SI32280-A-GMR

Telecom Overview

The Si32280-A-GMR is a dual Foreign Exchange Station (FXS) telephony interface IC from the Skyworks Si3228x series. It integrates two complete FXS channels within an 8 x 8 mm 48-pin QFN package. The device operates on a single 3.3 V supply and supports standard PCM/SPI or 3-wire ISI digital interfaces. It features built-in DC-DC converter controllers for optimized battery voltage generation, wideband audio support, and DTMF tone generation. The component handles all BORSCHT functions and includes programmable parameters for loop feed current, impedance, and ringing characteristics.

Telecom Feature Summary

• Integrates two complete FXS channels in a compact package to perform all BORSCHT functions
• Supports flexible integrated tracking DC-DC controller with capacitive boost configuration
• Provides wideband voice quality with DTMF generation and adaptive ringing capabilities
• Includes software-programmable parameters for AC impedance, transhybrid balance, and pulse metering

Telecom Applications

• VoIP gateways and routers
• Analog Terminal Adapters (ATA)
• Private Branch Exchange (PBX)
• Wireless Local Loop (WLL)

Telecom Procurement Notes

Verify the specific ordering suffix against official Skyworks documentation to confirm the exact package type and temperature range. Confirm that the GMR suffix indicates tape and reel packaging as per the manufacturer's guide. Ensure compatibility with the required digital interface standards before procurement.

Telecom Selection Notes

Select this model when a dual-channel FXS solution with an ISI interface is required. Compare against other Si3228x variants if DTMF detection or Smart Ringing features are needed, as this specific part focuses on basic dual FXS functionality. Verify that the 0 to 70 °C commercial temperature range meets the application requirements.

Telecom Part Context

This component belongs to the Si3228x family of Dual ProSLIC devices designed for cost-effective telephony integration. It serves as a single-chip solution for implementing foreign exchange station lines, replacing multiple discrete components. The device simplifies design by integrating line diagnostics, codecs, and power management into one package.

Telecom Replacement Considerations

Si32280-A-FM: Commercial temperature version in tray packaging. Si32280-A-GM: Extended temperature version (-40 to 85 °C). Si32281-A-GMR: Variant including DTMF detection capability.