參數(shù)資料
型號(hào)： W671361Y
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)： 19/48頁(yè)
文件大小： 1344K
代理商： W671361Y
W671300 SERIES
GTX
G
– 24
RF
RA
--------
ZO
ZL 2RP ZO
+
(
)
--------------------------------------------
RF
RA
--------
–
=
(EQ. 49)
Most applications set RF = RA, making the device 2-wire to 4-wire gain equal the transmit gain.
Typically RA is greater than 20k to prevent loading of the device transmit output. The Value of the
RF resistor should be greater than the minimum load specification of the CODECs internal amplifier.
The resistor ratio, RF/RB, is determined by the transhybrid gain of the device, G44. RF is previously
defined by the transmit gain requirement and RB is calculated using the following equation.
RB
RA
G44
----------
=
RA
RIN
RS
----------
ZL 2RP ZO
+
ZO
---------------------------------------
=
(EQ. 50)
7.2.2.4. Power Dissipation
The power dissipated by the device during on-hook transmission is strictly a function of the quiescent
currents for each supply voltage during Forward Active operation.
PFAQ VBH I
×
BHQ
VBL IBLQ
×
VCC ICCQ
×
+
=
(EQ. 51)
Off-hook power dissipation is increased above the quiescent power dissipation by the DC load. If the
loop length is less than or equal to RKNEE, the device is providing constant current, IA, and the power
dissipation is calculated using the following equation.
PFA IA
( )
PFA Q
( )
VBLxIA
(
)
RLOOPxI2A
(
)
+
=
(EQ. 52)
If the loop length is greater than RKNEE, the device is operating in the constant voltage, resistive feed
region. The power dissipated in this region is calculated using the following equation.
PFA IB
( )
PFA Q
( )
VBLxIB
(
)
RLOOPxI2B
(
)
+
=
(EQ. 53)
Since the current relationships are different for constant current versus constant voltage, the region of
device operation is critical to valid power dissipation calculations.
7.2.3. REVERSE ACTIVE MODE
The Reverse Active mode (RA, 011) provides the same functionality as the Forward Active mode. On-
hook transmission, DC loop feed and voice transmission are supported. Likewise loop supervision is
provided by either the Switch Hook Detector (E0 = 1) or the Ground Key Detector (E0 = 0). The device
may be operated from either high or low battery.
During Reverse Active the Tip and Ring DC voltage characteristics exchange roles. That is, Ring is
typically 4V below ground and Tip is typically 4V more positive than battery. Otherwise, all feed and
voice transmission characteristics are identical to Forward Active.
- 26 -
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