ADF4108BCPZ-RL

Overview

The ADF4108BCPZ-RL is an Integer-N PLL frequency synthesizer from Analog Devices, housed in a 20-lead LFCSP package. It operates with a supply voltage of 3.2 V to 3.6 V and supports RF input frequencies from 1.0 GHz to 8.0 GHz. The device features a programmable dual-modulus prescaler (8/9, 16/17, 32/33, or 64/65) and a 14-bit R counter for reference division. Key electrical parameters include a maximum phase detector frequency of 104 MHz, a typical operating current of 15 mA, and a separate charge pump supply (VP) allowing extended tuning voltages up to 5.5 V.

Feature Summary

• Supports RF input frequencies from 1.0 GHz to 8.0 GHz with a bandwidth of 8.0 GHz.
• Features a programmable dual-modulus prescaler with options for 8/9, 16/17, 32/33, or 64/65 ratios.
• Includes a separate charge pump supply pin (VP) to enable extended tuning voltages in 3.3 V systems.
• Provides both analog and digital lock detect capabilities 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 'RL' indicates reel packaging when sourcing. Confirm that the B version meets the required industrial temperature range of -40°C to +85°C. Ensure the external loop filter design accounts for the programmable charge pump currents and the separate VP supply requirements for proper VCO driving.

Selection Notes

Select the appropriate prescaler value (P/P+1) based on the target RF frequency to ensure the divided output remains within the 300 MHz limit for the CMOS counters. Choose the charge pump current setting using the RSET resistor to match the loop filter design. Verify that the reference input frequency allows for the desired phase detector frequency without exceeding the 104 MHz maximum.

Part Context

This component belongs to the ADF4108 series of integer-N frequency synthesizers. It is designed for high-performance local oscillator generation in RF transceivers. The device integrates a low-noise PFD, precision charge pump, and programmable dividers into a compact chip-scale package, simplifying system architecture by potentially eliminating frequency doublers.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.