ADF4216BRU

Overview

The ADF4216BRU is an obsolete dual RF PLL frequency synthesizer from Analog Devices, designed for local oscillator implementation in wireless transceivers. It integrates two independent synthesizers (RF and IF) featuring low-noise digital phase-frequency detectors, precision charge pumps, programmable reference dividers, and dual-modulus prescalers. The device supports a 3-wire serial interface and operates on a single supply voltage ranging from 2.7 V to 5.5 V. Key electrical parameters include a maximum RF input frequency of 1.2 GHz for the ADF4216 variant, selectable prescaler ratios (32/33 or 64/65 for RF; 8/9 or 16/17 for IF), and a typical operating current of 9 mA at 3 V with both sections active. It is housed in a 20-lead TSSOP package.

Feature Summary

• Dual independent synthesizers with separate RF and IF loops for upconversion and downconversion applications
• Programmable dual-modulus prescaler allowing flexible division ratios (RF: 32/33 or 64/65; IF: 8/9 or 16/17)
• Low-noise performance with a typical phase noise floor of -171 dBc/Hz at 25 kHz offset
• Integrated power-down mode reducing current consumption to less than 5 µA

Applications

• Wireless handsets supporting GSM, PCS, DCS, CDMA, and WCDMA standards
• Base stations for wireless radio systems including GSM, PCS, DCS, CDMA, and WCDMA
• WLAN infrastructure equipment
• Communications test and measurement instruments
• CATV signal processing equipment

Procurement Notes

The ADF4216BRU is classified as obsolete by the manufacturer. Verification of availability requires checking authorized distributors for remaining stock or end-of-life status. Designers should confirm that the component meets current regulatory requirements such as RoHS before procurement consideration.

Selection Notes

Select the ADF4216BRU when a dual-synthesizer solution is required for frequencies up to 1.2 GHz on the RF path. Ensure the design accommodates the 20-lead TSSOP package and provides external loop filters and VCOs. Consider the ADF4217 or ADF4218 if higher RF frequency coverage (up to 2.0 GHz or 2.5 GHz) is needed, noting they share the same pinout and interface.

Part Context

The ADF4216BRU belongs to the ADF4216/ADF4217/ADF4218 family of dual RF PLL frequency synthesizers. These devices were engineered to provide cost-effective, high-performance local oscillators for multi-standard wireless communication systems. The 'B' suffix indicates an industrial temperature range (-40°C to +85°C), and 'RU' denotes the Thin Shrink Small Outline Package.

Replacement Considerations

As the ADF4216BRU is obsolete, direct replacement may require redesigning the board layout if using newer generations. The ADF4217BRU and ADF4218BRU are pin-compatible upgrades offering higher RF frequency ranges. For modern designs, consider transitioning to newer Analog Devices synthesizer families such as the ADF43xx series.