SIT1602BIL7-18S

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Programmable oscillators refer to oscillating devices that allow users to adjust the frequency and other parameters through programming. Among programmable oscillators, SIT1602BIL7-18S is a typical frequency synthesizer. It combines complete functions and high integration, making it relatively easy to design oscillators.

The SIT1602BIL7-18S is composed of frequency synthesizer logic and PLL logic, which realizes high frequency hopping and attenuation with high frequency stability, and can realize frequency modulation. Its application frequency range is from 100 kHz to 2 GHz, and the output frequency accuracy is ±75 Hz. The circuit structure of the chip integrates a complete frequency setting and programming circuit, which makes the circuit design of the oscillation circuit simpler. Therefore, the SIT1602BIL7-18S can be used in HBT/GaAs transmitters, millimeter wave communication systems, local oscillators for satellite communications, frequency hopping/frequency tracking systems, harmonic generators, sweep circuits, and jitter reduction circuits.

The working principle of the SIT1602BIL7-18S involves two separate components— the frequency synthesizer logic and the PLL logic. The frequency synthesizer logic consists of two parts: the frequency synthesizer and the frequency setting and programming circuit. The frequency synthesizer sets the frequency by controlling the phase-splitter and selector that adjusts the phase of the oscillator. The frequency setting and programming circuit is responsible for setting the various parameters of the frequency synthesizer. The PLL Logic consists of three parts: a divide-by-N mechanism, a phase-locked loop, and a dividing nyquist order dynamic phase filter. The divide-by-N mechanism divides the input frequency into a fixed output frequency. The phase-locked loop locks the output frequency at its target value. The dividing Nyquist order dynamic phase filter eliminates the jitter of the output signal.

In summary, SIT1602BIL7-18S is a programmable oscillator that combines complete functions and high integration. Its application field covers HBT/GaAs transmitters, millimeter wave communication systems, local oscillators for satellite communications, frequency hopping/frequency tracking systems, harmonic generators, sweep circuits and jitter reduction circuits. The working principle of this frequency synthesizer involves two components— the frequency synthesizer logic and the PLL logic— which collaborate to provide precision tuning capabilities.

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