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PBL386502QNT Datasheet(PDF) 1 Page - Ericsson |
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PBL386502QNT Datasheet(HTML) 1 Page - Ericsson |
1 / 16 page 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. The PBL 386 50/2 emulates resistive loop feed, programmable between 2x50 Ω and 2x900 Ω, 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 2x30k Ω. 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 386 50/2 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 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. The PBL 386 50/2 package options are 24-pin SSOP, 24-pin SOIC or 28-pin PLCC. Figure 1. Block diagram. June 1999 PBL 386 50/2 Subscriber Line Interface Circuit 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 <5 mA (RLeak ~ >10 k Ω @ -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 24-pin SOIC, 24-pin SSOP, 28-pin PLCC 1 RRLY C1 C2 C3 DET PSG REF LP PLD PLC VTX RSN PTG BGND AGND VBAT VBAT2 VCC HP RINGX TIPX DR DT Ring Relay Driver Input Decoder and Control Ring Trip Comparator Ground Key Detector Line Feed Controller and Longitudinal Signal Suppression Off-hook Detector VF Signal Transmission Two-wire Interface POV PBL 386 50/2 |
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