- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384393 > HC5515IP (INTERSIL CORP) ITU CO/PABX SLIC with Low Power Standby PDF資料下載
參數(shù)資料
| 型號(hào)： | HC5515IP |
| 廠商： | INTERSIL CORP |
| 元件分類： | 模擬傳輸電路 |
| 英文描述： | ITU CO/PABX SLIC with Low Power Standby |
| 中文描述： | TELECOM-SLIC, PDIP22 |
| 封裝： | PLASTIC, DIP-22 |
| 文件頁(yè)數(shù)： | 8/17頁(yè) |
| 文件大?。?/td> | 170K |
| 代理商： | HC5515IP |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)當(dāng)前第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)
62
Figure 14 shows the relationship between the saturation
guard voltage, the loop current and the loop resistance.
Notice from Figure 14 that for a loop resistance <1.2k
(R
SG
= 4.0k
) the SLIC is operating in the constant current
feed region and for resistances >1.2k
the SLIC is operating
in the resistive feed region. Operation in the resistive feed
region allows long loop and off-hook transmission by
keeping the tip and ring voltages off the rails. Operation in
this region is transparent to the customer.
The Saturation Guard circuit (Figure 12) monitors the tip to
ring voltage via the transconductance amplifier A
1
. A
1
generates a current that is proportional to the tip to ring
voltage difference. I
1
is internally set to sink all of A
1
’s
current until the tip to ring voltage exceeds 12.5V. When the
tip to ring voltage exceeds 12.5V (with no R
SG
resistor) A
1
supplies more current than I
1
can sink. When this happens
A
2
amplifies its input current by a factor of 12 and the current
through R
1
becomes the difference between I
2
and the
output current from A
2
. As the current from A
2
increases, the
voltage across R
1
decreases and the output voltage on R
DC
decreases. This results in a corresponding decrease in the
loop current. The R
SG
pin provides the ability to increase the
saturation guard reference voltage beyond 12.5V. Equation 3
gives the relationship between the R
SG
resistor value and
the programmable saturation guard reference voltage:
where:
V
SGREF
= Saturation Guard reference voltage, and
R
SG
= Saturation Guard programming resistor.
When the Saturation guard reference voltage is exceeded,
the tip to ring voltage is calculated using Equation 4:
where:
V
TR
= Voltage differential between tip and ring, and
R
L
= Loop resistance.
For on-hook transmission R
L
=
∞
, Equation 4 reduces to:
The value of R
SG
should be calculated to allow maximum
loop length operation. This requires that the saturation guard
reference voltage be set as high as possible without clipping
the incoming or outgoing VF signal. A voltage margin of -4V
HC5515
V
TX
R
RX
R
DC1
R
DC2
C
DC
RSN
R
DC
I
RSN
TIP
RING
-2.5V
I
RING
I
TIP
A
2
I
TIP
I
RING
R
SG
R
SG
-5V
LOOP CURRENT
CIRCUIT
SATURATION GUARD
CIRCUIT
A
1
I
1
I
2
R
1
+
-
+
-
+
-
+
-
FIGURE 12. DC LOOP CURRENT
-5V
-5V
17.3k
0
1.2K
-50
-40
-30
-20
-10
0
V
BAT
= -48V, I
L
= 23mA, R
SG
= 4.0k
SATURATION
GUARD VOLTAGE
LOOP RESISTANCE (
)
FIGURE 13. V
TR
vs R
L
V
TIP
V
RING
RESISTIVE FEED
REGION
T
CONSTANT CURRENT
FEED REGION
SATURATION
GUARD VOLTAGE
∞
0
10
20
30
0
10
20
30
40
50
LOOP CURRENT (mA)
T
V
BAT
= -24V, R
SG
=
∞
V
BAT
= -48V, R
SG
= 4.0k
SATURATION GUARD
VOLTAGE, V
TR
= 38V
RESISTIVE FEED
REGION
CONSTANT CURRENT
FEED REGION
R
SG
= 4.0k
R
SG
=
∞
100k
100k
4k
1.5k
2k
700
<400
<1.2k
R
L
R
L
SATURATION GUARD
VOLTAGE, V
TR
= 13V
FIGURE 14. V
TR
vs I
L
and R
L
V
SGREF
12.5
5
SG
--------------+
+
=
(EQ. 3)
V
TR
R
L
16.66
L
5
10
5
R
DC2
17300
+
(
)
+
R
DC1
+
----------------+
×
=
(EQ. 4)
V
TR
16.66
5
SG
--------------+
+
=
(EQ. 5)
HC5515
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HC5517B | Low Cost 3 REN Ringing SLIC for ISDN Modem/TA and WL |
| HC5517BCB | Low Cost 3 REN Ringing SLIC for ISDN Modem/TA and WL |
| HC5517BCM | Low Cost 3 REN Ringing SLIC for ISDN Modem/TA and WL |
| HC5517 | 3 REN Ringing SLIC For ISDN Modem/TA and WLL |
| HC5517CB | 3 REN Ringing SLIC For ISDN Modem/TA and WLL |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HC5515IP-5 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| HC5517 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:3 REN Ringing SLIC For ISDN Modem/TA and WLL |
| HC5517_00 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:3 REN Ringing SLIC For ISDN Modem/TA and WLL |
| HC55171 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:5 REN Ringing SLIC for ISDN Modem/TA and WLL |
| HC55171_03 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:5 REN Ringing SLIC for ISDN Modem/TA and WLL |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。