SI3015-F-FS

Overview

The Si3015-F-FS is a Direct Access Arrangement (DAA) component within the Silicon Laboratories Si2400 ISOmodem chipset. It provides a globally compliant, programmable line interface to telephone networks using proprietary capacitive isolation technology. The device integrates analog front-end functions including hybrid circuits, DC termination, and ringer detection. It operates with a digital supply voltage ranging from 3.0 V to 5.25 V and supports loop currents up to 120 mA in FCC/Japan modes or 60 mA in CTR21 mode. The chip features overcurrent detection, parallel phone detection, and ring detect voltages between 11 V and 33 V RMS.

Feature Summary

• Integrates a fully programmable line interface capable of meeting global PTT specifications for AC/DC termination and ringer impedance.
• Utilizes proprietary silicon-based capacitive isolation technology to eliminate the need for external isolation transformers.
• Includes built-in hardware for monitoring line status, specifically supporting parallel handset detection and overcurrent condition alerts.

Applications

• Embedded modem applications requiring compact board space
• Set top boxes and power meters
• Security systems and ATM terminals
• Medical monitoring devices

Procurement Notes

Verify that the specific ordering suffix matches the required package type and temperature grade. Confirm compatibility with the host microcontroller's UART settings and logic levels. Ensure the design includes necessary discrete components for lightning surge protection and conducted disturbance compliance as detailed in the typical application schematic.

Selection Notes

Select this component when a complete modem solution is needed without separate DSP or AFE chips. Consider the operating temperature range (K-Grade vs B-Grade) based on the deployment environment. Verify that the system can support the required crystal frequency and that the host processor can handle the AT command set and data rates up to 2400 bps.

Part Context

This component is part of the Si2400 ISOmodem family, designed to replace traditional multi-chip modem architectures. It pairs with the Si2400 controller to form a complete hardware modem solution. The integration reduces bill-of-materials count by combining the DAA, hybrid, and codec functions into a single package alongside the controller.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.