ADF4218LBRUZ-REEL7

Overview

The ADF4218LBRUZ-REEL7 is a dual low power frequency synthesizer from Analog Devices, designed for local oscillator implementation in wireless transceivers. It integrates two independent PLLs (RF and IF) within a single 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 up to 3.0 GHz and an IF input range up to 1.1 GHz. It features 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 Independent Synthesizers: Contains separate RF and IF PLL sections allowing simultaneous operation for up-conversion and down-conversion paths.
• Wide Frequency Range: Supports RF inputs up to 3.0 GHz and IF inputs up to 1.1 GHz with high sensitivity (-15 dBm).
• Low Power Consumption: Typical total supply current is 7.1 mA; includes a low power sleep mode drawing 1 µA.
• Programmable Architecture: Features selectable dual modulus prescalers (e.g., 32/33 or 64/65 for RF) and adjustable charge pump currents.

Applications

• Wireless Handsets (GSM, PCS, DCS, CDMA, WCDMA)
• Base Stations for Wireless Radio Systems
• Wireless LANs
• Communications Test Equipment

Procurement Notes

Verify the specific ordering suffix REEL7 corresponds to tape and reel packaging when sourcing. Confirm that the B version meets the required industrial temperature range of -40°C to +85°C. Ensure the design accounts for the 20-pin TSSOP footprint and appropriate decoupling for the separate VP1 and VP2 charge pump supplies.

Selection Notes

Select this component when a compact solution for dual-loop synthesis is required. The ADF4218L is suitable for applications needing RF frequencies up to 3.0 GHz. Compare against the ADF4219L if higher IF bandwidth (1.0 GHz vs 1.1 GHz) or different prescaler options are needed. Ensure the external VCO can be driven by the available charge pump currents (1 mA or 4 mA typ).

Part Context

This part 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 performance ADF4219L, offering a 3.0 GHz RF limit. The BRUZ designation indicates the Thin Shrink Small Outline Package (TSSOP) with a -40°C to +85°C operating range.

Replacement Considerations

Direct functional substitutes within the same package include the ADF4217LBRUZ (lower RF limit) and ADF4219LBRUZ (different IF characteristics). Verify pin compatibility and register configuration before swapping, as prescaler options differ across the family.