ADF4108BCPZ-RL7

Overview

The ADF4108BCPZ-RL7 is an Integer-N PLL frequency synthesizer from Analog Devices, housed in a 20-lead LFCSP package. It operates with AVDD and DVDD between 3.2 V and 3.6 V, consuming a typical current of 15 mA. The device supports RF input frequencies from 1.0 GHz to 8.0 GHz and features a programmable dual-modulus prescaler (8/9, 16/17, 32/33, or 64/65). It includes a low-noise digital phase-frequency detector, a precision charge pump with programmable currents up to 5 mA, and a 14-bit reference counter. The component utilizes a 3-wire serial interface for configuration.

Feature Summary

• Supports RF input frequencies from 1.0 GHz to 8.0 GHz with a maximum output frequency of 325 MHz at the prescaler stage.
• Features a programmable dual-modulus prescaler with options for 8/9, 16/17, 32/33, or 64/65 division ratios.
• Includes a separate charge pump supply pin (VP) allowing extended tuning voltage up to 5.5 V while maintaining 3.3 V logic operation.
• Provides both analog and digital lock detect functions accessible via the MUXOUT pin.

Applications

• Broadband wireless access systems
• Satellite communication systems
• Wireless LAN infrastructure
• Base stations for wireless radio networks

Procurement Notes

Verify the specific suffix RL7 corresponds to the reel packaging format when ordering. Confirm that the B version temperature range (-40°C to +85°C) meets the operational requirements. Ensure the external loop filter design accounts for the programmable charge pump currents and the separate VP supply voltage constraints defined in the datasheet specifications.

Selection Notes

Select this component for applications requiring high bandwidth to eliminate external frequency doublers. Choose the appropriate prescaler value (P) based on the target RF frequency to ensure the divided signal remains below 300 MHz for the CMOS counters. Verify that the RSET resistor value aligns with the desired charge pump current, noting that 5.1 kΩ yields a typical maximum current of 5 mA.

Part Context

This part belongs to the ADF4108 series of integer-N frequency synthesizers. It is designed to implement local oscillators in both upconversion and downconversion sections of wireless transceivers. The device simplifies system architecture by offering high bandwidth, which reduces the need for additional frequency multiplication stages in high-frequency designs.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Evaluate compatibility based on pinout, package dimensions (LFCSP-20), and electrical specifications if considering alternative devices.