ADF4112BRU

Overview

The ADF4112BRU is a single-channel integer-N RF PLL frequency synthesizer from Analog Devices, designed for local oscillator implementation in wireless transceivers. It operates with an input frequency range of 0.2 GHz to 3.0 GHz and supports a supply voltage of 2.7 V to 5.5 V. The device integrates a low-noise digital phase-frequency detector, precision charge pump, programmable reference divider, and dual-modulus prescaler. It consumes a typical current of 6.5 mA at 5 V and utilizes a 3-wire serial interface for register control. The component is housed in a 16-lead TSSOP package.

Feature Summary

• Integrated integer-N frequency synthesizer with a maximum RF input frequency of 3.0 GHz
• Programmable dual-modulus prescaler supporting division ratios of 8/9, 16/17, 32/33, and 64/65
• Separate charge pump supply (VP) pin allows extended tuning voltage up to 6.0 V in 3 V systems
• Features analog and digital lock detect capabilities with hardware and software power-down modes

Applications

• Local oscillators for GSM, PCS, DCS, CDMA, and WCDMA base stations
• Frequency synthesis for wireless handsets and mobile devices
• Signal generation for wireless LAN applications
• Reference sources for communications test equipment
• Frequency conversion stages in CATV equipment

Procurement Notes

Verify the specific suffix against the manufacturer's ordering guide, as it determines the packaging format such as tube or reel quantities. Confirm that the B version industrial temperature rating (-40°C to +85°C) aligns with the target application environment. Ensure ESD precautions are observed during handling due to the sensitivity of the CMOS and bipolar transistor count.

Selection Notes

Select the ADF4112BRU when the required RF input frequency extends up to 3.0 GHz, distinguishing it from the lower-frequency ADF4110 and ADF4111 variants. Consider the separate VP pin if the system requires a tuning voltage exceeding the main AVDD supply level. Verify that the programmable charge pump currents and prescaler settings meet the loop filter design requirements for the desired phase noise and spurious performance.

Part Context

The ADF4112BRU belongs to the ADF4110 family of integer-N synthesizers, which share a common functional block diagram and control interface. This family includes the ADF4110 (550 MHz), ADF4111 (1.2 GHz), and ADF4113 (4.0 GHz). All members utilize the same 16-lead TSSOP or LFCSP packages and support identical 3-wire serial programming protocols, facilitating design scalability across different frequency bands.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation.