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| 型号： | W671310P |
| 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： | 18/48页 |
| 文件大小： | 1344K |
| 代理商： | W671310P |
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W671300 SERIES
7.2.2.2. Feed Architecture
The design implements a voltage feed/current sense architecture. The device controls the voltage
across Tip and Ring though sensing of load current. Internal resistors (RCS) are placed in series with
Tip and Ring outputs to provide the current sensing. The diagram below illustrates the concept.
+
-
+
-
V
IN
V
OUT
R
C
R
CS
R
L
R
B
R
A
K
S
FIGURE 9: VOLTAGE FEED CURRENT SENSE DIAGRAM
By monitoring the current at the amplifier output, a negative feedback mechanism sets the output
voltage for a defined load. The amplifier gains are set by resistor ratios (RA, RB, RC) providing all the
performance benefits of matched resistors. The internal sense resistor, RCS, is much smaller than the
gain resistors and is typically 20 for this device. The feedback mechanism, KS, represents the
amplifier configuration providing the negative feedback.
7.2.2.3. Transhybrid Balance
The final step in completing the impedance synthesis design is calculating the necessary gains for
transhybrid balance. The AC feedback loop produces an echo at the VTX output of the signal injected
at VIN. The echo must be cancelled to maintain voice quality. Most applications will use a summing
amplifier in the CODEC front end as shown below to cancel the echo signal.
+
-
R
F
R
A
R
B
RSLIC
CODEC
+2.4V
RX OUT
TX IN
-IN
AUX
VTX
R
+ -
1:1
R
S
T
A
R
IN
FIGURE 10: TRANSHYBRID BALANCE INTERFACE
The resistor ratio, RF/RA, provides the final adjustment for the transmit gain, GTX (V2W to PCMi). The
transmit gain is calcualted using the following equation.
Publication Release Date: March 2004
- 25 -
Revision 0.5
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