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PDF L3037 Data sheet ( Hoja de datos )
| Número de pieza | L3037 | |
| Descripción | SUBSCRIBER LINE INTERFACE CIRCUIT | |
| Fabricantes | STMicroelectronics | |
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L3037
SUBSCRIBER LINE INTERFACE CIRCUIT
MONOCHIP SILICON SLIC SUITABLE FOR
PUBLIC/PRIVATE APPLICATIONS
IMPLEMENTS ALL KEY FEATURES OF THE
BORSCHT FUNCTION
SOFT BATTERY REVERSAL WITH PRO-
GRAMMABLE TRANSITION TIME (3 to 100ms)
METERING PULSE INJECTION AND FILTER-
ING WITH MINIMAL COMPONENTS COUNT
(NO TRIMMING REQUIRED).
PROTECTION RESISTOR MISMATCH COM-
PENSATION
ON HOOK TRANSMISSION
LOOP START/GROUND START FEATURE
IND TEMP. RANGE:
-40°C TO +85°C
LOW POWER DISSIPATION IN ALL OPER-
ATING MODES
INTEGRATED ZERO CROSSING RELAY
DRIVER
INTEGRATED (NOISE-LESS) RING TRIP DE-
TECTION
VERY LOW NO. of STD TOLERANCE EX-
TERNAL COMPONENTS
SELECT PART FOR U.S. APPLICATIONS
(63dB TYP. LONG. BALANCE)
SURFACE MOUNT PACKAGE (PLCC44 or
BLOCK DIAGRAM
PLCC44
PQFP44(10 x 10)
ORDERING NUMBERS:
L3037FN
L3037QN
PQFP44)
INTEGRATED THERMAL PROTECTION
PIN TO PIN COMPATIBLE WITH L3035/36
DESCRIPTION
The L3037 subscriber line interface circuit is a bi-
polar device in 70V technology developed for cen-
tral office / loop carrier and private applications.
The L3037 is pin to pin and function compatible
with L3035/36. One particular pin (reserved in
L3035/36) is now used for reverse polarity transi-
tion time programming. The line polarity transition
is not affecting the AC signal transmission that
can continue also during the line voltage transi-
tion.L3037 is available in two different package
options: PLCC44 and PQFP44 (10 x 10mm).
December 1997
1/22
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
1 page  
DESCRIPTION (continued)
One special selection with high longitudinal balan-
ce performances allows to meet the United States
BELLCORE requirements for central office/loop
carrier and private applications.
The SLIC integrates loop start, ground start,
ground key on/off-hook, automatic ring-trip as well
as zero crossing ring relay driver.
Two to four wire conversion is implemented by the
SLIC for application with first generation COMBO.
In case of application with second generation (pro-
grammable) COMBO this function can be imple-
mented outside saving external components.
The L3037 offers programmable current limitation
(3 ranges), on hook transmission and low power
in all operating modes, power management is
controlled by a simple external low cost transistor.
Metering pulses are injected on the line via a sum-
ming node through TTXIN pin.
Metering pulse filtering is performed by means of a
simple RC network with standard tolerance compo-
nents. In case TTX function is not used this pin
must be connected to AGND. It is also possible to
use this pin to modify the DC voltage drop between
TIP/RING terminals and battery voltage for appica-
tions where it is important to optimize the battery
voltage supply versus the signal swing.
Effect of protection resistors mismatch are com-
pensated by a feedback loop on the final stage al-
lowing good long balance performances also with
large tolerance protection resistors (ex: PTC).
This function allow the L3037 to be fully conform
to BELLCORE power cross and surge test and
meet also the Longitudinal Balance Specification
without using matched PTC resistors.
An integrated thermal protection circuit forces the
L3037 in POWER DOWN (PD) mode when the
junction temperature exceeds 150°C Typ.
The L3037 is specified over -40°C to +85°C am-
bient temperature range.
The L3037 package is a surface mount PLCC44
or PQFP44.
FUNCTIONAL DESCRIPTION
L3037 is designed in 70V bipolar technology and
performs the telephone line interface functions re-
quired in both C.O. and PABX environments. The
full range of signal transmission, battery feed,
loop supervision are performed.
Signal transmission performance is compatible
with European and North American Standards
and with CCITT recommendations.
Ringing, overvoltage and power cross protection
are performed by means of external networks.
The signal transmission function includes both 2
to 4 wire and 4 to 2 wire conversion. The 2W ter-
mination impedance is set by means of an exter-
nal impedance which may be complex. The 2 to 4
L3037
wire conversion is provided by means of an exter-
nal network.
Such a network can be avoided in case of appli-
cations with COMBOII, in this case the 2 to 4 wire
conversion is implemented inside the COMBOII
by means of the programmable Hybal filter.
An additional input allows a metering pulse signal
to be added on the line.
The DC feed resistance is programmable with
one external resistor. Three different values of
current limitation (25, 44, 55mA)can be selected
by software through the parallel digital interface.
One external transistor reduces the power dissi-
pation inside the L3037 in the presence of a short
loop (limiting current region).
An additional supervisory function sets the TIP
lead into high impedance state in order to allow
application in ground start configurations.
The different L3037 operating modes are control-
led by a 4bit logic interface, two additional detec-
tor outputs provide ground key detection and ei-
ther hook state or ring trip detection.
SLIC OPERATING MODES
Through the L3037 digital interface it is possible
to select 5 different SLIC operating modes:
1) Active Mode (ACT)
2) Standby Mode (SBY)
3) Tip Open Mode (TO)
4) Power Down Mode (PD)
5) Ringing Mode (RNG)
In both ACT and SBY modes it is possible to se-
lect the reverse polarity (see control interface).
Transition from direct to reverse polarity is soft
and the transition time is defined by the external
capacitor CREV.
ACTIVE MODE (ACT)
This operating mode is set by the card controller
when the Off-Hook condition has been recognized.
When this operating mode is selected the two out-
put buffers (TIP/RING) can sink or source up to
100mA each. In case of Ground key or line termi-
nals to GND the output current is limited to 15mA
for the Tip wire and 30mA for the Ring wire.
As far as the DC characteristic is concerned three
different feeding conditions are present:
a) Current limiting region: the DC impedance of
the SLIC is very high ( 20Kohm) and therefore the
system works like a current source. Using the
L3037 digital interface it is possible to select the
value of the limiting current:
25mA, 44mA, or 55mA.
When the device is in limiting current region the
negative supply for the output buffer is fixed by
5/22
5 Page 
Figure 5: Typical Application Circuit for U.S. Application.
L3037
680nF
ELECTRICAL CHARACTERISTICS TEST CONDITION, unless otherwise specified: VCC = 5V;
VSS = -5V; VBAT = -48V; AGND = BGND; Direct Polarity; TA = 25°C.
Note: Testing of all parameters is performed at 25°C. Characterization as well as the design rules used
allow correlation of tested performances at other temperatures. All parameters listed here are
met in the range 0°C to +70°C. Functionality between -40°C and 85°C is verified.
Symbol
Parameter
INTERFACE REQUIREMENTS 2 WIRE PORT
Test Condition
Min. Typ. Max. Unit
Vab Overload Level Voice Signal
Rp +PTC = 50Ω
300Hz to 3.4KHz (*)
Zll Long Input Impedance
at SLIC terminals per wire
Ill Long Current Capab. ac
standby per wire (on HOOK)
active per wire (on HOOK)
Ill Longitudinal Current Capability active per wire off HOOK
(IT = Transversal current)
4 WIRE TRANS PORT
Vtx Overload Level
Vtoff Output Offset Voltage
Ztx Output Impedance
(*) At TIP/RING line connection with ZLINE (AC) = 600Ω. For any DC Loop current from 0mA to ILIM
4.1
17
17
75-IT
1.8
-350
Vpk
10 Ω
mApk
mApk
mApk
+350
10
Vpk
mV
Ω
11/22
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet L3037.PDF ] | |
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