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| 型号： | LUCL9219GAR-D |
| 英文描述： | Low-Cost Line Interface with Reverse Battery and Dual Current Limit |
| 中文描述： | 低成本线接口，具有反向电池和双电流限制 |
| 文件页数： | 13/30页 |
| 文件大小： | 397K |
| 代理商： | LUCL9219GAR-D |
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20
Agere Systems Inc.
Data Sheet
November 2001
with Reverse Battery and Dual Current Limit
L9219A/G Low-Cost Line Interface
Applications (continued)
dc Applications (continued)
Rate of Battery Reversal
The rate of battery reversal is controlled or ramped by
capacitors FB1 and FB2. A chart showing FB1/FB2 val-
ues versus typical ramp rate is given below. Leave
FB1/FB2 open if it is not desired to ramp the rate of
battery reversal.
Table 12. FB1/FB2 Values vs. Typical Ramp Time
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 RLCTH. The supervision output bit (NSTAT) is
high in an on-hook condition. The off-hook comparator
goes low during an off-hook condition:
ITR (mA) = 0.4167 RLCTH (k
) – 1.9 mA ACTIVE
off-hook to on-hook
ITR (mA) = 0.4167 RLCTH (k
) + 2.7 mA SCAN
on-hook to off-hook
Figure 14. Off-Hook Detection Circuit
CFB1/CFB2
Transition Time
0.01
F
20 ms
0.1
F
220 ms
0.22
F
440 ms
0.47
F
900 ms
1.0
F
1.8 s
1.22
F2.25 s
1.3
F
2.5 s
1.4
F
2.7 s
1.6
F
3.2 s
RL
VBAT
VOH
–
IL
---------------------------- 2RP
–
RDC
–
=
RL
ITR
RP
RING
–
+
–
+
DCOUT
RLCTH
LCTH
NSTAT
TIP
0.125 V/mA
0.05 mA
12-2553 (F).f
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