LE88221
Description
Legerity's dual-channel Le88221/241 Automatic Battery Switching (ABS) VoicePort™ device implements a dualchannel telephone line interface by providing all the necessary voice interface functions from the high voltage subscriber line to the µP/DSP digital interface. The ABS device can operate from external battery supplies, or from supplies generated by the on chip switching regulator controllers.
Key Features
- Complete BORSCHT function in a single VoicePortTM device for two channels - Battery Feed, Over-voltage support, integrated Ringing, line Supervision, Codec, Hybrid (2W/4W), Test - Small footprint package - Exposed pad 80-pin LQFP - Minimal external discrete components required Integrated Power Management - Integrated high voltage switching regulator controllers - Wide input voltage range (VSW =+3.3V to +35 V) - Generates supplies for VBH, VBM & VBL - Low power Idle and On-hook transmission states Ringing - 5 REN with pin for pin compatible 100-V (Le88221) and 120-V (Le88241) devices - Up to 110-Vpk internal balanced sinusoidal or trapezoidal ringing with programmable DC offset - Unbalanced ringing for PBX trunk compatibility (Le88241 device) Pin selectable PCM/MPI or GCI interface Worldwide Programmability - Two-wire AC impedance, Balance Impedance, Gain - DC feed voltage and current limit - Ringing frequency, voltage and current limit - 12 kHz and 16 kHz Metering - Programmable loop closure and ring trip thresholds G.711 µ-law, A-law, or 16 bit linear coding Powerful signal generator - Universal Caller ID generation - Up to 4 simultaneous tones - Automatic cadencing feature Subscriber Loop Test/Self Test support - Comprehensive line sensing - Integrated self test capabilities - Line fault detection and reporting - Loop supervision, AC/DC faults - Test load switch (Le88241) Integrated 150 mW 3-V or 5-V Relay Driver Pin-compatible wide band version available (16-kHz sampling mode) * * *
- VOICEPORT™ DEVICE BLOCK DIAGRAM
