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參數(shù)資料
| 型號： | L9214A |
| 英文描述： | CAP CER 220PF 3.15KVDC R3 RAD |
| 中文描述： | 低成本振鈴用戶接口 |
| 文件頁數(shù)： | 25/46頁 |
| 文件大?。?/td> | 790K |
| 代理商： | L9214A |
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Preliminary Data Sheet
October 2001
Low-Cost Ringing SLIC
L9214A/G
Agere Systems Inc.
25
Applications
(continued)
dc Loop Current Limit
In the active modes, dc current limit is programmable
via an external resistor. The resistor is connected
between I
PROG
and DCOUT. The loop current limit
(I
LOOP
) with 100
load is related to the R
IPROG
pro-
gramming resistor by:
I
LOOP
(mA) = 4 mA/k
* R
IPROG
(k
) + 2 mA
Note that the overall current-limit accuracy achieved
will be affected by the specified accuracy of the internal
SLIC current-limit circuit and the accuracy of the exter-
nal resistor.
The above equation describes the active mode steady-
state current-limit response. There will be a transient
response of the current-limit circuit upon an on- to off-
hook transition. Typical active mode transient current-
limit response is given in Table 18.
Table 18. Typical Active Mode On- to Off-Hook Tip/
Ring Current-Limit Transient Response
Overhead Voltage
Active Mode
The overhead is preprogrammed in the active mode.
Note that overhead is not symmetrical with respect to
tip and ring. Under default conditions, the tip to ground
voltage is 2.1 V to 2.6 V and the ring to battery over-
head is 14.5 V typical.
The default overhead provides sufficient headroom for
on-hook transmission of a +3.17 dBm signal into
600
.
+3.17 dBm = 10 log (Vrms
2
/ P
0
* R
600
)
dBm = 10 log (Vrms
2
/ 0.001 W * 600
)
+3.17 dBm = 10 log
Vrms
= 1.12 V and Vpeak = 1.58 V are supported.
Scan Mode
If the magnitude of the primary battery is greater than
a nominal
–
63 V, the magnitude of the open-loop tip
to ring voltage is clamped to between
–
42.5 V and
–
56.5 V.
Again, the overhead is not symmetrical with respect to
tip and ring. With the magnitude of the primary battery
greater than a nominal
–
63 V, the tip to ground voltage
is clamped between
–
0.1 V and
–
0.6 V and the ring to
ground voltage is clamped between
–
42.5 V and
–
56.5 V. If the magnitude of the primary battery is less
than a nominal
–
63 V, the tip to ground voltage is
–
0.1 V to
–
0.6 V and the ring to battery voltage is typi-
cally 17 V less than V
BAT1
.
On-Hook Transmission Mode
If the magnitude of the primary battery is greater than
63 V, the magnitude of the open-loop tip to ring voltage
will be greater than 42.5 V. If the magnitude of the pri-
mary battery is less than 63 V, the open-loop voltage
may be less than 42.5 V and is approximately 17 V less
than the magnitude of the primary battery voltage. For
primary battery voltages less than 70 V, the magnitude
of the ring to ground voltage will be less than 56.5 V.
Again, the overhead is not symmetrical with respect to
tip and ring. The tip voltage to ground is between
–
2 V
and
–
4.5 V and the ring to primary voltage is 14.5 V
typical.
Parameter
Value
I
LOOP
+ 60
Unit
mA
dc Loop Current: Active Mode
R
LOOP
= 100
On- to Off-hook
Transition t < 20 ms
dc Loop Current: Active Mode
R
LOOP
= 100
On- to Off-hook
Transition t < 30 ms
dc Loop Current: Active Mode
R
LOOP
= 100
On- to Off-hook
Transition t < 50 ms
I
LOOP
+ 20
mA
I
LOOP
mA
2
0.6 IV
R
×
)
-------------------------------
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| L9215A | 制造商:AGERE 制造商全稱:AGERE 功能描述:Short-Loop Sine Wave Ringing SLIC |
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| L9217A | 制造商:AGERE 制造商全稱:AGERE 功能描述:Low-Cost Line Interface with Reverse Battery and PPM |
| L9218A | 制造商:AGERE 制造商全稱:AGERE 功能描述:Low-Cost Line Interface |
| 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 |
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