figure 68 : Standby Mode. Time On Off
Figure 69 : Standby Mode. Time Off On
Figure 70 : Standby Mode. Input/Output Isolation
vs. Frequency
A
V
=+4, R
-100
-110
-120
-130
-10
-20
-30
-40
-50
-60
-70
-80
-90
0
10k
− 1
− 2
− 3
− 4
− 5
− 6
1
0
-1
-2
-3
-4
-5
-6
0
0
0
fb
=620 , V
Disabled Output
Vout
Vpdw
1
10
CC
Enabled Output
100k
=±6V, Vout=3Vp
Frequency (Hz)
20
2
Time (µs)
Time ( s)
Disabled Output
30
3
1M
Enabled Output
40
4
Vpdw
Vout
TS615
50
23/27
5
10M