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參數(shù)資料
| 型號(hào)： | HC5513BIM |
| 廠商： | Intersil |
| 文件頁數(shù)： | 3/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC SLIC DLC/FLC LP STDBY 22-DIP |
| 標(biāo)準(zhǔn)包裝： | 37 |
| 系列： | UniSLIC14 |
| 功能： | 用戶線路接口概念（SLIC） |
| 電路數(shù)： | 1 |
| 電流 - 電源： | 2.25mA |
| 功率（瓦特）： | 1.5W |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 22-DIP（0.400"，10.16mm） |
| 供應(yīng)商設(shè)備封裝： | 22-PDIP |
| 包裝： | 管件 |
| 包括： | 接地鍵檢測(cè)器，可編程回路電流檢測(cè)器，振鈴?fù)禉z測(cè)器，熱關(guān)機(jī) |
11
Transhybrid Circuit
The purpose of the transhybrid circuit is to remove the
receive signal (VRX) from the transmit signal (VTX), thereby
preventing an echo on the transmit side. This is
accomplished by using an external op amp (usually part of
the CODEC) and by the inversion of the signal from the
4-wire receive port (RSN) to the 4-wire transmit port (VTX).
Figure 17 shows the transhybrid circuit. The input signal will
be subtracted from the output signal if I1 equals I2. Node
analysis yields the following equation:
The value of ZB is then:
Where VRX/VTX equals 1/ A4-4.
Therefore:
Example:
Given: RTX = 20k, ZRX = 280k, ZT = 562k (standard
value), RF = 20 and ZL= 600,
The value of ZB = 18.7k.
Supervisory Functions
The loop current, ground key and the ring trip detector
outputs are multiplexed to a single logic output pin called
DET. See Table 1 to determine the active detector for a
given logic input. For further discussion of the logic circuitry
see section titled “Digital Logic Inputs”.
Before proceeding with an explanation of the loop current
detector, ground key detector and later the longitudinal
impedance, it is important to understand the difference
between a “metallic” and “l(fā)ongitudinal” loop currents. Figure
18 illustrates 3 different types of loop current encountered.
Case 1 illustrates the metallic loop current. The definition of
a metallic loop current is when equal currents flow out of tip
and into ring. Loop current is a metallic current.
Cases 2 and 3 illustrate the longitudinal loop current. The
definition of a longitudinal loop current is a common mode
VTX
RSN
TIP
RING
IM
ZTR
VTR
EG
VTX
IM
1000
VTX
ZRX
1
HC5513
RF
A = 4
+
-
+
-
+
-
+
-
ZT
+
-
VRX
+
-
A = 250
IM
ZL
FIGURE 16. SIMPLIFIED AC TRANSMISSION CIRCUIT
V
TX
R
TX
-----------
V
RX
Z
B
-----------
+
0
=
(EQ. 21)
Z
B
R
–
TX
V
RX
V
TX
-----------
=
(EQ. 22)
Z
B
R
TX
Z
RX
Z
T
-----------
Z
T
1000
------------- 2R
F
Z
L
++
Z
L
2R
F
+
--------------------------------------------
=
(EQ. 23)
HC5513
VTX
RSN
RTX
RFB
CODEC/
FILTER
I1
I2
VTX
ZRX
ZT
+
-
ZB
VRX
+
-
+
-
FIGURE 17. TRANSHYBRID CIRCUIT
HC5513
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