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參數(shù)資料
| 型號： | STLC3055 |
| 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)： | 6/22頁 |
| 文件大?。?/td> | 153K |
| 代理商： | STLC3055 |
The line status (on/off hook) is monitored by the
SLIC’s supervision circuit. The off-hook threshold
can be programmed via the external resistor R
TH
in the range from 5mA to 9mA.
Independently on the programmed constant cur-
rent value, the TIP and RING buffers have a cur-
rent source capabilitylimited to 70mA typ.
Moreover the power available at Vbat is control-
led by the DC/DC converter that limits the peak
current drawn from the Vpos supply. The maxi-
mum allowed current peak is set by the R
SENSE
resistor and it is typically900mApk.
AC CHARACTERISTICS
The SLIC provides the standard SLIC transmis-
sion functions:
Input impedance synthesis:
can be real or
complex and is set by a scaled (x50) external
ZAC impedance.
Transmit and receive:
The AC signal present
on the 2W port (TIP/RING) is transferredto the
TX output with a -6dB gain and from the RX in-
put to the2W port with a 0dB gain.
2 to 4 wire conversion:
The balance imped-
ance can be real or complex, the proper can-
cellation is obtained by means of two external
impedanceZA and ZB.
Once in Active mode (D1=1) the SLIC can oper-
ate in different states setting properly D0 and D2
control bits(see also Table 2).
Table2. SLIC states in ACTIVE mode
D0
D1
D2
Operating Mode
0
1
0
Active Normal Polarity
0
1
1
Active Reverse Polarity
1
1
0
Active TTXinjection (N.P.)
1
1
1
Active TTXinjection (R.P.)
POLARITYREVERSAL
The D2 bit controls the line polarity, the transition
between the two polarities is performedin a ”soft”
way. This means that the TIP and RING wire ex-
change their polarities following a ramp transition
(see fig.3). The transition time is controlled by an
external capacitor CREV. This capacitor is also
setting the shape of the ringing trapezoidal wave-
form.
When the controlpins set batteryreversal the line
polarity is reversed with a proper transition time
setvia an externalcapacitor(CREV).
METERING PULSE INJECTION (TTX)
The metering pulses circuit consist of a burst
shaping generator that gives a square wave
shaped and a low pass filter to reduce the har-
monic distortionof theoutput signal.
The metering pulse is obtained starting from two
logicsignals:
CKTTX: is a square wave at the TTX fre-
quency (12 or 16KHz) and should be perma-
nently applied to the CKTTX pin or at least for
all the duration of the TTX pulse (including ris-
ing and decay phases).
D0: enable the TTX generation circuit and de-
finethe TTX pulse duration.
This two signals are then processed by a dedi-
cated circuitry integrated on chip that generate
the metering pulse as an amplitude modulated
shaped squarewave(SQTTX) (see fig.4).
Both the amplitude and the envelope of the
squarewave (SQTTX) can be programmed by
means of external components. In particular the
amplitude is set by the two resistors RLV and the
IL
Ilim
VL
Vbat (-50V)
10V
2Rp
(20 to
40mA)
Figure 2. DC characteristicin ACTIVE mode
GND
TIP
RING
dV/dT set
by CREV
4V typ.
40V typ
ON-HOOK
Figure 3. TIP/RINGtypical transition from
Directto ReversePolarity
STLC3055
6/22
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| STLC3055Q | WLL & ISDN-TA SUBSCRIBER LINE INTERFACE CIRCUIT |
| STLC3055QTR | WLL & ISDN-TA SUBSCRIBER LINE INTERFACE CIRCUIT |
| STLC3065 | WLL SUBSCRIBER LINE INTERFACE CIRCUIT |
| STLC3065QTR | WLL SUBSCRIBER LINE INTERFACE CIRCUIT |
| STLC3065Q | WLL SUBSCRIBER LINE INTERFACE CIRCUIT |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| STLC3055N | 制造商:STMicroelectronics 功能描述: |
| STLC3055N_09 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:WLL and ISDN-TA subscriber line interface circuit |
| STLC3055Q | 功能描述:電信線路管理 IC WLL/ISDN-A SLIC RoHS:否 制造商:STMicroelectronics 產(chǎn)品:PHY 接口類型:UART 電源電壓-最大:18 V 電源電壓-最小:8 V 電源電流:30 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray |
| STLC3055QTR | 功能描述:電信線路管理 IC WLL/ISDN-A SLIC RoHS:否 制造商:STMicroelectronics 產(chǎn)品:PHY 接口類型:UART 電源電壓-最大:18 V 電源電壓-最小:8 V 電源電流:30 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray |
| STLC3065 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:WLL SUBSCRIBER LINE INTERFACE CIRCUIT |
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