ADF4111BRU

Overview

The ADF4111BRU is an RF PLL frequency synthesizer from Analog Devices, designed for local oscillator implementation in wireless transceivers. It supports a maximum RF input frequency of 1.2 GHz and operates on a 2.7 V to 5.5 V power supply. The device integrates a low-noise digital phase frequency detector, a precision charge pump with programmable currents, and a programmable reference divider. Key specifications include a typical operating current of 4.5 mA at 5 V and an industrial temperature range of -40°C to +85°C. It utilizes a 3-wire serial interface for register control and offers hardware and software power-down modes.

Feature Summary

• Maximum RF input frequency of 1.2 GHz
• Programmable dual-modulus prescaler (8/9, 16/17, 32/33, 64/65)
• Separate VP pin allows extended tuning voltage up to 6.0 V
• Analog and digital lock detect outputs

Applications

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

Procurement Notes

Verify the package type matches the design requirements, as the ADF4111 family is available in TSSOP-16 and LFCSP packages. Confirm that the specific suffix indicates the correct temperature grade and packaging format. Ensure the ordering information aligns with the manufacturer's current documentation to avoid discrepancies in electrical characteristics or pinout definitions.

Selection Notes

Select the ADF4111 when the application requires a frequency synthesizer with an RF input range extending up to 1.2 GHz. Consider this component if the system design benefits from a separate charge pump supply (VP) to support higher VCO tuning voltages in 3 V systems. Verify that the required division ratios can be achieved using the programmable A and B counters in conjunction with the selected prescaler modulus.

Part Context

The ADF4111 is part of the ADF4110 family, which includes the ADF4110, ADF4112, and ADF4113. These devices share similar architectures and pinouts but differ primarily in their maximum RF input frequencies, ranging from 550 MHz to 4.0 GHz. This family is designed for compatibility within wireless communication systems requiring integer-N frequency synthesis.

Replacement Considerations

The ADF4110, ADF4112, and ADF4113 are pin-compatible alternatives within the same family. Selection among these depends on whether the specific RF frequency requirement is below 550 MHz, between 550 MHz and 1.2 GHz, or above 1.2 GHz up to 4.0 GHz.