參數(shù)資料
型號(hào)： W671352Y
廠商： WINBOND ELECTRONICS CORP
元件分類(lèi)： 模擬傳輸電路
英文描述： TELECOM-SLIC, QCC32
封裝： QFN-32
文件頁(yè)數(shù)： 6/48頁(yè)
文件大?。?/td> 1344K
代理商： W671352Y
W671300 SERIES
resistive feed.
The line segment IB represents the resistive feed portion of the load characteristic.
IB
VTR OC
(
)
RLOOP
------------------------
=
(EQ. 10)
7.1.7. Impedance Matching
The impedance of the device is programmed with the external component RS. RS is the gain setting
resistor for the Transmit Amplifier that provides impedance matching. If complex impedance matching
is required, then a complex network can be substituted for RS.
The feedback mechanism for monitoring the AC portion of the loop current consists of two amplifiers,
the Sense Amplifier (SA) and the Transmit Amplifier (TA). The AC feedback signal is used for
impedance synthesis. A detailed model of the AC feedback loop is provided below.
The gain of the transmit amplifier, set by RS, determines the programmed impedance of the device.
The capacitor CFB blocks the DC component of the loop current. The ground symbols in the model
represent AC grounds, not actual DC potentials.
AUX
TIP
RING
E
G
V
TR
I
M
V
TX
R
P
R
P
+
-
+
-
+
I
M
Z
L
+
-
R
+
-
R
SENSE
+ -
V
SA
= I
M 30
I
X
I
X
+
-
I
X
+
-
+
-
+
-
I
M
+
-
V
2W
+
-
W671300
V
TX
Z
0
1:1
+
-
C
FB
VFB
-IN
TA
R
S
8k
3R
4R
I
X
SENSE
FEEDBACK
RECEIVE BLOCK
V
1
V
2
V
3
V
4
+
-
20
IM
+
-
R
SENSE
AMPLIFIER
FEED
AMPLIFIER
FEED
V
IN
FROM CODEC
R
IN
AMPLIFIER
20
IM
FIGURE 4: AC SIGNAL TRANSMISSION MODEL
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 (VSA) is calculated using superposition. VSA1 is the voltage resulting
- 14 -
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