Microchip LE58QL031DJC

Концепция интерфейса абонентской линии (SLIC)PCM3.3V

Overview

The Le58QL02/021/031 Quad Low Voltage Subscriber Line Audio-Processing Circuit (QLSLAC™) devices integrate the key functions of analog line cards into high-performance, veryprogrammable, four-channel codec-filter devices. The QLSLAC devices are based on the proven design of Legerity’s reliable SLAC™ device families. The advanced architecture of the QLSLAC devices implements four independent channels and employs digital filters to allow software control of transmission, thus providing a cost-effective solution for the audio-processing function of programmable line cards. The QLSLAC devices are software and coefficient compatible to the QSLAC devices.

FEATURES „ Low-power, 3.3 V CMOS technology with 5-V tolerant digital inputs „ Software and coefficient compatible to the Le79Q02/021/031 QSLAC™ device „ Performs the functions of four codec/filters „ Software programmable:   — SLIC device input impedance   — Transhybrid balance   — Transmit and receive gains   — Equalization (frequency response)   — Digital I/O pins   — Programmable debouncing on one input   — Time slot assigner   — Programmable clock slot and PCM transmit clock edge options „ Standard microprocessor interface „ A-law, µ-law, or linear coding „ Single or Dual PCM ports available   — Up to 128 channels (PCLK at 8.192 MHz) per PCM port   — Optional supervision on the PCM highway „ 1.536, 1.544, 2.048, 3.072, 3.088, 4.096, 6.144, 6.176, or 8.192 MHz master clock derived from MCLK or PCLK „ Built-in test modes with loopback, tone generation,and µP access to PCM data „ Mixed state (analog and digital) impedance scaling „ Performance guaranteed over a 12 dB gain range „ Real Time Data register with interrupt (open drain or TTL output) „ Supports multiplexed SLIC device outputs „ Broadcast state „ 256 kHz or 293 kHz chopper clock for Legerity SLIC devices with switching regulator „ Maximum channel bandwidth for V.90 modems APPLICATIONS „ Codec function on telephone switch line cards

Features

Applications

• T1/E1/J1 add/drop multiplexers (MUX)
• Channel Service Units (CSUs): T1/E1/J1
• Fractional T1/E1/J1
• BITS Timing
• Digital Access Cross-connect System (DACs)
• Digital Cross-connect Systems (DCS)
• Frame Relay Switches and Access Devices (FRADS)
• ISDN Primary Rate Interfaces (PRA)
• PBXs channel bank
• PCM channel bank