- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄380765 > STLC3055QTR (意法半導(dǎo)體) WLL & ISDN-TA SUBSCRIBER LINE INTERFACE CIRCUIT PDF資料下載
參數(shù)資料
| 型號： | STLC3055QTR |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | WLL & ISDN-TA SUBSCRIBER LINE INTERFACE CIRCUIT |
| 中文描述： | 環(huán)路 |
| 文件頁數(shù)： | 5/22頁 |
| 文件大?。?/td> | 153K |
| 代理商： | STLC3055QTR |
The DC/DC converter controller is driving an ex-
ternal power MOS transistor (P-Channel) in order
to generate the negative battery voltage needed
for device operation.
The DC/DC converter controller is synchronised
withan externalCLK (125KHZtyp.).
From version marked STLC3055 A5, it can be
synchronised to an internalclock generatedwhen
the pin CLK is connected to CVCC. One sensing
resistor in series to Vpos supply allows to fix the
maximum allowed input peak current. This feature
is implemented in order to avoid overload on
Vpos supply in case of line transient (ex. ring trip
detection).
The typical value is obtained for a sensing resis-
tor equal to 110m
that will guarantee an aver-
age current consumptionfrom Vpos < 700mA.
When in on-hook the self generated battery volt-
age is setto a predefinedvalue.
This value can be adjusted via one externalresis-
tor (RF1) and it is typical -50V. When RING mode
is selectedthis value is increasedto -70V typ.
Once the line goes in off-hook condition, the
DC/DC converter automatically adjust the gener-
ated battery voltage in order to feed the line with
a fixed DC current (programmablevia RLIM) opti-
mising in this waythe power dissipation.
OPERATINGMODES
Power Down
DC CHARACTERISTIC & SUPERVISION
When this mode is selected theSLIC is switched
off and the TIP and RING pins are in high imped-
ance. Also the line detectors are disabled there-
fore the off-hookconditioncannot be detected.
This mode can be selected in emergency condi-
tion when it is necessary to cut any current deliv-
ered to the line.
This mode is also forced by STLC3055in case of
thermaloverload(Tj > 140
°
C).
In this case the device goes back to the previous
status as soon as the junction temperature de-
crease underthe hysteresisthreshold.
AC CHARACTERISTICS
The 2W port is set in high impedance, the TX
output buffer is a low impedance output, no AC
transmissionis possible.
High Impedance Feeding (HI-Z)
DC CHARACTERISTIC & SUPERVISION
This operating mode is normally selected when
the telephoneis in on-hookin order to monitorthe
line status keeping the power consumption at the
minimum.
The output voltage in on-hook condition is equal
to the self generated batteryvoltage(-50Vtyp).
When off-hook occurs the DET becomes active
(lowlogic level).
The off-hook threshold in HI-Z mode is the same
value asprogrammedin ACTIVE mode.
The DC characteristic in HI-Z mode is just equal
to the self generated battery with 2x(1500W+Rp)
in series (see fig.1), where Rp is the external pro-
tectionresistance.
AC CHARACTERISTICS
The AC impedance shown at the 2W port
(TIP/RING) is the same as the DC
TIP/RING AC impedance will be 2x(1500
+ Rp)
or high impedance.
one. The
Active
DC CHARACTERISTICS & SUPERVISION
When this mode is selected the STLC3055 pro-
vides both DC feedingand AC transmission.
The STLC3055 feeds the line with a constant cur-
rent fixed by RLIM (20mA to 40mA range). The
on-hook voltage is typically 40V allowing on-hook
transmission;the self generatedVbat is -50V typ.
If the loop resistance is very high and
current cannot reach the programmed constant
current feed value,the STLC3055 behaveslike a
40V voltage source with a series impedance
equal to the protection resistors 2xRp (typ.
2x41
) plus the internal resistance. Fig. 2 shows
thetypical DC characteristicin ACTIVE mode.
the line
Vbat
IL
VL
Vbat (-50V)
2x(R1+Rp)
Slope: 2x(R1+Rp)
(R1=1500ohm)
Figure 1. DC Characteristicin HI-Z Mode.
STLC3055
5/22
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| STLC3065 | WLL SUBSCRIBER LINE INTERFACE CIRCUIT |
| STLC3065QTR | WLL SUBSCRIBER LINE INTERFACE CIRCUIT |
| STLC3065Q | WLL SUBSCRIBER LINE INTERFACE CIRCUIT |
| STLC3080 | SUBSCRIBER LINE INTERFACE CIRCUIT |
| STLC5046 | PROGRAMMABLE FOUR CHANNEL CODEC AND FILTER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| STLC3065 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:WLL SUBSCRIBER LINE INTERFACE CIRCUIT |
| STLC3065Q | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:WLL SUBSCRIBER LINE INTERFACE CIRCUIT |
| STLC3065QTR | 制造商:STMicroelectronics 功能描述: |
| STLC3075 | 制造商:STMicroelectronics 功能描述: |
| STLC3075_09 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Integrated POTS interface for home access gateway and WLL |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。