ADF4158WCCPZ-RL7

Overview

The ADF4158WCCPZ-RL7 is a 6.1 GHz fractional-N frequency synthesizer with direct modulation and waveform generation capabilities, manufactured by Analog Devices Inc. It features a 25-bit fixed modulus enabling subhertz frequency resolution at the maximum RF bandwidth. The device integrates a low-noise digital phase frequency detector (PFD), a precision charge pump, and a programmable reference divider. Powered by a sigma-delta based fractional interpolator, it supports frequency shift keying (FSK) and phase shift keying (PSK) modulation. The component operates on a 2.7 V to 3.3 V supply and includes cycle slip reduction circuitry for faster lock times without loop filter modifications.

Feature Summary

• RF bandwidth up to 6.1 GHz with 25-bit fixed modulus for subhertz resolution
• Direct modulation support for FSK and PSK applications
• Integrated waveform generation including sawtooth, triangular, and parabolic ramps
• Cycle slip reduction circuitry for accelerated lock times
• Programmable charge pump currents ranging from 312.5 µA to 5 mA

Applications

• Frequency modulated continuous wave (FMCW) radar systems
• Communications test equipment
• Automotive radar applications

Procurement Notes

Verify that the specific suffix WCCPZ-RL7 corresponds to the automotive qualified C version operating between -40°C and +125°C. Confirm the package type is the 24-pin LFCSP with an exposed paddle requiring ground connection. Ensure the ordering information matches the Rev. I datasheet specifications for the correct pinout and electrical characteristics.

Selection Notes

Select this component when high-resolution frequency synthesis above 6 GHz is required alongside direct modulation features. The 25-bit modulus is critical for applications demanding fine frequency steps. Consider the separate VP pin if the voltage-controlled oscillator requires a tuning range exceeding the standard AVDD supply voltage. Verify compatibility with the 3-wire serial interface timing requirements for system integration.

Part Context

The ADF4158 belongs to Analog Devices' family of PLL frequency synthesizers designed for high-performance RF applications. It shares architectural similarities with other models in the series but is distinguished by its specific 6.1 GHz upper limit and integrated waveform generation logic. The device is part of the broader portfolio supporting wireless infrastructure and advanced sensing technologies.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should consult the official Analog Devices selection guide or ADIsimPLL tool for compatible alternatives within the same product family.

FAQ

How is the output frequency determined?

The output frequency is calculated using the formula: RFOUT = fPFD × (INT + (FRAC/2^25)), where INT and FRAC are register values and fPFD is the phase frequency detector frequency.

What is the purpose of the VP pin?

The VP pin serves as the charge pump power supply. It allows for an extended tuning voltage, typically up to 5.5 V, which can drive external voltage-controlled oscillators requiring higher tuning ranges than the main AVDD supply.

How does the device achieve faster lock times?

The ADF4158 features cycle slip reduction circuitry that accelerates lock times without requiring modifications to the external loop filter components.