ADF41513BCPZ-RL7

Overview

The ADF41513BCPZ-RL7 is a high-performance frequency synthesizer designed for local oscillator applications up to 26.5 GHz. It supports both integer-N and fractional-N phase-locked loop (PLL) configurations, utilizing a silicon germanium (SiGe) BiCMOS process to achieve an ultralow normalized phase noise floor of −235 dBc/Hz in integer mode and −231 dBc/Hz in fractional mode. The device features a maximum phase frequency detector (PFD) frequency of 250 MHz for integer operation and 125 MHz for fractional operation. It incorporates a 25-bit fixed or 49-bit variable modulus sigma-delta modulator for sub-Hertz frequency resolution. Powered by a single 3.3 V supply with integrated 1.8 V logic, it operates within a temperature range of −40°C to +105°C.

Feature Summary

• Operates across a 1 GHz to 26.5 GHz bandwidth, eliminating the need for external frequency multipliers or dividers.
• Features a programmable charge pump with a 16× current range and digital lock detect functionality.
• Includes hardware and software power-down modes to minimize power consumption during idle states.
• Supports a 3-wire serial interface with register readback capability for system verification.

Applications

• Test equipment and instrumentation
• Wireless infrastructure systems
• Microwave point-to-point and multipoint radios
• Very small aperture terminal (VSAT) radios
• Aerospace and defense electronics

Procurement Notes

Verify that the component matches the specific Rev. A datasheet specifications. Confirm the package type is the 24-lead 4 mm × 4 mm LFCSP. Ensure handling procedures account for ESD sensitivity, as the device requires proper electrostatic discharge precautions during assembly and storage.

Selection Notes

Select this component when designing systems requiring local oscillators above 16 GHz without intermediate frequency conversion stages. The choice between 25-bit fixed and 49-bit variable modulus depends on whether exact frequency resolution or simplified spur management is prioritized. Ensure the external voltage-controlled oscillator (VCO) input sensitivity aligns with the RF input requirements specified in the datasheet.

Part Context

This part belongs to the Analog Devices ADF41513 family of PLL synthesizers. The suffix -RL7 indicates the reel packaging format used for automated surface-mount assembly. It is distinct from other ADF series devices by its specific 26.5 GHz upper frequency limit and SiGe BiCMOS construction optimized for low phase noise performance.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should consult official Analog Devices resources for cross-reference information regarding alternative components with similar frequency ranges and noise specifications.

FAQ

What is the difference between the 25-bit fixed and 49-bit variable modulus modes?

The 25-bit fixed modulus provides sub-Hertz frequency resolution with potentially lower spurious content due to simpler modulation. The 49-bit variable modulus allows for exact sub-Hertz frequency resolution but may require more complex loop filter design to manage spurs generated by the higher-order modulation.

How is the charge pump current set?

The maximum charge pump current is determined by the resistor connected between the RSET pin and ground. The relationship is defined as ICP_MAX = 12.96/RSET, allowing for a programmable range with a 16× adjustment capability via serial control bits.

Can the ADF41513 operate without an external reference signal?

No, the device requires an external reference signal at the REFIN pin to generate the phase frequency detector clock. However, the reference input circuit remains active during power-down, drawing approximately 600 µA from AVDD4 even if no reference is connected.