SI2494-A-GMR

Overview

The Skyworks SI2494-A-GMR is a system-side ISOmodem network controller processor IC designed for embedded applications. It operates at a data rate of 56 kbps and supports V.92/V.34 protocols over the PSTN. The device functions with a digital supply voltage (VD) ranging from 3.0 V to 3.6 V, typically 3.3 V, with a maximum total supply current of 17 mA. It interfaces via UART, SPI, or parallel connections and utilizes a QFN-38 package measuring 5 x 7 mm. The G-grade variant supports an operating temperature range of -40 °C to +85 °C.

Feature Summary

• Integrates DSP data pump, modem controller, codec, and direct access arrangement (DAA) into a single chipset solution.
• Supports global telephone line compliance with programmable interface and overcurrent detection capabilities.
• Enables voice pass-through, full-duplex speakerphone support, and DTMF generation/detection.
• Offers flexible clocking options including low-cost oscillators and external clock inputs.

Applications

• Point-of-sale terminals
• Security systems
• Medical equipment
• Remote monitoring devices

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm the exact grade and packaging configuration. Confirm that the required Si3018 line-side companion device is included in the design plan, as the SI2494-A-GMR functions as part of a paired chipset architecture for complete modem functionality.

Selection Notes

Select the SI2494-A-GMR when industrial temperature operation (-40 °C to +85 °C) is required. Ensure the host system supports the necessary UART, SPI, or parallel interface protocols. Verify that the application benefits from the integrated DAA technology to reduce the bill of materials by eliminating separate transformers and opto-isolators.

Part Context

The SI2494-A-GMR belongs to the Skyworks ISOmodem family, specifically the Si2494/39 series. It serves as the system-side component of a two-chipset modem solution, working in conjunction with the Si3018 line-side device to provide a complete V.92/V.34 compliant modem implementation for telecommunications applications.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should consult the manufacturer's latest datasheet for any discontinued variants or recommended upgrades within the Si2494 product line.

FAQ

Does the SI2494-A-GMR require external ROM or RAM?

No, the device features on-chip RAM and ROM, eliminating the need for external memory components.

What voice standards does the SI2494-A-GMR support?

It supports TBR-38, TIA/EIA-4790, and other voice standards through its interface with the optional Si3000 voice codec.

Can the firmware of the SI2494-A-GMR be upgraded?

Yes, the device supports firmware upgrades via its EEPROM interface.