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參數(shù)資料
| 型號(hào)： | ISL5585GCRZ |
| 廠商： | INTERSIL CORP |
| 元件分類： | 模擬傳輸電路 |
| 英文描述： | 3.3V Ringing SLIC Family for Voice Over Broadband (VOB) |
| 中文描述： | TELECOM-SLIC, PQCC32 |
| 封裝： | 7 X 7 MM, LEAD FREE, PLASTIC, MO-220VKKC, QFN-32 |
| 文件頁(yè)數(shù)： | 11/24頁(yè) |
| 文件大?。?/td> | 455K |
| 代理商： | ISL5585GCRZ |
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11
The gain of the Transmit Amplifier, set by R
S
, determines
the programmed impedance of the device. The capacitor
C
FB
blocks the DC component of the loop current. The
ground symbols in the model represent AC grounds, not
actual DC potentials.
The Sense Amplifier is configured as a 4 input differential
amplifier with a gain of 3/4. The voltage at the output of the
sense amplifier (V
SA
) is calculated using superposition.
V
SA
1 is the voltage resulting from V1, V
SA
2 is the voltage
resulting from V2 and so on (reference Figure 4).
3
4
Where
V is equal to I
M
R
SENSE
(R
SENSE
= 20
)
The voltage at VTX is equal to:
V
TR
is defined in Figure 4, note polarity assigned to V
TR
:
Setting V
IN
equal to zero in EQ 18, defining Z
O
= -V
TR
/
I
M
and substituting it into EQ18 will enable the user to
determine the required feedback to match the line
impedance at V
2W
as shown in Equation 19.
2-Wire Impedance Matching
Z
O
is the source impedance of the device and is defined as.
Z
L
is the line impedance and R
P
is the external protection
resistor. R
S
is defined as:
V
SA
1
--
V
1
(
)
–
=
(EQ. 11)
V
SA
2
3
4
--
V
2
(
)
=
(EQ. 12)
V
SA
3
3
4
--
V
3
(
)
–
=
(EQ. 13)
V
SA
4
3
4
--
V
4
(
)
=
(EQ. 14)
V
SA
V
2
V
1
–
(
)
V
4
V
3
–
(
)
+
[
]
3
4
--
V
V
+
[
]
3
4
--
=
=
(EQ. 15)
V
SA
2
I
M
20
×
(
)
3
4
--
I
M
30
=
=
(EQ. 16)
V
TX
V
IN
R
S
IN
---------
–
V
SA
–
R
S
8k
-------
V
IN
R
S
IN
---------
–
I
M
30
(
)
–
R
S
8k
-------
=
=
(EQ. 17)
V
TR
2 V
TX
(
)
2 V
IN
R
S
IN
---------
I
M
30
(
)
R
S
8k
-------
+
=
=
(EQ. 18)
Z
O
-----------------
R
S
=
(EQ. 19)
Z
O
Z
L
2R
P
–
=
(EQ. 20)
R
S
133.33 Z
L
2R
P
–
)
=
(EQ. 21)
FIGURE 4. AC SIGNAL TRANSMISSION MODEL
AUX
TIP
RING
E
G
-
V
TR
I
M
V
TX
R
P
R
P
+
-
+
-
+
I
M
Z
L
+
R
+
-
R
R
SENSE
+
-
V
SA
=
I
M
30
SENSE
AMPLIFIER
I
X
I
X
+
-
I
X
+
-
+
-
+
-
I
M
+
-
20
I
M
+
20
I
M
V
2W
-
+
INTERSIL
ISL5585
V
TX
Z
0
1:1
+
-
C
FB
VFB
-IN
TA
R
R
R
S
8k
3R
3R
4R
4R
4R
4R
I
X
FEEDBACK
AMPLIFIER
RECEIVE BLOCK
V
1
V
2
V
3
V
4
-
+
-
R
SENSE
AMPLIFIER
FEED
AMPLIFIER
FEED
V
IN
FROM CODEC
R
IN
ISL5585
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