ADF4111BRUZ

Overview

The ADF4111BRUZ is a single-channel, integer-N phase-locked loop (PLL) frequency synthesizer from Analog Devices. It supports RF input frequencies ranging from 80 MHz to 1.2 GHz and operates on a power supply between 2.7 V and 5.5 V. The device integrates a low-noise digital phase-frequency detector, a precision charge pump with programmable current settings, and a dual-modulus prescaler. Key specifications include a typical operating current of 4.5 mA at 5 V and a maximum allowable prescaler output frequency of 200 MHz. It utilizes a 3-wire serial interface for register control and features hardware and software power-down modes.

Feature Summary

• RF Input Frequency Range: 80 MHz to 1.2 GHz
• Power Supply Voltage: 2.7 V to 5.5 V
• Programmable Dual-Modulus Prescaler: 8/9, 16/17, 32/33, 64/65
• Integrated Low-Noise Digital PFD and Precision Charge Pump

Applications

• Local oscillators in wireless receiver upconversion and downconversion sections
• Base stations for wireless radio systems including GSM, PCS, DCS, CDMA, and WCDMA
• Wireless handsets and Wireless LANs
• Communications test equipment and CATV equipment

Procurement Notes

Verify the specific package variant against the datasheet ordering guide. The BRUZ suffix indicates a TSSOP-16 package. Confirm that the B version meets the required industrial temperature range of -40°C to +85°C. Ensure the charge pump supply pin (VP) is correctly biased relative to AVDD for the target tuning voltage requirements.

Selection Notes

Select the ADF4111BRUZ when an RF input frequency up to 1.2 GHz is required. Compare it with the ADF4110 (550 MHz) if lower frequencies suffice or the ADF4112 (3.0 GHz) if higher frequencies are needed. Ensure the external loop filter and VCO are compatible with the programmable charge pump currents and the separate VP supply capability.

Part Context

The ADF4111BRUZ belongs to the ADF4110 family of RF PLL frequency synthesizers. This family shares a common architecture featuring a low-noise digital PFD, programmable counters, and a dual-modulus prescaler. The primary differentiation among family members is the maximum RF input frequency, with the ADF4111 positioned between the 550 MHz ADF4110 and the 3.0 GHz ADF4112.

Replacement Considerations

ADF4110BRUZ (Lower RF limit), ADF4112BRUZ (Higher RF limit). These parts share the same package and pinout but differ in maximum RF input frequency specifications.