SI32291-A-FMR

Telecom Overview

The Skyworks SI32291-A-FMR is a single-chip dual Foreign Exchange Station (FXS) interface solution from the Si3229x ProSLIC family. It integrates two complete telephony channels within an 8 x 8 mm 68-pin QFN package, operating on a 3.3 V supply with a maximum battery voltage rating of -140 V. The device supports wideband audio and includes DTMF detection capabilities. Digital connectivity is provided via a 3-wire Integrated Serial Interface (ISI). Designed for commercial applications, it operates within a temperature range of 0 to 70 °C.

Telecom Feature Summary

• Performs all BORSCHT functions including battery feed, over-voltage protection, ringing supervision, codec processing, hybrid balancing, and test capabilities.
• Integrates two programmable DC-DC converter controllers that operate in battery tracking mode to optimize efficiency and minimize heat generation.
• Supports wideband audio transmission and reception compliant with PKT-SP-HDV-104-120823 standards.
• Includes built-in DSP for self-testing, metallic loop testing, and integrated test load functionality.

Telecom Applications

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

Telecom Procurement Notes

Verify the specific ordering suffix 'R' indicates tape and reel shipping configuration as defined in the official datasheet. Confirm the 'F' grade designation corresponds to the commercial temperature range of 0 to 70 °C. Ensure compatibility with the required 3-wire ISI digital interface protocol before procurement.

Telecom Selection Notes

Select this model when dual FXS channels are required with DTMF detection and ISI interface support. Compare against PCM interface variants if synchronous digital timing is preferred. Consider the industrial grade (-40 to 85 °C) variant if extended environmental tolerance is necessary for the deployment scenario.

Telecom Part Context

The SI32291-A-FMR belongs to the Si3229x series of ProSLIC devices, which provide integrated analog telephony interfaces. This series consolidates SLIC, codec, and signal generation functions into a single package to reduce system footprint and component count compared to discrete solutions.

Telecom Replacement Considerations

The Si32291-A-GM serves as the industrial temperature grade equivalent with identical functional specifications but expanded thermal operation limits. Other Si3229x models may require interface or feature adjustments due to differences in digital protocols or DTMF capabilities.