Single Programmable Extended CODEC/SLIC

The W681388 implements a single channel FXS telephone line interface optimized for short loop applications. It integrates SLIC (Subscriber Line Interface Circuit) functionality with a programmable CODEC and a DC-to-DC controller.

FEATURES

• Performs complete BORSCHT functions for a single channel with a single device

• Internal balanced ringing up to 90VPK (5REN up to 4kft)

• Integrated Power Management

▫ Integrated DC-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 41mA)

▫ Ring trip and loop closure thresholds

• Programmable signal generation

▫ DTMF generation and detection

▫ Metering pulse generation (12/16kHz)

▫ 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

• Loop test and diagnostics support

▫ Integrated loopback modes

▫ Realtime 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 1MHz / 2MHz

• 3.3V operation

• Small Footprint Packages: LQFP-48, QFN-48

APPLICATIONS

• 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