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Precise timing is critical in many industrial and scientific applications. A reliable clock generator ensures synchronized operations, accurate data logging, and stable system performance. Selecting the appropriate model for your specific needs can prevent costly errors and optimize workflow efficiency.
The Si5351 is an I2C configurable clock generator that is ideally suited for replacing crystals, crystal oscillators, VCXOs, phase-locked loops (PLLs), and fanout buffers in cost-sensitive applications.
This chip has a precision 25MHz crystal reference and internal PLL and dividers so it can generate just about any frequency, from <8KHz up to 150+ MHz.
It uses the onboard precision clock to drive multiple PLL's and clock dividers using I2C instructions. By setting up the PLL and dividers you can create precise and arbitrary frequencies. There are three independent outputs, and each one can have a...
CJMCU-5351 Si5351A Si5351 Clock 8KHz-160MHz signal generator breakout board for I2C Controller SMA Connector 3.3V LDO.
The Si5351A generates up to 8 free-running clocks using an internal oscillator to replace crystals and crystal oscillators.
Wide Frequency Range:** Easily generate frequencies from 8KHz to over 160MHz using the Si5351A Clock Signal Generator, perfect for RF projects, testing, and more.
Precision and Stability:** Equipped with a 25MHz crystal reference, this module ensures high precision and stability for all your signal generation needs.
Flexible and Compatible:** Operates at 3-5V DC, compatible with both 3.3V and 5V systems, making it ideal for integration with Arduino and STM32 projects.
Easy Integration:** I2C configurable for straightforward setup and control, replacing traditional crystals, oscillators, and PLLs in cost-sensitive applications.
Versatile Output Options:** Delivers 3Vpp square wave signals via a breadboard-friendly header or optional SMA connector, providing flexibility in your prototyping and development work.
SSi5351A I2C Generator Clock Breakout Board 8KHz to 160MHz for Arduino
Never hunt around for another crystal again, with the Si5351A clock generator breakout ! This chip has a precision 25MHz crystal reference and internal PLL and dividers so it can generate just about any frequency, from <8KHz up to 150+ MHz.
The Si5351A clock generator is an I2C controller clock generator. It uses the onboard precision clock to drive multiple PLL's and clock dividers using I2C instructions. By setting up the PLL and dividers you can create precise and arbitrary frequencies...
We put this handy little chip onto it's own breakout board PCB, with a 3.3V LDO regulator so it can be powered from 3-5VDC. We also put level shifting circuitry on the I2C lines so you can use this chip safely with 3V or 5V logic.
for use with the Arduino microcontroller and IDE but is easily ported to your favorite platform with I2C support.
Si5351A Si5351 Clock 8KHz-160MHz Signal Generator Breakout Board For Arduino IDE I2C Controller SMA Connector 3.3V LDO.
The Si5351 is an I2C configurable clock generator that is ideally suited to replace crystals, crystal oscillators, VCXOs, phase locked loops (PLLs) and fanout buffers in cost sensitive applications.
Based on a high resolution MultiSynth PLL / VCXO + split divider architecture, the Si5351 can generate any frequency up to 160 MHz on each of its outputs with an error of 0 ppm.
It uses the onboard precision clock to drive multiple PLL's and clock dividers using I2C instructions. By setting up the PLL and dividers you can create precise and arbitrary frequencies. There are three independent outputs, and each one can have a...
The Si5351A generates up to 8 free-running clocks using an internal oscillator to replace crystals and crystal oscillators.
【Programmable Clock Module】 Three independent LVCMOS outputs (CLK0/CLK1/CLK2); 2.5 kHz to 200 MHz frequency range; ±0 ppm accuracy via PLL fractional synthesis; Suitable for FPGA and MCU clocking applications
【Low Power Consumption】 Operating current ≤22 mA at 3.3 V; standby current ≤1 µA in deep sleep mode; supports 2.25–3.6 V core supply and 1.8–3.3 V output voltage; suitable for portable and low-power systems
【Robust I²C Interface】 I²C communication (address 0x60); 100–400 kbps data rate; built-in crystal oscillator (25 or 27 MHz); compatible with for Arduino, for Raspberry Pi, and STM32 platforms
【EMI-Resistant Design】 Programmable spread spectrum modulation (SSM) reduces electromagnetic interference; separate VDD and VDDO power supplies for noise isolation; operates reliably in industrial Settings (-40°C to +85°C)
【Easy Configuration and Integration】 Glitch-free frequency switching; no calibration drift; simple register setup via I²C; includes detailed pinout and configuration guide for quick deployment in digital systems
The Si5351 Clock Signal Generator Module offers unparalleled precision, generating clock signals with an error of 0ppm. Its wide frequency range of 8KHz to 160MHz caters to various applications, from basic to high-end projects. With three independent...
This module replaces the need for multiple components such as crystal oscillators, VCOs, and phase-locked loops. Its integrated PLL/VCXO+high-resolution multi-synthesizer structure simplifies your design, reducing complexity and saving you cost and space...
The onboard 3.3V voltage regulator and level conversion circuit ensure compatibility with both 3.3V and 5V TTL logic levels. This makes the Si5351 Clock Signal Generator Module a perfect fit for a wide range of microcontrollers and development boards for...
With I2C/IIC interface, programming the Si5351 is easy and intuitive. You can customize the frequency outputs to meet your exact needs, enabling you to fine-tune your designs for optimal performance. The module's programmability gives you the power to...
the Si5351Clock Signal Generator Module is designed to provide long-lasting performance and stability. It can withstand the rigors of continuous operation, ensuring your projects run smoothly and reliably. With its robust design, you can trust the...
【Programmable Square‑Wave Clock Generation】 SI5351 generates stable square‑wave clock signals with full digital control; wide programmable frequency range up to 160 MHz; fine frequency resolution via internal synthesis; supports flexible clock...
【Three Independent Clock Output Channels】 Provides CLK0, CLK1, and CLK2 as independent outputs; each channel can be configured with its own frequency; enables multi‑clock systems from one module; simplifies designs that require synchronized or...
【High‑Precision Frequency Control Via I2C】 Frequency and output settings are configured through the I2C interface; allows precise tuning and fast updates from firmware; reduces external component count; supports dynamic clock adjustment during...
【Wide 3.3 V To 5.0 V Power Compatibility】 Operates from 3.3 V to 5.0 V DC; compatible with common logic levels; supports direct connection to many microcontrollers; simplifies power design and allows flexible integration into mixed‑voltage projects
【Compact Module With Clear Pin Access】 Small PCB exposes VCC, GND, SCL, SDA, and three clock outputs; simplifies wiring and prototyping; saves board space; compatible with for Arduino and similar controllers using I2C for programmable clock generation
CTG-1A is a clock controlled tone generator designed to provide accurately timed bong alert tones or buzzer alert tone sounds over an existing paging system
Signal the beginning and end of class periods, breaks, and lunch periods for schools
Signal the beginning and end of shifts, breaks, and lunch periods for factories and other businesses
Provides a doorbell and/or alarm sounds over an existing paging system, for such applications as door entry, fire, severe weather, etc.
Use with Viking’s DVA-2WA to provide timed messages (DOD 110)
The Si5351 is an I2C configurable clock generator that is ideally suited for replacing crystals, crystal oscillators, VCXOs, phase-locked loops (PLLs), and fanout buffers in cost-sensitive applications.
The Si5351A clock generator is an I2C controller clock generator. It uses the onboard precision clock to drive multiple PLL's and clock dividers using I2C instructions.
This chip has a precision 25MHz crystal reference and internal PLL and dividers so it can generate just about any frequency, from <8KHz up to 150+ MHz.
We put this handy little chip onto it's own breakout board PCB, with a 3.3V LDO regulator so it can be powered from 3-5VDC.
Outputs are 3Vpp, either through a breadboard-friendly header or, for RF work, an optional SMA connector.
Last update on 2026-07-16 / Affiliate links / Images from Amazon Product Advertising API
How to Choose the Best Clock Generators
Understanding Clock Generator Types
Clock generators, also known as frequency synthesizers or clock sources, produce stable and accurate timing signals essential for digital systems. Key types include:
Crystal Oscillators (XO): Utilize a vibrating quartz crystal for frequency generation, offering good stability and low power consumption.
Temperature-Compensated Crystal Oscillators (TCXO): Enhance XO stability by compensating for temperature variations, crucial for outdoor or variable-environment applications.
Oven-Controlled Crystal Oscillators (OCXO): Provide the highest stability and accuracy by actively maintaining a constant temperature around the crystal. They are ideal for metrology and high-precision timing needs.
Synthesizers (DDS/PLL): Generate a wide range of frequencies from a single reference input, offering flexibility and programmability.
Key Specifications to Consider
When evaluating clock generators, several parameters are paramount:
Frequency Stability: Measures how much the output frequency deviates over time and temperature. Look for low drift (e.g., ppm or ppb).
Phase Noise: Indicates the short-term timing jitter or noise. Lower phase noise is critical for high-speed digital systems and RF applications.
Output Frequency Range: Ensure the generator covers the required frequency spectrum for your devices.
Output Types and Levels: Verify compatibility with your system's input requirements (e.g., LVDS, CMOS, Sine Wave) and signal amplitude.
Power Consumption: Important for battery-powered or space-constrained applications.
Application-Specific Needs
The intended use case significantly influences the choice. High-frequency trading platforms demand ultra-low jitter, while test and measurement equipment requires high accuracy and stability. Communication infrastructure often prioritizes phase noise performance and reliability. Consider the operating environment, power budget, and integration complexity when making your selection.
Frequently Asked Questions
What is the difference between phase noise and jitter?
Phase noise refers to the random fluctuations in the phase of a signal, often measured in the frequency domain. Jitter is the time-domain equivalent, representing the deviation of signal edges from their ideal positions. While related, phase noise is a more fundamental measure of signal purity.
How does temperature affect clock generator accuracy?
Temperature changes can cause the physical properties of the oscillator's components, particularly the quartz crystal, to shift. This shift alters the resonant frequency, leading to inaccuracies. TCXO and OCXO designs are specifically engineered to minimize these temperature-induced errors.
What are the common output signal types?
Common output signal types include CMOS (Complementary Metal-Oxide-Semiconductor), LVDS (Low-Voltage Differential Signaling), PECL (Positive-Edge Coupled Logic), and Sine Wave. The choice depends on the signal integrity requirements, speed, and compatibility with the receiving circuitry.
When is an OCXO necessary over a TCXO?
An OCXO is necessary when the absolute highest level of frequency stability and accuracy is required, often in applications like atomic clocks, high-end test equipment, or frequency standards. A TCXO is usually sufficient for applications where moderate temperature compensation is adequate.
Can a single clock generator serve multiple devices?
Yes, many clock generators are designed to distribute timing signals to multiple devices simultaneously. This requires considering the number of outputs, signal integrity over distribution traces, and potential loading effects on the primary clock source.
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