SIT3809AI-2-25NB

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Programmable oscillators are considered among the most versatile and preferred solutions in a wide range of various applications in the electronics industry. This article focuses on a particular programmable oscillator, SIT3809AI-2-25NB, and its various application fields & working principles.

The SIT3809AI-2-25NB model is a Programmable Oscillator (PO) developed by SiTime. It is a highly-integrated, low-power oscillator featuring a wide range of frequency and duty cycle selections. This specific PO also features a low maximum jitter of just 13ps (maximum) - with reach 185ps for frequencies below 1MHz. The device also provides excellent performance under extreme temperature conditions, making it well-suited for automatically-controlled applications.

The SIT3809AI-2-25NB can be used in many application fields due to its flexible frequency range, precision, wide-temperature range, low-jitter, and low-power consumption of just 2.2mA. Some of the commonly used areas are:

• Office equipment, such as photocopiers, printers, scanners and more
• Telecommunications, including base stations and mobile handsets
• Industrial controls and automation, including industrial robots and other technologies
• Automotive, including chassis control, motor control, power steering and other systems
• Medical instruments, such as patient monitors and ultrasound systems
• Test and measurement equipment
• Graphics and gaming
• Home appliances, such as digital TVs and household devices

The programmable oscillator is well-suited for applications such as clock generators, clock dividers, pulse width modulators and frequency shifters, typically used in consumer electronics and networking equipment. It can also be used as a phase-locked loop in controlling servo motors, and as a frequency multiplier or synthesiser in radio and TV broadcasting systems.

The SIT3809AI-2-25NB PO has a working principle based on a PLL (phase locked loop) architecture, which implements frequency control to maintain a stable output frequency over a wide range of conditions. This is accomplished through the use of two internal oscillators (fre-quency feedback and reference oscillators). The frequency feedback oscillator (FFO) is driven by the reference oscillator, and the two are connected by a phase detector, which continuously adjusts the frequency of the FFO so that it remains in phase with the reference (or “master”) oscillator.

The SIT3809AI-2-25NB PO features a wide selection of frequencies up to 50MHz and duty cycles from 10% to 90%. With its highly-integrated design, the unit is able to provide maximum signal integrity, low jitter and low EMI. The PO also supports a wide temperature range (-40°C to +85°C) and is available in an 8-Pin SOIC or TSSOP package.

In summary, the SIT3809AI-2-25NB programmable oscillator is a highly integrated and low-power device, providing outstanding performance and flexibility. With its wide range of frequency, duty cycle and temperature selections, as well as its wide range of application fields, the PO offers a comprehensive solution for any kind of precise timing application.

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