Skyworks Solutions Inc. SI5350A-B04225-GTR

Overview

SI5350A-B04225-GTR from Skyworks Solutions is a factory-programmed, pin-controlled CMOS clock generator with 3 outputs in 10-MSOP package, generating exact frequencies from 2.5 kHz to 200 MHz (0 ppm error) using a 25 MHz crystal reference. It delivers <70 ps pk-pk period jitter, supports spread spectrum on any output, and operates with independent core (1.8/2.5/3.3 V) and output (1.8/2.5/3.3 V) supplies - deployed in HDMI audio/video timing and residential gateway clock distribution.

For engineers reviewing the SI5350A-B04225-GTR datasheet, SI5350A-B04225-GTR pinout, SI5350A-B04225-GTR application, or SI5350A-B04225-GTR equivalent, key selection considerations include its fixed 3-output MSOP configuration, factory-programmed frequency plan, pin-based control (FS_0/1, SSEN, PDN, OEB), HCSL-compatible swing capability at 2.5 V VDDO, and absence of I²C interface.

Technical Context

The SI5350A-B04225-GTR implements a dual-PLL + per-output fractional MultiSynth™ architecture enabling simultaneous synthesis of three non-integer-related frequencies up to 200 MHz. Its PLLA-derived outputs support selectable spread spectrum (±0.1–±1.5% center-spread or –0.1––2.5% down-spread at 30–33 kHz modulation rate), while PLLB-synchronized outputs do not support spread spectrum.

It uses a fixed 25 MHz crystal (XA/XB) as sole frequency reference - no external CLKIN or voltage-controlled input - and supports static phase offset, rise/fall time control, and glitchless frequency switching via FS_0/FS_1 pins on CLK0/CLK1/CLK2. Output state (high/low/high-Z) when disabled is user-configurable per output.

Key Specifications

Pinout & Package

SI5350A-B04225-GTR is housed in a 10-pin MSOP package (3.0 × 4.9 mm body, 0.5 mm lead pitch) with exposed thermal pad (not electrically connected). The package supports standard reflow profiles (JEDEC J-STD-020, peak 260 °C for 20–40 sec) and achieves θJA = 150 °C/W on 2-layer board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5351A-B-GT, SI5350A-B04225-GTR delivers lower jitter and zero-host-configuration boot, while Si5350A-B04224-GT offers identical form-factor and performance but targets alternate frequency combinations - making SI5350A-B04225-GTR optimal for HDMI-centric consumer AV systems.

Availability

SI5350A-B04225-GTR is available at Aetrix Electronics and suitable for HDMI audio/video timing, residential gateway clock distribution, and printer/scanner timing requiring stable component supply, long-term lifecycle support, and guaranteed factory-programmed configurations.

Supply support for SI5350A-B04225-GTR 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, with leadership in RF, timing, and power management ICs.

The Si5350A family is designed for cost-sensitive, high-volume consumer and networking applications requiring flexible, low-jitter clock generation from a single crystal - replacing multiple discrete oscillators while maintaining signal integrity.

FAQ

What is the reference clock requirement for SI5350A-B04225-GTR?

The SI5350A-B04225-GTR requires a 25 MHz fundamental-mode AT-cut crystal connected across XA and XB pins. It does not accept external clock signals or 27 MHz crystals. Internal load capacitance is factory-configured (0/6/8/10 pF) via ClockBuilder Pro; external capacitors ≤2 pF may be added if needed. SI5350A-B04225-GTR cannot operate with voltage-controlled or CLKIN references - only the specified 25 MHz crystal.

Does SI5350A-B04225-GTR support I²C configuration?

No, SI5350A-B04225-GTR is factory-programmed and pin-controlled only. It lacks I²C interface pins and firmware - all functionality (frequencies, spread spectrum, output states, drive strength) is固化 at manufacturing. Configuration changes require ordering a new part number. This differs from Si5351A-B-GT, which supports runtime I²C writes. SI5350A-B04225-GTR boots directly to its programmed clocks without host intervention.

Can SI5350A-B04225-GTR generate frequencies above 112.5 MHz?

Yes, SI5350A-B04225-GTR supports frequencies up to 200 MHz, but only two *unique* frequencies above 112.5 MHz may be active simultaneously - e.g., 125 MHz on CLK0 and 130 MHz on CLK1 is valid, but adding 150 MHz on CLK2 violates the specification. Duplicate frequencies (e.g., 125 MHz on all three outputs) are permitted. This constraint arises from internal PLL bandwidth and MultiSynth resource allocation in the 3-output variant.

How is spread spectrum enabled or disabled on SI5350A-B04225-GTR?

Spread spectrum is enabled per-output during factory programming for PLLA-derived clocks only. It is globally disabled by pulling the SSEN pin (P1) low - a hardware control that requires no software or configuration change. SSEN has no effect on PLLB-synchronized outputs, and spread spectrum is unavailable on any output tied to PLLB. SI5350A-B04225-GTR does not support per-output SSEN control; the pin affects all spread-spectrum-enabled outputs simultaneously.

What are the power supply requirements for SI5350A-B04225-GTR?

SI5350A-B04225-GTR requires separate core (VDD) and output (VDDOA/VDDOB/VDDOC) supplies, each independently selectable at 1.8 V, 2.5 V, or 3.3 V. VDD must be powered before or concurrently with all VDDO rails. Typical core current is 20 mA (3 outputs enabled); per-output buffer current is 2.2–5.6 mA into 5 pF. Power-down mode (PDN = high) reduces current to 50 µA. SI5350A-B04225-GTR exhibits excellent PSRR, eliminating need for external LDO filtering.