Skyworks Solutions Inc. SI3011-F-FMR

Overview

SI3011-F-FMR from Skyworks Solutions is a line-side voice Data Access Arrangement (DAA) IC for FXO analog telephony interfaces, implementing patented capacitive isolation (≥5000 V), programmable AC/DC termination, and integrated ring detection. It delivers 80 dB dynamic range, +3.2 dBm TX/RX full-scale level, and supports pulse dialing, caller ID (Type I/II), and ground/loop start in VoIP gateways requiring transformerless, globally compliant telephony interface.

For engineers reviewing the SI3011-F-FMR datasheet, SI3011-F-FMR pinout, SI3011-F-FMR application, or SI3011-F-FMR equivalent, this device is selected for its certified surge immunity, low on-hook leakage (≤5 µA), configurable loop current (10–120 mA), and compatibility with Si3050 system-side controller in PCM/GCI-based voice gateway designs.

Technical Context

The SI3011-F-FMR operates as the line-side companion to the Si3050 system-side controller in a two-chip DAA architecture, interfacing directly to TIP/RING telephone lines while providing galvanic isolation via Skyworks' proprietary capacitive barrier-eliminating transformers and relays. It implements fully programmable DC termination (adjustable voltage up to 40 V), AC termination, and digital hybrid control for echo reduction.

It supports dual serial interfaces: SPI for configuration and GCI/PCM highway for real-time audio data transfer at 8 kHz or 16 kHz sampling. Internal monitoring includes line voltage, loop current, ring detect (13.5–49.5 Vrms threshold), polarity reversal, and overload detection-all accessible via register reads and interrupt signaling.

Key Specifications

Pinout & Package

SI3011-F-FMR is housed in a 16-pin TSSOP package (3.0 × 4.4 mm, 0.65 mm pitch), RoHS-compliant and lead-free.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voice DAA applications.

Compared with SI3011-F-FMR, Si3018-F-FMR offers identical functionality with extended temperature rating, while SLIC120D-IM trades programmability and scalability for monolithic integration-making SI3011-F-FMR optimal for multi-line, globally certified, and firmware-flexible voice gateway architectures.

Availability

SI3011-F-FMR is available at Aetrix Electronics and suitable for VoIP gateways, IP-PBX systems, and voice mail platforms requiring stable component supply, long-lifecycle support, and certified telephony interface performance.

Supply support for SI3011-F-FMR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Skyworks Solutions is a global semiconductor company specializing in analog and mixed-signal connectivity solutions for wireless, broadband, automotive, and industrial markets.

The SI3011-F-FMR belongs to Skyworks' Voice DAA chipset family, designed specifically to replace legacy transformer-based FXO interfaces with programmable, isolated, and globally compliant analog telephony solutions.

FAQ

What is the primary function of the SI3011-F-FMR in a voice gateway system?

The SI3011-F-FMR serves as the line-side Data Access Arrangement (DAA) IC in a two-chip voice interface solution with the Si3050 system-side controller. Its core function is to safely and accurately connect to PSTN telephone lines (TIP/RING), provide galvanic isolation via capacitive barrier, supervise loop current and voltage, detect ring signals, and condition analog voice signals for digitization-enabling transformerless, globally certified FXO operation in the SI3011-F-FMR-based design.

Does the SI3011-F-FMR require an external transformer for isolation?

No, the SI3011-F-FMR does not require an external transformer. It implements Skyworks' patented capacitive isolation technology, delivering ≥5000 V RMS isolation between the line side and system side. This eliminates the need for bulky, costly, and performance-limiting isolation transformers, relays, or optocouplers-while maintaining full compliance with ITU-T K.20/K.21 and EN 61000-4-5 surge immunity standards in the SI3011-F-FMR implementation.

How does the SI3011-F-FMR support global telephony standards?

The SI3011-F-FMR supports global telephony standards through programmable parameters including multiple ring detect voltage thresholds (13.5–49.5 Vrms), selectable ringer equivalence number (REN), configurable DC termination (up to 40 V), and dual-mode caller ID (Type I and II). These features allow a single hardware design using the SI3011-F-FMR to meet regional requirements across North America, Europe, Asia, and Latin America without component changes.

Can multiple SI3011-F-FMR devices be controlled by a single Si3050?

Yes, up to 16 SI3011-F-FMR devices can be daisy-chained and controlled by a single Si3050 controller via a shared SPI bus. Each SI3011-F-FMR uses individual chip-select signaling and supports unique address mapping, enabling scalable multi-line voice gateway designs-such as 16-port IP-PBX systems-without increasing controller complexity or requiring additional SPI peripherals in the SI3011-F-FMR-based architecture.

What power supply requirements does the SI3011-F-FMR have?

The SI3011-F-FMR operates from a single 3.3 V ±10% digital supply (VD = 3.0–3.6 V), drawing 8.5–10 mA typical active current and as low as 1.3–1.5 mA in deep sleep mode. It requires no separate analog or isolated supplies-the capacitive isolation barrier handles voltage translation, and all line-side biasing is internally generated, simplifying power design in SI3011-F-FMR-based systems.