SI2494-A-GM

Overview

The SI2494-A-GM is a system-side network controller and processor IC from the Skyworks ISOmodem family, designed for V.92/V.34 compliant data communication over PSTN lines. It operates with a digital supply voltage ranging from 3.0 V to 3.6 V and supports data rates up to 56 kbps. The device features an integrated Direct Access Arrangement (DAA) providing over 6000 V capacitive isolation. It utilizes a QFN-38 package and supports UART, SPI, or parallel host interfaces. The G-grade variant ensures reliable operation across an industrial temperature range of -40 °C to +85 °C.

Feature Summary

• Integrated DAA technology eliminates external transformers, relays, opto-isolators, and hybrid circuits.
• Supports full-duplex voice pass-through with compression for answering machines and speakerphones.
• Firmware upgradeable via EEPROM interface without requiring external ROM or RAM.
• Compatible with Si3000 voice codec for hardware support of microphones, speakers, and handsets.

Applications

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

Procurement Notes

Verify that the specific ordering suffix matches the required commercial or industrial temperature grade. Confirm compatibility with the paired line-side device, typically the Si3018, as the datasheet validity depends on listed chipset combinations. Ensure the design accounts for the humidity sensitivity classification during storage and assembly processes.

Selection Notes

Select the SI2494-A-GM when an industrial temperature range (-40 °C to +85 °C) is required for embedded modem applications. This model provides global DAA compliance and supports V.92 PCM upstream capabilities. Verify that the host system can accommodate the available UART, SPI, or parallel interface options provided by this component.

Part Context

This component belongs to the Skyworks ISOmodem series, which integrates DSP, modem controller, codec, and DAA functions into a compact solution. The SI2494 serves as the system-side processor in a chipset architecture, working alongside the Si3018 line-side device to provide a complete modem solution with minimal external component count.

Replacement Considerations

The SI2494-A-FM is a verified alternative offering identical functionality within the commercial temperature range (0 °C to +70 °C). Substitution requires verification of thermal management requirements and adherence to the same chipset pairing guidelines with the Si3018.