The Le792231 Dual Intelligent Subscriber Line Audio Processing Circuit (ISLAC?), in combination with VE790 Series SLIC? devices, implements two-channel universal telephone line interface. The Le792231 Dual ISLAC device has integrated self-test and line-test capabilities to resolve faults to the line or line circuit. The integrated test capabilities are crucial for remote applications where dedicated test hardware is not cost effective.

Features & Benefits

• High performance digital signal processor provides programmable control of all major line card functions
• A-law/?-law and linear codec/filter
• Transmit and receive gain
• Two-wire AC impedance
• Transhybrid balance
• Equalization
• DC loop feeding
• Smooth or abrupt polarity reversal
• Loop supervision
• Off-hook debounce circuit
• Ground-key and ring-trip filters
• Internal ringing generation and integrated ring-trip detection
• Adaptive hybrid balance
• Line and circuit testing
• Meets GR-909 and GR-844 test requirements
• Tone generation (DTMF, FSK, random noise, and arbitrary tone)
• Metering generation at 12 kHz and 16 kHz
• Envelope shaping and level control
• Modem Tone Detection
• Selectable PCM/MPI or GCI digital interfaces
• Supports most available master clock frequencies from 512 kHz to 8.192 MHz
• General purpose I/O pins
• +3.3 V DC operation
• Exceeds LSSGR and ITU requirements
• Supports external ringing with on-chip ring-trip circuit
• Automatic or manual ring-trip modes
• Supports Caller Number Identification (CID)

Documentation

• Le79223-datasheet.pdfPlease login to access protected documents.

Design Manuals

Software Manuals

Product Previews

• VE790 Series Product Preview

Software URLs

• LE71SK0002: VoicePath API-II Software
• LE71SDKWIN: WinSLAC
• LE71SDKVPS: VP-Script
• LE71SDKUVB: UVB Images
• LE71SDKPRO: Profile Wizard

Typical Applications

Enables a cost-effective voice solution for short-to-medium loop applications providing POTS and integrated test capabilities

• VoIP
• DLC
• IVD
• FTTP
• ONT
• PBX/KTS
• Pair gain

Product Packaging & Availability

Part Number	Package Type	Pin Count	Lead-Free Option	Shipping Option(s)	Lead Time(wks)	Status
LE792231DVC	TQFP	64	GREEN	Tray		Production
LE792231DVC	TQFP	64	GREEN	Tray		Production

Packaging Information

• Soldering Profiles
• Moisture Sensitivity
• Shelf Life
• Reliability Data

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