Pro-X Single Programmable Extended CODEC/SLCC

The W681388 implements a single channel FXS telephone line interface optimized for short loop applications. It integrates SLCC (Subscriber Line Control Circuit) functionality with a programmable CODEC and a DC-to-DC controller. The SLCC supports internal ringing up to 90 VPK (5 REN at 4 kft) ideal for customer premise equipment (CPE). The CODEC can be configured for µ-law/A-law or 16-bit linear PCM encoding and supports a comprehensive set of signaling capabilities required to supervise and control both telephone lines. These include tone generation, including ring tones, DTMF generation and detection as well as FSK and metering pulse generation. An on-chip pulse width modulation (PWM) driver allows the control of DC-to-DC conversion for the line. Programmable impedance and transhybrid balancing allow for worldwide deployment.

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All packages available in Pb-free
 
 
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Block Diagram
Key Features
  • Performs complete BORSCHT functions for a single channel with a single device
  • Internal balanced ringing up to 90 VPK (5 REN up to 4 kft)
  • Integrated Power Management
    • Integrated DC-to-DC controller regulates battery voltage to minimize power dissipation in all operating modes
  • Programmable linefeed characteristics
    • Ringing frequency, amplitude, cadence
    • Trapezoidal and Sinusoidal waveforms
    • Two-wire AC impedance, transhybrid balance
    • Constant Current feed (20 to 41 mA)
    • Ring trip and loop closure threshold
  • Programmable signal generation
    • DTMF generation and detection
    • Metering pulse generation (12/16 kHz)
    • Enhanced Caller ID (FSK) generation (Type I and Type II)
    • Tone generation (up to four simultaneous)
    • G.711 µ-Law/A-Law / 16-bit linear PCM audio
    • Programmable audio path gains
  • Loop test and diagnostics support
    • Integrated loopback modes
    • Real-time linefeed monitoring
    • On-chip temperature sensor
    • PCM and SPI bus digital interfaces
    • PCM Master and Slave modes supported
  • On-chip PLL for flexible clocking options including 1.000 MHz and 2.000 MHz BCLK operation
  • 3.3V operation
  • Small Footprint Packages:LQFP-48, QFN-48
Benefits
Applications
  • High integration reduces overall system BOM and footprint
  • Low power consumption for battery-backup and other
    power sensitive applications
  • High programmability reduces real-time software overhead
  • Extensive line sensing enables diagnostics support
  • Analog Telephone Adapter
  • Voice enabled DSL Modems
  • Voice enabled Cable Modems
  • Residential VoIP Gateways / Routers
  • Integrated Access Devices
  • Fiber to the Premise/Home (FTTP/H)
  • Optical Network Terminals (ONT)
  • Set Top Boxes
  • Wireless Local Loop, PBX, ISDN NT1/TA

Application Diagram

Product Selection Guide
Part Number
Description
Package
W681388DG
Single channel FXS telephone line interface, µ-law/A-law or 16-bit linear PCM
LQFP-48 Pb-Free
W681388YG
Single channel FXS telephone line interface, µ-law/A-law or 16-bit linear PCM
QFN-48 Pb-Free