PBL386402

• 24-pin SSOP package
• High and low battery with automatic switching
• 65 mW on-hook power dissipation in active state
• On-hook transmission
• Long loop battery feed tracks Vbat for maximum line voltage
• Only +5 V feed in addition to battery
• Selectable transmit gain (1x or 0.5x)
• No power-up sequence
• Programmable signal headroom
• 43V open loop voltage @ -48V battery feed
• Constant loop voltage for line leakage <5 mA (RLeak ~ >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
• -40°C to +85°C ambient temperature range

The PBL 386 40/2 Subscriber Line Interface Circuit (SLIC) is a 90 V bipolar integrated circuit for use in Digital Loop Carrier, FITL and other telecommunications equipment. The PBL 386 40/2 has been optimized for low total line interface cost and a high degree of flexibility in different applications.

The PBL 386 40/2 emulates resistive loop feed, programmable between 2x50 and 2x900 , with short loop current limiting adjustable to max 45 mA. In the current limited region the loop feed is nearly constant current with a slight slope corresponding to 2x30 k.

A second, lower battery voltage of PBL386402 may be connected to the device to reduce short loop power dissipation. The SLIC automatically switches between the two battery supply voltages without need for external components or external control.

The SLIC incorporates loop current, ground key and ring trip detection functions.

The PBL 386 40/2 is compatible with both loop and ground start signaling.

Two- to four-wire and four- to two-wire voice frequency (VF) signal conversion is accomplished by the SLIC in conjunction with either a conventional CODEC/filter or with a programmable CODEC/filter, e.g. SLAC, SiCoFi, Combo II. The programmable of PBL386402 two-wire impedance, complex or real, is set by a simple external network.

Longitudinal voltages of PBL386402 are suppressed by a feedback loop in the SLIC and the  longitudinal balance specifications meet the DLC requirements.

The PBL 386 40/2 package options are 24-pin SSOP package, 24-pin SOIC and 28-pin PLCC.