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參數(shù)資料
| 型號： | LUCL9218AAR-D |
| 英文描述： | Low-Cost Line Interface |
| 中文描述： | 低成本線接口 |
| 文件頁數(shù)： | 20/30頁 |
| 文件大?。?/td> | 378K |
| 代理商： | LUCL9218AAR-D |
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20
Agere Systems Inc.
Data Sheet
November 2001
L9218A/G Low-Cost Line Interface
Applications
(continued)
dc Applications
(continued)
Loop Range
The equation below can be rearranged to provide the loop range for a required loop current:
Off-Hook Detection
The loop closure comparator has built-in longitudinal rejection, eliminating the need for an external 60 Hz filter. The
loop closure detection threshold is set by resistor R
LCTH
. The supervision output bit NSTAT is high in an on-hook
condition. The off-hook comparator goes low during an off-hook condition:
I
TR
(mA) = 0.4167 R
LCTH
(k
) – 1.9 mA ACTIVE off-hook to on-hook
I
TR
(mA) = 0.4167 R
LCTH
(k
) + 2.7 mA SCAN on-hook to off-hook
Figure 14. Off-Hook Detection Circuit
R
L
----------------------------
I
L
2R
P
–
R
DC
–
=
R
L
ITR
R
P
R
P
RING
–
+
–
+
DCOUT
R
LCTH
LCTH
NSTAT
TIP
0.125 V/mA
0.05 mA
12-2553 (F).f
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| LUCL9218AAR-DT | 制造商:AGERE 制造商全稱:AGERE 功能描述:Low-Cost Line Interface |
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| LUCL9219AAR-DT | 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 |
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