SIT9003AC-3-28EQ

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Programmable oscillators are electronic circuits that generate a periodic waveform at a particular frequency, which can be determined by the user. One type of oscillator that falls into this category is the SIT9003AC-3-28EQ series, which is a highly configurable frequency synthesizer. This device is capable of producing a variety of waveforms and can be used in a wide range of applications.

The SIT9003AC-3-28EQ is a 28-bit frequency synthesizer IC capable of generating frequencies up to 2500 MHz with a frequency accuracy of ±10 ppm. The device features an advanced phase-lock-loop architecture with integral step-time synchronous divider, eliminating the need for an external crystal oscillator. It also provides a wide variety of programmable options such as adjustable frequency span, output waveforms and phase delay for exact frequency adjustment.

The SIT9003AC-3-28EQ is widely used in a variety of applications such as radio receiver/transmitter, frequency synthesis for general-purpose equipment, clock synchronization, frequency synthesizers for wireless communications, IEEE 802.11b, and Global Positioning Systems (GPS). It is also widely used in RF receivers and amplifiers, cellular base station control systems, digital television, and video broadcast applications.

The working principle of the SIT9003AC-3-28EQ is based on two key components, the voltage controlled oscillator (VCO) and the phase/frequency detector (PFD). The VCO is a type of circuit that generates a sinusoidal output that can be varied in frequency by changing the input voltage. The PFD monitors the VCO\'s output and compares it to the desired frequency that is set by the user. If the two frequencies differ, the PFD will adjust the VCO\'s input voltage to bring it back into line.

Once the frequencies are equal, a type of circuit known as an Frequency Lock Loop (FLL) is triggered to keep the VCO\'s output frequency stable. The FLL consists of a low pass filter and a voltage amplifier, which together form a feedback loop. The output from the amplifier is fed back to the VCO, ensuring that the output frequency remains constant regardless of any changes to the input voltage.

In summary, the SIT9003AC-3-28EQ is a highly configurable and versatile programmable oscillator that can generate a range of waveforms. It is used in a variety of applications due to its flexible frequency setting capability and ability to maintain the output frequency. The working principle of the SIT9003AC-3-28EQ is based on a VCO and PFD, while an FLL ensures that any frequency adjustments are accurately maintained. As a result, this oscillator offers a reliable and economical solution for many different applications.

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