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PBL386302SHT Datasheet(PDF) 1 Page - Ericsson |
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PBL386302SHT Datasheet(HTML) 1 Page - Ericsson |
1 / 16 page Description The PBL 386 30/2 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 30/2 has been optimized for low total line interface cost and a high degree of flexibility in different applications. The PBL 386 30/2 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 and ring trip detection functions. The PBL 386 30/2 is compatible with loop 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 impendance, 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 the DLC requirements. The PBL 386 30/2 package options are 24-pin SSOP, 24-pin SOIC and 28-pin PLCC. Figure 1. Block diagram. March 2000 PBL 386 30/2 Subscriber Line Interface Circuit Key Features • 24-pin SSOP package • High and low battery supply 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 Ω @ -48V) • Full longitudinal current capability during on-hook state • Analog over temperature protection permits transmission while the protection circuit is active • Integrated Ring Relay Driver • -40 °C to +85°C ambient temperature range 24-pin SOIC, 24-pin SSOP, 28-pin PLCC 1 RRLY C1 C2 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 Line Feed Controller and Longitudinal Signal Suppression Off-hook Detector VF Signal Transmission Two-wire Interface POV PBL 386 30/2 |
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