ADF4218LBRUZ

Overview

The ADF4218LBRUZ is a dual low power frequency synthesizer from Analog Devices, designed for implementing local oscillators in wireless receivers and transmitters. It integrates two complete phase-locked loops (PLLs) for RF and IF sections within a TSSOP-20 package. The device operates on a 2.6 V to 3.3 V supply with a typical total current consumption of 7.1 mA. Key electrical specifications include an RF input frequency range of 0.15 GHz to 3.0 GHz and an IF input range of 0.045 GHz to 1.1 GHz. It features a 14-bit reference counter, selectable dual modulus prescalers, and precision charge pumps with 1% matching accuracy.

Feature Summary

• Dual Integer-N PLL architecture supporting independent RF and IF frequency synthesis
• Low power consumption with 7.1 mA typical current at 3 V supply
• Integrated 14-bit R counters and programmable N dividers (N = BP + A)
• Selectable dual modulus prescaler (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 and communications test equipment

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and temperature range. The BRUZ suffix indicates a Thin Shrink Small Outline Package (TSSOP) with an industrial operating temperature range of -40°C to +85°C. Ensure compatibility with existing board layouts regarding the 20-pin TSSOP footprint and thermal requirements.

Selection Notes

Select this component when dual synthesizer functionality is required within a single IC to reduce board space. The ADF4218L is suitable for applications requiring RF inputs up to 3.0 GHz. Compare against the ADF4217L and ADF4219L if different IF bandwidths or prescaler configurations are needed. Ensure external VCOs and loop filters are selected to match the charge pump currents and voltage ranges specified in the datasheet.

Part Context

The ADF4218L is part of the ADF4217L/ADF4218L/ADF4219L family of dual low power frequency synthesizers. These devices share a common functional block diagram and control interface but differ in IF input frequency limits and prescaler options. The ADF4218L specifically bridges the gap between the lower frequency ADF4217L and the higher frequency ADF4219L.

Replacement Considerations

Direct pin-compatible replacements within the same family include the ADF4217LBRUZ and ADF4219LBRUZ. Verify that the IF input frequency requirements of the application fall within the specific limits of the substitute part, as the ADF4217L has a lower IF limit (1.1 GHz) and the ADF4219L has a different IF structure.