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)： 27/46頁
文件大?。?/td> 790K
代理商： L9214A
Preliminary Data Sheet
October 2001
Low-Cost Ringing SLIC
L9214A/G
Agere Systems Inc.
27
Supervision
The L9214 offers the loop closure and ring trip supervi-
sion functions. Internal to the device, the outputs of
these detectors are multiplexed into a single package
output, NSTAT. Additionally, a common-mode current
detector for tip or ring ground detection is included for
ground key applications.
Loop Closure
The loop closure has a fixed typical 10 mA on- to off-
hook threshold in the active mode and a fixed 10 mA
on- to off-hook threshold from the scan mode. In either
case, there is a 2 mA hysteresis with V
CC
= 5.0 V and
with V
CC
= 3.3 V.
Ring Trip
The ring trip detector requires an external filter at the
input, minimizing external components. An R + R//C
combination of 75 k
and 133 k
//
1
μ
F, for a filter
pole at 3.3 Hz, is recommended for a 3 REN config-
uration. For a 5 REN configuration, a 150 k
and
100 k
//
1
μ
F (for a filter pole at 2.65 Hz) combination
is recommended.
The ring trip threshold is internally fixed and is indepen-
dent of battery voltage. The threshold, I
RT
= 20.1 mA.
Tip or Ring Ground Detector
In the ground key or ground start applications a com-
mon-mode current detector is used to indicate either a
tip- or ring-ground has occurred (ground key) or an off-
hook has occurred (ground start). The detection thresh-
old is set by connecting a resistor from ICM to V
CC
.
1000 * V
CC
/R
ICM
(k
) = I
TH
(mA)
where:
R
ICM
> 80 k
@ V
CC
= 3.3 V
R
ICM
> 150 k
@ V
CC
= 5.0 V
Additionally, a filter capacitor across R
ICM
will set the
time constant of the detector. No hysteresis is associ-
ated with this detector.
Power Ring
The device offers a ring mode, in which a power ring
signal is provided to the tip/ring pair. The standard
method of ringing is to perform trapezoidal ringing by
use of the state input pins. It is possible to select either
fast or slow slew rates to alter the crest factor of the
ringing signal. This allows designers to set the external
capacitors to a specific factor and change the ringing
frequency under software control while maintaining the
crest factor between 1.2 and 1.6 for the trapezoidal sig-
nal.
During the ring mode, it is also possible to supply a
pulse-width modulated, PWM, signal into the device
’
s
B1 input. This signal is used to produce the power ring
signal. This signal must be removed during nonring
mode states. The user may input any crest factor ring
signal using this method; thus, the device will support a
sine wave (crest factor 1.414) or a lower or higher crest
factor input for increased power efficiency ring signal.
Various crest factors are shown below.
12-3346a (F)
Note: Slew rate = 5.65 V/ms; trise = tfall = 23 ms; pwidth = 2 ms;
period = 50 ms.
Figure 10. Ringing Waveform Crest Factor = 1.6
12-3347a (F)
Note: Slew rate = 10.83 V/ms; trise = tfall = 12 ms; pwidth = 13 ms;
period = 50 ms.
Figure 11. Ringing Waveform Crest Factor = 1.2
TIME (s)
–
80
–
60
–
40
–
20
0
20
40
60
80
0.00
0.02 0.06
0.04 0.08
0.10
0.12
0.14
0.16
0.18
0.20
V
TIME (s)
–
80
–
60
–
40
–
20
0
20
40
60
80
0.00
0.02 0.06
0.04 0.08
0.10
0.12
0.14
0.16
0.18
0.20
V
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