E-STLC3055N View Datasheet(PDF) - STMicroelectronics

Part Name

Description

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E-STLC3055N

WLL and ISDN-TA subscriber line interface circuit

STMicroelectronics 

STLC3055N

WLL and ISDN-TA subscriber line interface circuit

Features

■ Monochip subscriber line interface circuit

(SLIC) optimised for WLL and VoIP

applications

■ Implement all key features of the BORSHT

function

■ Single supply (5.5 V to 12 V)

■ 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

■ BCD III S, 90 V technology

■ -40 to +85 °C operating range

Description

The STLC3055N is a SLIC device specifically

designed for wireless local loop (WLL) and ISDN-

terminal adaptors (ISDN-TA) and VoIP

applications. One of the distinctive characteristic

of this device is the ability to operate with a single

supply voltage (from 5.5 V to 12 V) and self

LQFP44

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

these applications is the integrated ringing

generator.

The control interface is a parallel type 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

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 20 mA to

40 mA. Off-hook detection threshold is

programmable from 5 mA to 9 mA.

The device, developed in BCD III S technology

(90 V process), operates in the extended

temperature range and integrates a thermal

protection that sets the device in power down

when Tj exceeds 140 °C.

Table 1. Device summary

Order code

E-STLC3055N (1)

1. ECOPACK® (see Section 10)

Package

LQFP44

Packing

Tray

February 2009

Rev 11

1/34

www.st.com

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