參數(shù)資料
型號(hào)： LUCL9218AAR-DT
元件分類： 圓形連接器
英文描述： Circular Connector; MIL SPEC:MIL-C-5015; Body Material:Metal; Series:GT; No. of Contacts:3; Connector Shell Size:16; Connecting Termination:Solder; Circular Shell Style:Square Flange Receptacle; Body Style:Straight
中文描述： 低成本線接口
文件頁數(shù)： 21/30頁
文件大?。?/td> 378K
代理商： LUCL9218AAR-DT
Agere Systems Inc.
21
Data Sheet
November 2001
L9218A/G Low-Cost Line Interface
Applications
(continued)
dc Applications
(continued)
Ring Trip Detection
The ring trip circuit is a comparator that has a special input section optimized for this application. The equivalent
circuit is shown in Figure 15, along with its use in an application using unbalanced, battery-backed ringing.
Figure 15. Ring Trip Equivalent Circuit and Equivalent Application
Ring trip detection threshold is given by the following equation:
I
TH
(mA) =
Longitudinal Balance
The SLIC is graded to certain longitudinal balance specifications. The numbers are guaranteed by testing (Figure
5 and Figure 8). However, for specific applications, the longitudinal balance may also be determined by termination
impedance, protection resistance, and especially by the mismatch between protection resistors at tip and ring. This
can be illustrated by the following equation:
LB = 20 x log
where:
LB: longitudinal balance.
RP: protection resistor value in
.
ZT: magnitude of the termination impedance in
.
ε
: protection resistor mismatch in
.
: SLIC internal tip/ring sensing mismatch.
The
can be calculated using the above equation with these exceptions:
ε
=
0, ZT = 600
,
RP = 100
,
and the
longitudinal balance specification on a specific code.
Now with
available, the equation will predict the actual longitudinal balance for RP, ZT, and
ε
.
Be aware that ZT may vary with frequency for complex impedance applications.
+
–
R
TSP
R
LOOP
15 k
8.6 V
I
P
= I
N
R
TSN
3.32 M
/
3.40 M
C
RTS1
0.015
μ
F
PHONE
HOOK SWITCH
RC PHONE
V
RING
V
BAT
NSTAT
R
TSP
I
N
R
TSN
–
+
2.94 M
R
S
402
/
510
2799 (F)
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
RTSN M
[
(
)
+
[
R
S
×
]
0.015
2
×
(
2
–
+
×
RP
368
ZT
×
[
]
)
×
-------------------------------------------------------------------------------------------
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