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| 型號(hào)： | L9218A |
| 英文描述： | CAP CER 330PF 3.15KVDC R3 RAD |
| 中文描述： | 低成本線接口 |
| 文件頁(yè)數(shù)： | 21/30頁(yè) |
| 文件大小： | 378K |
| 代理商： | L9218A |
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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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L9219A | 制造商:AGERE 制造商全稱:AGERE 功能描述:Low-Cost Line Interface with Reverse Battery and Dual Current Limit |
| L9222 | 功能描述:功率驅(qū)動(dòng)器IC Quad Inv Tran Switch RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時(shí)間: 下降時(shí)間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| L9222_04 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:QUAD INVERTING TRANSISTOR SWITCH |
| L9222D | 功能描述:功率驅(qū)動(dòng)器IC Quad Inv Tran Switch RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時(shí)間: 下降時(shí)間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| L9222-D | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:QUAD INVERTING TRANSISTOR SWITCH |
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