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STLC3055Q
WLL & ISDN-TA SUBSCRIBER LINE INTERFACE CIRCUIT
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STLC3055
WLL & ISDN-TA SUBSCRIBER LINE INTERFACE CIRCUIT
MONOCHIP SLIC OPTIMISED FOR WLL &
ISDN-TA APPLICATIONS
IMPLEMENT ALL KEY FEATURES OF THE
BORSHT FUNCTION
1: SINGLE SUPPLY (5.5 TO 15.8\/)
n BUILT IN DC/DC CONVERTER CONTROL-
SOFT BATTERY REVERSAL WITH PRO-
GRAMMABLE TRANSITION TIME.
ON-HOOK TRANSMISSION.
PROGRAMMABLE OFF-HOOK DETECTOR
THRESHOLD
METERING PULSE GENERATION AND FIL-
'' INTEGRATED RINGING
n INTEGRATED RING TRIP
gr PARALLEL CONTROL
INTERFACE (3.3V
LOGIC LEVEL)
PROGRAMMABLE CONSTANT CURRENT
SURFACE MOUNT PACKAGE
INTEGRATED THERMAL PROTECTION
-40 TO +85°C OPERATING RANGE
BLOCK DIAGRAM
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TQFP44
ORDERING NUMBERS: STLC3055Q
STLC3055QTR
DESCRIPTION
The STLC3055 is a SLIC device specifically de-
signed for WLL (Wireless Local Loop) and ISDN-
Terminal Adaptors. One of the distinctive charac-
teristic of this device is the ability to operate with
a single supply voltage (from +5.5V to +15.8V)
and self generate the negative battery by means
of an on chip DC/DC converter controller that
drives an external MOS switch.
The battery level is properly adjusted depending
on the operating mode. A useful characteristic for
D0 D 1 D2
INPUT LOGIC AND DECODER
Status and
RX SUPERVISION
C KTTX
TTX PROC
RTTX CAC ILTF RD IREF RLIM RTH AGND
REFERENCE CVCC
OUTPUT LOGIC
DRIVER STAGE
RSENSE
September 2000
STLC3055
DESCRIPTION (continued)
these applications is the integrated ringing gener-
The control interface is a parallel type with open
drain output and 3.3V logic levels.
The metering pulses are generated on chip start-
ing from two logic signals (0, 3.3V) one define the
metering pulse frequency and the other the me-
tering pulse duration. An on chip circuit then pro-
vides the proper shaping and filtering. Metering
pulse amplitude and shaping (rising and decay
time) can be programmed by external compo-
nents. A dedicated cancellation circuit avoid pos-
PIN CONNECTION
sible CODEC input saturation due to Metering
pulse echo.
Constant current feed can be set from 20mA to
40mA. Off-hook detection threshold is program-
mable from 5mA to 9mA.
The device, developed in BCD100ll technology
(100V process), operates in the extended tem-
perature range and integrates a thermal protec-
tion that sets the device in power down when T]
exceeds 140°C.
i_| |_I |_I |_I i_| |_I |_I i_| |_I |_I |_I
/ 44 43 42 41 40 39 38 37 36 35 34 N
DO I: 1 C) 33 [l CSVR
D1 E 2 32 Cl ILTF
D2 L 3 31 [l RD
PD I: 4 30 [l RTH
RES E 5 29 Cl IREF
N.C. E 6 28 [l RLIM
N,C. L 7 27 [l AGND
' E 8 26 [l cvcc
CKTTX l: 9 25 Cl VPOS
CTTX1 l: 10 24 Cl RSENSE
CTTX2 l: 11 23 [l GATE
12 13 14 15 16 17 18 19 20 21 22
I_l |_l |_l |_l |_l |_l g1 |_l |_l g1 |_l
i'i' E é g g 2 F3 3 1’5 , é D97TL279A
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
Vpos Positive Supply Voltage -O.4 to +17 V
A/BGND AGND to BGND -1 to +1 V
Vdig Pin D0, D1, D2, E, CKTTX -0.4 to 5.5 V
T] Max. junction Temperature 150 ''C
Vbto, (1) Vbtot=|Vpos|+|Vbat|. (Total voltage applied to the device 100 V
supply pins).
(1) Vbat is self generated by the on chip DC/DC converter and can be programmed via RF1 and RF2.
RF1 and RF2 shall be selected in order to fulfil the a.m limits (see External Components Table page 10)
