參數(shù)資料
型號(hào)： HC55151CM
廠商： INTERSIL CORP
元件分類： 模擬傳輸電路
英文描述： Low Power Universal SLIC Family
中文描述： TELECOM-SLIC, PQCC32
封裝： PLASTIC, MS-016AE, LCC-32
文件頁(yè)數(shù)： 13/35頁(yè)
文件大?。?/td> 382K
代理商： HC55151CM
4-13
23. Four-WiretoTwo-WireGainTracking -
The 4-wire to 2-wire
gain tracking is referenced to measurements taken for
E
RX
= -10dBm, 1.0kHz signal, E
G
source removed from circuit,
R
L
= 600
and is computed using the following equation:
G
4-2
= 20
log (V
TR
/E
RX
) vary amplitude -40dBm to +3dBm,
or -55dBm to -40dBm and compare to -10dBm reading.
V
TR
, R
L
and E
RX
are defined in Figure 8. The level is specified at
the 4-wire receive port and referenced to a 600
impedance level.
24. Two-WireIdleChannelNoise -
The 2-wire idle channel noise
at V
TR
is specified with the 2-wire port terminated in 600
(R
L
)
and with the 4-wire receive port (VTX) floating (Reference
Figure 9).
25. Four-WireIdleChannelNoise -
The 4-wire idle channel noise
at V
TX
is specified with the 2-wire port terminated in 600
(R
L
).
The noise specification is with respect to a 600
impedance
level at V
TX
. The 4-wire receive port (VTX) floating (Reference
Figure 9).
26. HarmonicDistortion(2-Wireto4-Wire) -
The harmonic
distortion is measured within the voice band with the following
conditions. E
G
= 0dBm at 1kHz, R
L
= 600
. Measurement
taken at V
TX
. (Reference Figure 7).
27. HarmonicDistortion(4-Wireto2-Wire) -
The harmonic
distortion is measured within the voice band with the following
conditions. E
RX
= 0dBm0. Vary frequency between 300Hz and
3.4kHz, R
L
= 600
. Measurement taken at V
TR
. (Reference
Figure 8).
28. ConstantLoopCurrent -
The constant loop current is
calculated using the following equation:
I
L
= 1000/R
LIM
= V
TR
/600 (Reference Figure 10).
29. GroundKeyDetector -
(TRIGGER) Ground the Ring pin
through a 2.5k
resistor and verify that GKD goes low.
(RESET) Disconnect the Ring pin and verify that GKD goes
high.
(Hysteresis) Compare difference between trigger and reset.
30. ElectricalTest -
Not tested in production at -40
o
C.
Circuit Operation and Design Information
The UniSLIC14 family of SLICs are voltage feed current
sense
S
ubscriber
L
ine
I
nterface
C
ircuits (SLIC). For short
loop applications, the voltage between the tip and ring
terminals varies to maintain a constant loop current. For long
loop applications, the voltage between the tip and ring
terminals are relatively constant and the loop current varies
in proportion to the load.
The tip and ring voltages for various loop resistances are
shown in Figure 13. The tip voltage remains relatively
constant as the ring voltage moves to limit the loop current
for short loops.
The loop current for various loop resistances are shown in
Figure 14. For short loops, the loop current is limited to the
programmed current limit, set by RILIM. For long loop
applications, the loop current varies in accordance with
Ohms law for the given tip to ring voltage and the loop
resistance.
.
The following discussion separates the SLIC’s operation into
its DC and AC paths, then follows up with additional circuit
and design information.
DC Feed Curve
The DC feed curve for the UniSLIC14 family is user
programmable. The user defines the on hook and off hook
overhead voltages (including the overhead voltage for off
hook pulse metering if applicable), the maximum and
minimum loop current limits, the switch hook detect
threshold and the battery voltage. From these requirements,
the DC feed curve is customized for optimum operation in
any given application. An Excel spread sheet to calculate the
external components can be downloaded off our web site
www.intersil.com/telecom/unislic14.xls.
FIGURE 13. TIP AND RING VOLTAGES vs LOOP RESISTANCE
T
LOOP RESISTANCE (
)
0
-5
-10
-15
-20
-25
-30
-35
-50
-40
-45
200
600
1000 1400 1800 2000
4K
10K
6K
8K
CONSTANT
LOOP CURRENT
REGION
VBH = -48V
RD = 41.2k
ROH = 38.3k
RDC_RAC = 19.6k
RILim = 33.2k
CONSTANT TIP TO RING
VOLTAGE REGION
-44.5V
-2.5V
TIP
RING
FIGURE 14. LOOP CURRENT vs LOOP RESISTANCE
L
0
LOOP RESISTANCE (
)
200
600
1K
1.4K 1.8K
2.2K 2.6K
3.8K
3.0K 3.4K
35
30
25
20
15
10
5
CONSTANT
LOOP CURRENT
REGION
VBH = -48V
RD = 41.2k
ROH = 38.3k
RDC_RAC = 19.6k
RILim = 33.2k
CONSTANT TIP TO RING
VOLTAGE REGION
HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151
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