ADF4218LBRUZ-REEL

Overview

The ADF4218LBRUZ-REEL is a dual low power frequency synthesizer from Analog Devices, designed for local oscillator generation in wireless communication systems. It integrates two independent phase-locked loops (PLLs) for RF and IF sections within a TSSOP-20 package. The device supports an RF input bandwidth up to 3.0 GHz and an IF bandwidth of 1.1 GHz. Operating on a single 2.6 V to 3.3 V supply, it consumes a typical current of 7.1 mA with both loops active. Key features include selectable dual modulus prescalers, programmable charge pump currents (1 mA or 4 mA), and a 3-wire serial interface compatible with 1.8 V logic.

Feature Summary

• Dual Integer-N PLL architecture supporting simultaneous RF (up to 3.0 GHz) and IF (up to 1.1 GHz) synthesis
• Low power consumption: 7.1 mA typical total IDD at 3.0 V
• Programmable charge pump with selectable high (4 mA) and low (1 mA) currents
• Selectable dual modulus prescaler options (e.g., 64/65 or 32/33 for RF; 8/9 or 16/17 for IF)

Applications

• Wireless handsets (GSM, PCS, DCS, CDMA, WCDMA)
• Base stations for wireless radio systems
• Wireless LANs
• Communications test equipment

Procurement Notes

Verify the REEL suffix indicates tape-and-reel packaging when sourcing. Confirm the B version operates within the industrial temperature range of -40°C to +85°C. Ensure the specific ordering code matches the required package option, as other variants like LGA may exist for this family.

Selection Notes

Select the ADF4218L for applications requiring an RF bandwidth extending to 3.0 GHz. Verify that the external VCO tuning voltage does not exceed the VP pin maximum rating of 5.5 V. Ensure the reference input frequency allows for the desired PFD frequency, which has a maximum limit of 56 MHz.

Part Context

This component belongs to the ADF4217L/ADF4218L/ADF4219L family of dual frequency synthesizers. The ADF4218L specifically bridges the gap between the lower-frequency ADF4217L and the higher-bandwidth ADF4219L, offering a 3.0 GHz RF limit compared to the ADF4217L's 2.5 GHz limit.

Replacement Considerations

The ADF4217LBRUZ offers similar functionality but with a reduced RF input frequency maximum of 2.5 GHz. The ADF4219L provides extended IF bandwidth up to 1.0 GHz but differs in prescaler configurations.