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參數(shù)資料
| 型號： | HC5509 |
| 廠商： | Intersil Corporation |
| 英文描述： | () |
| 中文描述： | （） |
| 文件頁數(shù)： | 3/7頁 |
| 文件大?。?/td> | 316K |
| 代理商： | HC5509 |
4-3
Equation 14 can be separated into two terms, the feedback
term (-4RS(1-ZO/RF) and the loop impedance term
(+4RS+R
L
). The +4RS term of the loop impedance is can-
celled by the -4RS term of the feedback. The result is shown
in Equation 15. Figure 3 is a schematic representation of
Equation 15.
R
L
To match the impedance of the SLIC to the impedance of the
load set
4RSRF
If RF is made to equal 4RS then:
R
L
Therefore to match the HC5509B, with RS equal to 50
, to a
600
load:
and
To prevent loading down the VTX output, the value of RF and
ZO are typically scaled by a factor of K = 100, therefore:
Since the impedance matching is a function of the voltage
gain, scaling of the resistors to achieve a standard value is
recommended.
For complex impedances the above analysis is the same.
Table 1 list the values of KRF, KZO for several worldwide
Typical
line
impedances.
HC5509A1R3060, HC5524 and the HC5517 are similar to
that of the HC5509B. The only exception is the HC5517 in
that the VFB feedback path is not connected. Other than that
the analysis are identical.
The
analysis
for
the
When matching a complex impedance some impedance
models (900 + 2.15
μ
F, K = 100) will cause the op amp feed-
back to be open at DC currents, bring the op amp to an out-
put rail. A resistor with a value of about 10 times the
reactance of the capacitor (21.6nF) at the low frequency of
interest (200Hz for example) can be placed in parallel with
V
IN
I
L
------------
4RSRF
-------
R
L
+
=
(EQ. 15)
V
L
-------------
4RSRF
R
L
+
=
V
IN
4RS--------
Load
SLIC
FIGURE 3. SCHEMATIC REPRESENTATION OF EQUATION 15
+
R
L
--------
=
(EQ. 16)
ZO
=
(EQ. 17)
RF
4RS
4 50
)
200
=
=
=
(EQ. 18)
R
L
ZO
600
=
=
(EQ. 19)
KRF
20k
=
KZO
60K
=
(EQ. 20)
KRF
20k
=
KZO
100 Resistive
)
--------------------------
+
=
(EQ. 21)
TABLE 1.
LOAD
IMPEDANCE
KRF
KZO
OPTIONAL PARALLEL
RESISTOR
HC5509B1: VFB CONNECTED
NA
NA
360k
360k
600
20k
60k
900
20k
90k
600
2.2
μ
F
20k
60k
22nF
725
2.2
μ
F
20k
72.5k
22nF
Application Note 9607
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HC55120CBZ | Low Power Universal SLIC Family |
| HC55120CMZ | Low Power Universal SLIC Family |
| HC55121IBZ | Low Power Universal SLIC Family |
| HC55121IMZ | Low Power Universal SLIC Family |
| HC55130IB96 | Low Power Universal SLIC Family |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HC-5509A1 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:SLIC Subscriber Line Interface Circuit |
| HC5509A1R3060 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:SLIC Subscriber Line Interface Circuit |
| HC5509B | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:ITU CO/Loop Carrier SLIC (12 pages) FN2799.6 |
| HC-5509B | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:SLIC Subscriber Line Interface Circuit |
| HC-5509B_03 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:ITU CO/Loop Carrier SLIC |
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