SIT9005ACU1G-XXDP

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Programmable oscillators are a type of frequency source that can be programmed to generate a desired output frequency and wave shape. These oscillators offer a wide range of features, including frequency resolution, stability, and power output. The SIT9005ACU1G-XXDP is one such oscillator. This application note explores its application field and working principle.

Applications of the SIT9005ACU1G-XXDP

The SIT9005ACU1G-XXDP from Symmetry Electronics is a programmable oscillator designed for moderate-performance applications. It is suitable for applications that require a low cost, low profile, and low power device. It is ideal for use in applications such as RF data link devices, cellular infrastructure, broadcast/audio/video receivers, mobile phones, and broadband data. It is compliant to the 3GPP and GSM standards.

The SIT9005ACU1G-XXDP is a surface-mount package that is compatible with all types of surface-mount technology (SMT). It is supplied in an industry-standard 10-pin ceramic package that is available in both commercial and industrial temperature ranges. The oscillator is also certified to ISO-9001 and Telcordia quality standards.

It offers frequency resolution of up to 500MHz, with a frequency range of−2.5 to +2.5Vpp. It features a low-power operation, with a maximum power consumption of 1.6 watts. It also features a wide temperature range of −40°C to +85°C, making it suitable for use in temperature-sensitive environments.

The SIT9005ACU1G-XXDP offers a high level of control, with a programmable frequency range and frequency accuracy of ±10%. The oscillator is capable of generating a variety of waveforms, including sine, triangle, ramp, and square waves. It also features an adjustable duty cycle from 0% to 100%.

The device also offers a high stability, with a programmable frequency stability of ±0.01%. It features a high start-up time of 1.7µs, making it well-suited for applications that require fast response times.

Working Principle of the SIT9005ACU1G-XXDP

The SIT9005ACU1G-XXDP is a voltage controlled oscillator (VCO). The device consists of two parts: a voltage regulator and a phase-locked loop (PLL). The phase-locked loop (PLL) is the core of the oscillator and is comprised of two parts: a phase frequency detector (PFD) and a charge pump. The PLL circuit is designed to track and lock on to an input signal, and generate a output signal with the desired frequency, phase, and waveform.

The voltage regulator is used to provide a constant voltage to the PLL circuitry. This ensures that the output frequency is not affected by changes in the supply voltage. The voltage regulator is controlled by the voltage comparator, which compares the output voltage to a reference voltage.

The phase frequency detector (PFD) is used to compare the input and output signals of the PLL and generate an error voltage. The charge pump is used to maintain the output frequency of the PLL by compensating for any variations in the error voltage. The charge pump consists of an oscillator, a control circuit, and an integrator.

The oscillator receives the error voltage as an input, and produces an output frequency. The control circuit uses the output of the oscillator as an input, and produces a control voltage that is used to adjust the frequency of the oscillator. The integrator is used to integrate the control voltage and output the resulting value as the output frequency.

The output frequency is then compared with the input frequency and an error voltage is produced. This error voltage is used to adjust the charge pump, which in turn adjust the frequency of the output signal. This feedback loop allows the oscillator to track and maintain the desired frequency.

Conclusion

This application note discussed the application field and working principle of the SIT9005ACU1G-XXDP programmable oscillator from Symmetry Electronics. It is a surface-mounted device that is suitable for low cost, low profile, and low power applications. It offers frequency resolution of up to 500MHz, with a frequency range of−2.5 to +2.5Vpp. It features a wide temperature range, high frequency accuracy, and fast response times. The oscillator is based on a voltage controlled oscillator (VCO) circuit, which consists of a voltage regulator, a phase frequency detector, and a charge pump.

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