SI32290-A-FMR

Telecom Overview

The Si32290-A-FMR is a dual Foreign Exchange Station (FXS) interface integrated circuit from Skyworks Solutions. It operates on a 3.3 V supply and supports a maximum battery voltage of -140 V. The device features an Integrated Serial Interface (ISI) for digital connectivity. It includes two built-in DC-DC converter controllers to optimize battery voltage efficiency. The component provides wideband audio capabilities, DTMF generation, and Smart Ringing functionality. It is housed in an 8 x 8 mm 68-pin QFN package with a commercial 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 synthesis, and test capabilities within a single package.
• Integrates two programmable DC-DC converter controllers that operate in battery tracking mode to automatically generate optimal line-state voltages.
• Supports wideband audio transmission and reception with expanded frequency response for enhanced voice quality compared to standard PSTN interfaces.
• Features Smart Ringing technology that reduces peak current requirements during ring generation, allowing the use of lower-cost AC-DC adapters.

Telecom Applications

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

Telecom Procurement Notes

Verify the specific ordering suffix 'R' indicates tape and reel packaging rather than tray. Confirm the 'F' grade corresponds to the commercial temperature range of 0 to 70 °C. Ensure the ISI interface requirement matches the host system design. Check for RoHS compliance status as indicated in the datasheet. Validate the maximum battery voltage rating against the power supply design.

Telecom Selection Notes

Select this model when dual FXS channels are required with an ISI digital interface. Choose this part if the application demands wideband audio support and integrated DC-DC control. Consider the 8x8 mm QFN package constraints for PCB layout. Verify compatibility with the host processor's ISI timing specifications. Ensure the thermal management strategy accommodates the junction temperature limits.

Telecom Part Context

This component belongs to the Si3229x series of ProSLIC devices. The series offers various configurations including PCM interfaces and different feature sets like DTMF detection. The Si32290 variant specifically focuses on ISI connectivity without DTMF detection hardware. Other members in the family include models with PCM interfaces or industrial temperature grades.

Telecom Replacement Considerations

Si32290-A-GM: Industrial temperature grade version (-40 to 85 °C). Si32290-A-FM: Tray packaged version of the same electrical specification.