Wideband dual FXS with PCM interface

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The Si3228x Dual ProSLIC® devices, in a single package, implement two complete foreign exchange station (FXS) telephony interfaces. The Si3228x devices operate from a 3.3 V supply and have standard PCM/SPI or 3-wire ISI digital interfaces. A pair of built-in dc-dc converter controllers can be used to automatically generate the optimal battery voltage required for each line-state, optimizing efficiency and minimizing heat generation. The Si3228x devices are designed to operate with capacitive boost tracking battery supply for lower power, cost, and footprint vs. other tracking or shared battery supplies in the industry. Self-testing and metallic loop testing (MLT) is facilitated by the built-in DSP, monitor ADC, and test load. The devices are available with wideband audio for better than PSTN voice quality, DTMF detection, and Smart Ringing. Smart Ringing reduces the peak current with 2-channel ringing for lower-cost ac-dc adapters. The Si3228x devices are available in a 7 x 7 mm 48-pin QFN or 8 x 8 mm 56-pin QFN package.

• VoIP gateways and routers
• Optical Network Terminals/Units (ONT/U)
• Analog Terminal Adapters (ATA)
• Cable eMTA
• Wireless Fixed Terminals (WFT)
• Wireless Local Loop (WLL)
• Private Branch Exchange (PBX)
• VoIP MDU gateways

Symmetry Electronics is an authorized Silicon Labs distributor.


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Two complete FXS channels in a single 7x7 or 8x8 mm package
Performs all BORSCHT functions
Ideal for short- or medium-loop applications
Ultra-low power consumption
Patented low-power ringing
Patent-pending Smart Ringing
Reduces peak current with 2-channel ringing
Adaptive ringing
Simplified configuration and diagnostics
Supported by ProSLIC API
Audio diagnostics with loopback
Integrated test load
Wideband voice support
On-hook transmission
Loop or ground start operation
Smooth polarity reversal
Programmable interrupts
Software-programmable parameters:
Ringing frequency, amplitude, cadence, and waveshape
Two-wire ac impedance
Transhybrid balance
DC current loop feed (1045 mA)
Loop closure and ring trip thresholds
Ground key detect threshold
Flexible integrated tracking DC-DC controller supporting patent-pending lowcost capacitive boost configuration
DTMF Generation
DTMF Detection (Si32281/3/5/7)
3-wire Integrated Serial Interface (ISI) or PCM interface
A-Law/-Law companding, linear PCM
Pulse metering
3.3 V operation
Pb-free/RoHS-compliant packaging


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