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参数资料
| 型号： | W671552P |
| 厂商： | WINBOND ELECTRONICS CORP |
| 元件分类： | 模拟传输电路 |
| 英文描述： | TELECOM-SLIC, PQCC28 |
| 封装： | PLASTIC, LCC-28 |
| 文件页数： | 4/42页 |
| 文件大小： | 1230K |
| 代理商： | W671552P |
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W671500 SERIES
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.
TIP
RING
+
-
-IN
VFB
VRX
VTX
R
+-
+
-
+-
1:1
20
3R
4R
3R
8K
R
S
C
FB
T
A
V
SA
FIGURE 4: AC SIGNAL TRANSMISSION MODEL
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.
The sense amplifier output voltage, VSA, as a function of Tip and Ring voltage and load is calculated
using the following equation.
VSA
VT VR
-
(
)
30
ZL
------
=
(EQ. 11)
The transmit amplifier provides the programmable gain required for impedance synthesis. In addition,
the output of this amplifier interfaces to the CODEC transmit input. The output voltage is calculated
using the following equation.
VVTX
VSA
RS
8e3
----------
=
(EQ. 12)
Once the impedance matching components have been selected using the design equations, the
equations above provide additional insight as to the expected AC node voltages for a specific Tip and
Ring load.
7.1.7.1. Resistive Impedance Synthesis
The source impedance of the device, ZO, can be calculated as follows.
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