LE79Q2281
Intelligent Subscriber Line Audio Processing Circuit (SLAC) - Quad
Overview
We are transitioning to Microchip; this page will be directed to Le79Q2281 product page at www.microchip.com.
| The Le79Q2281 Quad Intelligent Subscriber Line Audio Processing Circuit (ISLAC), in combination with VE790 Series SLIC devices, implements four-channel universal telephone line interface. The Le79Q2281 Quad 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/µ-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
- A-law/µ-law and linear codec/filter
- 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 CallerNumber Identification (CID) tone generation
