描述 Description

The PBL 386 50/2 Subscriber Line Interface Circuit (SLIC) is a 90 V bipolar integrated circuit for use in Central Office Metering applications and other telecommunications equipment. The PBL 386 50/2 has been optimized for low total line interface cost and a high degree of flexibility in different applications.

Key Features

? 24-pin SSOP package

? Programmable two-wire signal headroom for 2.2 V rms metering

? High and low battery with automatic switching

? Only +5 V feed in addition to battery

? Selectable transmit gain (0.5x or 0.25x)

? 70 mW on-hook power dissipation in active state

? On-hook transmission

? Long loop battery feed tracks Vbat for maximum line voltage

? No power-up sequence

? 43V open loop voltage @ -48V battery feed

? Constant loop voltage for line leakage 10 k? @ -48V)

? Full longitudinal current capability during on-hook state

? Analog over temperature protection permits transmission while the protection circuit is active

? Line voltage measurement

? Polarity reversal

? Ground key detector

? Tip open state with ring ground detector