ADF4116BRU

Overview

The ADF4116BRU is an integer-N RF PLL frequency synthesizer from Analog Devices, designed for local oscillator implementation in wireless transceivers. It features a low-noise digital phase frequency detector, precision charge pump, and dual-modulus prescaler (8/9). The device supports input frequencies from 80 MHz to 550 MHz and operates on a 2.7 V to 5.5 V supply. Key specifications include a maximum PFD frequency of 55 MHz, selectable charge pump currents (250 µA or 1 mA), and a 3-wire serial interface. It includes digital lock detect, power-down mode, and Fastlock functionality.

Feature Summary

• Dual-modulus prescaler with 8/9 modulus configuration
• Digital lock detect and analog lock detect outputs
• Programmable reference divider (R counter) up to 16,383
• Fastlock mode for rapid PLL settling

Applications

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

Procurement Notes

Verify the specific suffix 'RU' against the manufacturer's current ordering guide, as datasheets often list 'BRU' or 'BRUZ'. Confirm package availability and lead times directly with Analog Devices or authorized distributors, as stock levels vary by region.

Selection Notes

Select the ADF4116BRU when the required RF input frequency range is within 80 MHz to 550 MHz. Ensure the system requires an integer-N architecture. Verify that the external VCO tuning voltage requirements are met by the separate VP pin capability, which allows extended tuning ranges in 3 V systems.

Part Context

The ADF4116 is part of the ADF411x family, which also includes the ADF4117 (up to 1.2 GHz) and ADF4118 (up to 3.0 GHz). These devices share similar internal architectures and register maps but differ in prescaler modulus and maximum operating frequencies.

Replacement Considerations

The ADF4117BRU and ADF4118BRU are functionally compatible within their respective frequency ranges. For lower frequency applications, the ADF4110 series may be considered if cost or specific performance metrics differ.