Skyworks Solutions Inc. SI3018-F-GSR

Overview

SI3018-F-GSR from Skyworks Solutions is a globally certified Direct Access Arrangement (DAA) IC for telephone line interface, integrating programmable AC/DC termination, 80 dB dynamic range TX/RX paths, integrated codec and 2-to-4-wire hybrid, ring detection, and >5000 V isolation. It replaces analog front ends, isolation transformers, relays, and opto-isolators in V.92 modems and fax machines.

For engineers reviewing the SI3018-F-GSR datasheet, SI3018-F-GSR pinout, SI3018-F-GSR application, or SI3018-F-GSR equivalent, key selection criteria include global regulatory compliance support (ITU-T V.5, V.22bis, V.32, V.34, V.90, V.92), programmable line interface configuration, isolation barrier integrity, caller ID timing accuracy, and serial interface timing compatibility with modem DSPs.

Technical Context

The SI3018-F-GSR implements a fully integrated DAA architecture with proprietary isolation technology, eliminating external transformers and discrete protection components. Its digital interface supports master/slave mode with FSYNC/SCLK/SDI/SDO signaling and up to eight-device daisy-chaining via FC/RGDT control.

It features dual-path programmable DC termination (MINI/ILIM/DCV registers), adaptive AC termination, transhybrid balance tuning, and configurable FIR/IIR filtering (3.3 kHz passband, –74 dB stopband attenuation). Ring detection operates at 13–68 Hz with voltage thresholds of 13.5–23.65 V_RMS, validated per ITU-T O.41 and ANSI T1.413.

Key Specifications

Pinout & Package

SI3018-F-GSR is housed in a 16-pin SOIC package (300 mil width, RoHS-compliant, lead-free) with exposed pad thermal enhancement. Pin functions are defined per Skyworks Rev. 1.06 datasheet Section 8 ("Pin Descriptions: Si3018/19/10").

Key Features

Applications

Equivalent & Alternatives

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

Compared with SI3018-F-GSR, Si3019-F-GSR offers higher output drive and wider temperature tolerance but shares identical pinout and firmware interface; SLIC3710-IM reduces component count for voice-only use but requires external CID decoding and fails to meet full V.92 modem certification requirements.

Availability

SI3018-F-GSR is available at Aetrix Electronics and suitable for V.92 modems, fax machines, multi-function printers, and set-top boxes requiring stable component supply, long-term lifecycle support, and global regulatory compliance assurance.

Supply support for SI3018-F-GSR 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 SI3018-F-GSR belongs to Skyworks' Direct Access Arrangement product line, engineered specifically to replace legacy transformer-based telephone line interfaces with fully integrated, digitally programmable, and globally certified alternatives.

FAQ

What is the primary function of the SI3018-F-GSR in a modem design?

The SI3018-F-GSR serves as a complete Direct Access Arrangement (DAA), replacing analog front ends, isolation transformers, relays, and opto-isolators. In modem designs, it handles line-side interface duties including AC/DC termination, ring detection, hybrid balancing, echo cancellation, and PCM audio conversion-enabling direct connection to PSTN lines while meeting global regulatory standards such as ITU-T V.92 and FCC Part 68. The SI3018-F-GSR integrates all these functions on a single chip.

Does the SI3018-F-GSR support both Type I and Type II caller ID formats?

Yes, the SI3018-F-GSR natively supports both Type I and Type II caller ID protocols per ETSI EN 300 659 and ANSI T1.413. It includes dedicated hardware for FSK demodulation, timing recovery, and data framing, delivering 50 dB dynamic range in CID mode with 6 V_PEAK full-scale input sensitivity. This capability is confirmed in Skyworks Rev. 1.06 datasheet Section 5.21 and Table 4 (DRCID and VCID specifications).

What isolation rating does the SI3018-F-GSR provide, and which safety standards does it meet?

The SI3018-F-GSR provides >5000 V isolation using Skyworks' proprietary capacitive isolation technology, certified to UL1950 3rd Edition and compliant with IEC 60950-1. This eliminates the need for external isolation transformers while maintaining reinforced insulation barriers between line-side and logic-side circuits. The isolation specification is explicitly stated in the "Features" section of the datasheet and verified in Appendix-UL1950 3rd Edition (page 90).

Can the SI3018-F-GSR operate with a 3.3 V supply only, or does it require additional voltage rails?

The SI3018-F-GSR operates from a single 3.3 V supply (VD = 3.0–3.6 V) for its digital core and serial interface. An internal charge pump generates VA (analog supply) for line-side circuitry, eliminating the need for external high-voltage rails. All digital I/O pins (MCLK, SCLK, FSYNC, SDI, SDO, RESET, M0, OFHK, RGDT/FSD/M1) are 3.3 V compatible, as confirmed in Table 3 ("DC Characteristics") and Section 5.3 ("Power Supplies").

How many devices can be controlled on a single serial bus using the SI3018-F-GSR's FC/RGDT pin?

The SI3018-F-GSR supports daisy-chained configurations of up to eight devices on a single serial bus using the FC/RGDT pin for frame control and device addressing. This is enabled via master/slave mode selection (DCE bit) and FSD signaling, as detailed in Section 5.27 ("Multiple Device Support") and Tables 7–10 (serial interface timing). Each device responds to unique address bits written during initialization, allowing coordinated control without additional GPIO overhead.