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參數(shù)資料
| 型號： | HC5513BIP |
| 廠商： | INTERSIL CORP |
| 元件分類： | 模擬傳輸電路 |
| 英文描述： | TVS 1500W 43V UNIDIRECT SMC |
| 中文描述： | TELECOM-SLIC, PDIP22 |
| 封裝： | PLASTIC, MS-010-AA, DIP-22 |
| 文件頁數(shù)： | 13/18頁 |
| 文件大?。?/td> | 175K |
| 代理商： | HC5513BIP |
66
The function of this circuit is to maintain the tip and ring
voltages symmetrically around V
BAT
/2, in the presence of
longitudinal currents. The differential transconductance
amplifiers G
T
and G
R
accomplish this by sourcing or sinking
the required current to maintain V
C
at V
BAT
/2.
When a longitudinal current is injected onto the tip and ring
inputs, the voltage at V
C
moves from it’s equilibrium value
V
BAT
/2. When V
C
changes by the amount
V
C
, this change
appears between the input terminals of the differential
transconductance amplifiers G
T
and G
R
. The output of G
T
and G
R
are the differential currents
I
1
and
I
2
, which in
turn feed the differential inputs of current sources I
T
and I
R
respectively. I
T
and I
R
have current gains of 250 single
ended and 500 differentially, thus leading to a change in I
T
and I
R
that is equal to 500(
I
) and 500(
I
2
).
The circuit shown in Figure 20(B) illustrates the tip side of
the longitudinal network. The advantages of a differential
input current source are: improved noise since the noise due
to current source 2I
O
is now correlated, power savings due
to differential current gain and minimized offset error at the
Operational Amplifier inputs via the two 5k
resistors.
Digital Logic Inputs
Table 1 is the logic truth table for the TTL compatible logic
input pins. The HC5513 has two enable inputs pins (E0, E1)
and two control inputs pins (C1, C2).
The enable pin E0 is used to enable or disable the DET
output pin. The DET pin is enabled if E0 is at a logic level 0
and disabled if E0 is at a logic level 1.
The enable pin E1 gates the ground key detector to the DET
output with a logic level 0, and gates the loop or ring trip
detector to the DET output with a logic level 1.
A combination of the control pins C1 and C2 is used to
select 1 of the 4 possible operating states. A description of
each operating state and the control logic follow:
Open Circuit State (C1 = 0, C2 = 0)
In this state the SLIC is effectively off. All detectors and both
the tip and ring line drive amplifiers are powered down,
presenting a high impedance to the line. Power dissipation is
at a minimum.
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.
FIGURE 20A.
FIGURE 20B.
FIGURE 20. LONGITUDINAL IMPEDANCE NETWORK
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
HC5513
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
HC5513
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