STLC3075_09 Datasheet, PDF (1/36 Pages) STMicroelectronics – Integrated POTS interface for home access gateway and WLL

STLC3075
Integrated POTS interface
for home access gateway and WLL
Features
■ Monochip SLIC optimized for WLL & VoIP
applications
■ Implements all Borsht function key features
■ Single supply (4.5 V to 12 V) for fly-back
configuration
■ Single supply (5.5 V to 12 V) for buck-boost
configuration
■ Built in DC/DC converter controller
■ Soft battery reversal with programmable
transition time
■ On-hook transmission
■ Programmable off-hook detector threshold
■ Metering pulse generation and filter
■ Integrated ringing
■ Integrated ring trip
■ Parallel control interface (3.3 V logic level)
■ Programmable constant current feed
■ Surface mount package
■ Integrated thermal protection
■ Dual gain value option
■ Automatic recognition flyback and buckboost
configuration
■ BCDIIIS 90V technology
■ -40 °C to +85 °C operating range
Description
The STLC3075 is a SLIC device specifically
designed for WLL (Wireless Local Loop), and
ISDN terminal adaptors and VoIP applications.
One distinctive characteristic of this device is its
ability to operate with a single supply voltage
(from +4.5 V to +12 V) and to self generate the
negative battery by means of an on-chip DC/DC
converter controller that drives an external MOS
switch.
LQFP44
The battery level is properly adjusted depending
on the operating mode. A useful characteristic for
these applications is the integrated ringing
generator.
The control interface is parallel with open drain
output and 3.3 V logic levels.
The metering pulses are generated on-chip
starting from two logic signals (0 and 3.3 V): one
signal defining the metering pulse frequency, the
other signal defining the metering pulse duration.
An on-chip circuit then provides the proper
shaping and filtering. Metering pulse amplitude
and shaping (rising and decay time) can be
programmed by external components.
A dedicated cancellation circuit avoids possible
codec input saturation due to metering pulse
echo.
Constant current feed can be set from 20 mA to
40 mA. Off-hook detection threshold is
programmable from 5 mA to 9 mA.
The device, which is developed in BCDIIIS
technology (90 V process), operates in the
extended temperature range and integrates a
thermal protection that sets the device in power
down when T_j exceeds 140 °C.
Table 1. Device summary
Order code
Package
E-STLC3075⁽¹⁾
LQFP44
1. ECOPACK® (see Section 9)
Packing
Tray
March 2009
Rev 8
1/36
www.st.com
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