FlexiSLIC, Telecom IC, 90V bipolar, 24-Pin DSO

The PBL 38620/2 Subscriber Line Interface Circuit (SLIC) is a 90 V bipolar integrated circuit for use in PBX, Terminal adapters and other telecommunications equipment. The PBL 38620/2 SLIC has been optimized for low total line interface cost and for a high degree of flexibility in different applicationsThe PBL 38620/2 SLIC has constant current feed, programmable to maximum 30 mA. A second lower battery voltage 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 38620/2 is compatible with loop start signalling.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, for example SiCoFi PEB 2466. The programmable two-wire impedance, complex or real, is set by a simple external network. Longitudinal voltages are suppressed by a feedback loop in the SLIC and the longitudinal balance specifications meet Bellcore TR909 requirements.

• 24-pin SSOP package
• High and low battery with automatic switching
• 60 mW on-hook power dissipation in active state
• On-hook transmission
• Long loop battery feed tracks Vbat for maximum line voltage
• Selectable transmit gain (1x or 0.5x)
• No power-up sequence
• 44 V open loop voltage @ -48 V battery feed
• Close tolerance current feeding
• Full longitudinal current capability during on-hook state
• Analog overtemperature protection permits transmis-sion while the protection circuits is active
• Integrated Ring Relay driver
• Ground key detector
• Programmable signal headroom