STLC3055

The STLC3055 is a SLIC device specifically designed for WLL (Wireless Local Loop) and ISDNTerminal Adaptors. One of the distinctive characteristic 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 externalMOS switch.

The battery level is properly adjusted depending on the operating mode. A useful characteristic forthese applications is the integrated ringing generator.

The control interface is a parallel type with open drain output and 3.3V logic levels.

The metering pulses are generated on chip starting from two logic signals (0, 3.3V) one define the metering pulse frequency and the other 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 avoid possible CODEC input saturation due to Metering pulse echo.

Constant current feed can be set from 20mA to 40mA. Off-hook detection threshold is programmable from 5mA to 9mA.

The device, developed in BCD100II technology (100V process), operates in the extended temperature range and integrates a thermal protection that sets the device in power down when Tj exceeds 140°C.