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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 ?-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.
For additional technical documentation, please Contact Sales.
All packages available in Pb-free
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Key Features
Benefits/Applic
Application Dia
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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
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
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Application Diagram
Product Selection Guide
Part Number Description Packa
g
W681388DG Single channel FXS telephone line interface, µ-law/A-law or 16-bit linear PCM LQFP-48
P
W681388YG Single channel FXS telephone line interface, µ-law/A-law or 16-bit linear PCM QFN-48 P
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