SI32283-A-FMR

Telecom Overview

The Si32283-A-FMR is a dual Foreign Exchange Station (FXS) telephony interface IC from the Skyworks Si3228x ProSLIC family. It integrates two complete FXS channels within an 8 x 8 mm 56-pin QFN package. The device operates on a single 3.3 V supply and supports PCM digital interfaces with daisy-chain mode capability. Key functionalities include wideband audio processing, DTMF detection, and Smart Ringing technology to optimize power consumption. Built-in DC-DC converter controllers facilitate efficient battery voltage generation for line states.

Telecom Feature Summary

• Integrates two complete FXS channels performing all BORSCHT functions in a compact package
• Supports wideband voice quality with integrated DTMF detection capabilities
• Features Smart Ringing technology that reduces peak current requirements through adaptive ringing control
• Includes flexible integrated tracking DC-DC controller supporting low-cost capacitive boost configurations

Telecom Applications

• VoIP gateways and routers
• xDSL Integrated Access Devices (IADs)
• Analog Terminal Adapters (ATA)
• Private Branch Exchange (PBX) systems
• Wireless Local Loop (WLL) terminals

Telecom Procurement Notes

Verify the specific ordering suffix against official Skyworks documentation to confirm package type and temperature range. The 'R' suffix indicates tape and reel packaging. Ensure compatibility with host system PCM interface requirements and daisy-chain topology before procurement.

Telecom Selection Notes

Select this model when PCM interface with daisy-chain support and DTMF detection are required. Compare against the Si32281 variant if ISI interface is preferred instead of PCM. Verify thermal management needs for the 0 to 70 °C operating range and ensure the host processor supports the necessary digital signaling protocols.

Telecom Part Context

This component belongs to the Si3228x series of dual ProSLIC devices designed for high-density telephony applications. It serves as a direct replacement for legacy dual FXS solutions by consolidating functionality into a single chip. The device complements other members of the family such as the Si32282 and Si32284, differing primarily in interface type and feature set.

Telecom Replacement Considerations

The Si32282-A-FMR offers identical PCM interface and daisy-chain support but lacks DTMF detection. The Si32283-A-GM provides the same features with an extended industrial temperature range of -40 to 85 °C. Verify pinout and software compatibility when substituting these variants.