ADF4158CCPZ-RL7

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The ADF4158CCPZ-RL7 is an ultra-low power prescaler and fractional-N phase lock loop (PLL) frequency synthesizer that operates at a selectable frequency range of 8.25 GHz to 10 GHz. It is a highly integrated device optimized for low power and low phase noise applications. This device provides frequency synthesis and phase noise performance as well as harmonic suppression.

The ADF4158CCPZ-RL7 belongs to the Clock/Timing category of components and is principally used in Clock Generators, PLLs and Frequency Synthesizers.

The applications of the ADF4158CCPZ-RL7 are in the industries of wireless communication, automotive infotainment, and diagnostics, radio equipment, cellular radio base stations, machine-to-machine communication, and other fields that require ultra-low power, low noise, and fast settling time of PLLs.

The ADF4158CCPZ-RL7 features a broad selection of output frequencies that are selectable from 8.25 GHz to 10 GHz with a maximum frequency accuracy of 250 ppm by means of one external resistor. The device\'s built-in RF synthesizers use voltage controlled oscillators (VCOs) and provide a programmable divide-by-2 stage with a divide range of 2 to 8192. This allows the user to mix and match filters, divide ratios, PFD damping, loop bandwidths, and output divider ratios.

In order to enable rapid frequency tuning, an additional fine-tune voltage tuning pin (Vtrl) is provided for fine frequency adjustment over a wide range of +/–250–ppm frequency deviation from the nominal setting. This is useful where precise frequency control is needed from a slightly different input reference frequency or when fine tuning is required over temperature or supply voltage.

The working principle of the ADF4158CCPZ-RL7 starts with a reference signal. The reference signal is passed through a prescaler and a dual modulus divider and is used as the reference source for the voltage controlled oscillator (VCO). The VCO generates an output signal, which is divided back down to the reference frequency. The divided output is then compared to the reference signal, the error signal is then used to drive the VCO. This ensures the VCO output is locked to the reference frequency and allows the output frequency to be tuned.

The prescaler divides the reference frequency (Ref) down to the desired frequency (Ref\/Nyquist). The Nyquist frequency is designed to provide the highest frequency setting without exceeding the VCO’s maximum frequency specification. For example, the maximum frequency specification of the ADF4158CCPZ-RL7 is 10 GHz, so the Nyquist frequency would need to be less than 5 GHz. The user can adjust this frequency by adjusting the N-divider ratio with the reference input. This range is adjustable, as it is limited by the frequency range of VCO and the Nyquist frequency.

The dual modulus divider incremented by one every cycle and decremented by one if the phase comparator output is higher than the reference signal. The dual modulus divides the VCO frequency down to the desired output frequency. The reference signal and the outputs from the dual modulus divider are compared by a phase comparator. This comparison will generate an error signal, which is used to control the voltage controlled oscillator. This allows for rapid frequency tuning without settling times, as the phase comparator is always locked to the reference signal. The error signal is then used to control the voltage of the VCO to achieve the desired output frequency.

In conclusion, the application field of the ADF4158CCPZ-RL7 is mainly in Clock Generators, PLLs, Frequency Synthesizers and the working principle of this device is to use a reference signal and a dual modulus divider to generate an error signal that is then used to control the VCO. This allows the device to output the desired frequency with rapid frequency tuning, low power consumption and low phase noise applications.

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