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參數(shù)資料
| 型號(hào)： | HC5523IP |
| 廠商： | HARRIS SEMICONDUCTOR |
| 元件分類： | 模擬傳輸電路 |
| 英文描述： | LSSGR/TR57 CO/Loop Carrier SLIC with Low Power Standby |
| 中文描述： | TELECOM-SLIC, PDIP22 |
| 文件頁(yè)數(shù)： | 13/18頁(yè) |
| 文件大小： | 176K |
| 代理商： | HC5523IP |
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68
Active State (C1 = 0, C2 = 1)
The tip output is capable of sourcing loop current and for open
circuit conditions is about -4V from ground. The ring output is
capable of sinking loop current and for open circuit conditions is
about V
BAT
+4V. VF signal transmission is normal. The loop
current and ground key detectors are both active, E0 and E1
determine which detector is gated to the DET output.
Ringing State (C1 = 1, C2 = 0)
The ring relay driver and the ring trip detector are activated.
Both the tip and ring line drive amplifiers are powered down.
Both tip and ring are disconnected from the line via the
external ring relay.
Standby State (C1 = 1, C2 = 1)
Both the tip and ring line drive amplifiers are powered down.
Internal resistors are connected between tip to ground and
ring to V
BAT
to allow loop current detect in an off-hook
condition. The loop current and ground key detectors are
both active, E0 and E1 determine which detector is gated to
the DET output.
AC Transmission Circuit Stability
To ensure stability of the AC transmission feedback loop two
compensation capacitors C
TC
and C
RC
are required.
Figure 21 (Application Circuit) illustrates their use.
Recommended value is 2200pF.
AC-DC Separation Capacitor, C
HP
The high pass filter capacitor connected between pins HPT
and HPR provides the separation between circuits sensing
tip to ring DC conditions and circuits processing AC signals.
A 10nf C
HP
will position the low end frequency response
3dB break point at 48Hz. Where:
HP
where R
HP
= 330k
Thermal Shutdown Protection
The HC5523’s thermal shutdown protection is invoked if a
fault condition on the tip or ring causes the temperature of
the die to exceed 160
o
C. If this happens, the SLIC goes into
a high impedance state and will remain there until the
temperature of the die cools down by about 20
o
C. The SLIC
will return back to its normal operating mode, providing the
fault condition has been removed.
Surge Voltage Protection
The HC5523 must be protected against surge voltages and
power crosses. Refer to “Maximum Ratings” TIPX and
RINGX terminals for maximum allowable transient tip and
ring voltages. The protection circuit shown in Figure 21
utilizes diodes together with a clamping device to protect tip
and ring against high voltage transients.
Positive transients on tip or ring are clamped to within a
couple of volts above ground via diodes D
1
and D
2
. Under
normal operating conditions D
1
and D
2
are reverse biased
and out of the circuit.
Negative transients on tip and ring are clamped to within a
couple of volts below ground via diodes D
3
and D
4
with the
help of a Surgector. The Surgector is required to block
conduction through diodes D
3
and D
4
under normal
operating conditions and allows negative surges to be
returned to system ground.
TIP
RING
V
BAT
/2
G
T
G
R
I
1
I
1
I
2
I
2
I
T
I
R
R
LARGE
R
LARGE
V
T
+
-
I
LONG
I
LONG
HC5523
I
LONG
I
LONG
V
R
+
-
V
C
+
-
V
BAT
/2
V
C
R
LARGE
R
LARGE
TIP
RING
5k
5k
20
+
-
2I
0
I
1
I
1
G
T
TIP CURRENT SOURCE
WITH DIFFERENTIAL INPUTS
TIP DIFFERENTIAL
TRANSCONDUCTANCE
AMPLIFIER
FIGURE 20A.
FIGURE 20B.
FIGURE 20. LONGITUDINAL IMPEDANCE NETWORK
f
3dB
HP
)
----------------------------------------------------
=
(EQ. 28)
HC5523
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