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參數(shù)資料
| 型號： | HC5515CMZ |
| 廠商： | INTERSIL CORP |
| 元件分類： | 模擬傳輸電路 |
| 英文描述： | ITU CO/PABX SLIC with Low Power Standby |
| 中文描述： | TELECOM-SLIC, PQCC28 |
| 封裝： | ROHS COMPLIANT, PLASTIC, MS-018AB, LCC-28 |
| 文件頁數(shù)： | 11/20頁 |
| 文件大?。?/td> | 469K |
| 代理商： | HC5515CMZ |
11
FN4235.6
June 6, 2006
For applications where the 2-wire impedance (Z
TR
,
Equation 15) is chosen to equal the line impedance (Z
L
), the
expression for A
4-2
simplifies to:
(AC) 4-Wire to 4-Wire Gain
The 4-wire to 4-wire gain is equal to V
TX
/V
RX
.
From Equations 9, 10 and 11 with E
G
= 0:
Transhybrid Circuit
The purpose of the transhybrid circuit is to remove the receive
signal (V
RX
) from the transmit signal (V
TX
), 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 (V
TX
). Figure 16 shows the transhybrid
circuit. The input signal will be subtracted from the output signal
if I
1
equals I
2
. Node analysis yields the following equation:
The value of Z
B
is then:
Where V
RX
/V
TX
equals 1/ A
4-4
.
Therefore:
Example:
Given: R
TX
= 20k
, Z
RX
= 280k
, Z
T
= 562k
(standard
value), R
F
= 20
and Z = 600
,
The value of Z
B
= 18.7k
Supervisory Functions
The loop current 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 and the longitudinal impedance, it is important to
understand the difference between a “metallic” and
“l(fā)ongitudinal” loop currents. Figure 17 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.
V
TX
R
SN
TIP
RING
I
M
1000
Z
TR
V
TR
E
G
-
V
TX
I
M
V
TX
Z
RX
1
HC5515
R
F
R
F
A = 4
+
-
+
-
+
+
-
Z
T
+
-
V
RX
+
-
A = 250
A = 250
I
M
Z
L
FIGURE 15. SIMPLIFIED AC TRANSMISSION CIRCUIT
A
4
2
–
Z
T
RX
----------
–
1
2
--
=
(EQ. 19)
A
4
4
–
V
RX
-----------
Z
T
RX
----------
–
Z
2R
+
------------
2R
F
Z
L
+
+
--------------------------------------------
=
=
(EQ. 20)
V
TX
-----------
V
B
-----------
+
0
=
(EQ. 21)
Z
B
R
–
TX
V
TX
-----------
=
(EQ. 22)
Z
B
R
TX
Z
T
----------
Z
--------------------------------------------
------------
2R
F
F
Z
L
+
+
L
+
=
(EQ. 23)
HC5515
V
TX
R
SN
R
TX
R
FB
CODEC/
FILTER
I
1
I
2
V
TX
Z
RX
Z
T
+
-
Z
B
V
RX
+
-
+
-
FIGURE 16. TRANSHYBRID CIRCUIT
HC5515
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HC5515 | ITU CO/PABX SLIC with Low Power Standby |
| HC5515CM | ITU CO/PABX SLIC with Low Power Standby |
| HC5515CP | ITU CO/PABX SLIC with Low Power Standby |
| HC5515IM | ITU CO/PABX SLIC with Low Power Standby |
| HC5515IP | ITU CO/PABX SLIC with Low Power Standby |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HC5515CP | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| HC5515IM | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Harris Corporation 功能描述: |
| HC5515IMR4717 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| HC5515IP | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| HC5515IP-5 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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