LE88221
Dual Channel FXS 100V ABS VoicePort™
Not recommended for new FXS designs.
Use miSLIC Series or ZL880 - Enhanced Dual Channel Wideband FXS Line Interfaces instead.
Overview
We are transitioning to Microchip; this page will be directed to Le88221 product page at www.microchip.com.
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The Le88221 Tracking Battery ABS (Automatic Battery Switching) VoicePort device implements a dual-channel 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. This device reduces system level cost, space, and power by achieving the highest level of voice integration possible. Designers benefit by having a simple, cost effective, low power and dense, interface design without sacrificing features or functionality. The programmable, feature rich VoicePort devices provide a highly functional line interface which meets the requirements of short and medium loop (up to 1500 Ohms total at 1 REN) applications. Features include: high voltage switching regulator, integrated ringing (up to 110-Vpk), worldwide software programmability, flexible signal generator with tone cadencing, caller ID generation and all BORSCHT functions. These VoicePort device features are crucial for designing cost-effective, full-featured Voice over Broadband solutions. |
Detailed Block Diagram
Features & Benefits
- Complete BORSCHT function in a single VoicePort device for two channels
- Battery Feed, Over-voltage support, integrated Ringing, line Supervision, Codec, Hybrid (2W/4W), Test
- 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
- Integrated high voltage switching regulator controllers
- 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
- 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 only)
- 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)
- Pin selectable PCM/MPI or GCI interface
- G.711 µ-law, A-law, or 16 bit linear coding
- Integrated 150 mW 3-V or 5-V Relay Driver
- Supports lifeline POTS in DSL IAD applications
- Small footprint package - Exposed pad 80-pin LQFP
- Minimal external discrete components required
