ADF4151BCPZ-RL7

Overview

The ADF4151BCPZ-RL7 is a fractional-N and integer-N phase-locked loop (PLL) frequency synthesizer manufactured by Analog Devices Inc. It operates with a power supply ranging from 3.0 V to 3.6 V and supports an RF input bandwidth up to 3.5 GHz. The device features a low-noise digital phase frequency detector, a precision charge pump, and a programmable reference divider. Key electrical parameters include a maximum PFD frequency of 32 MHz in integer-N mode and a normalized in-band phase noise floor of -221 dBc/Hz. It utilizes a 3-wire serial interface for register control and is housed in a 5 mm × 5 mm LFCSP package.

Feature Summary

• Supports both Fractional-N and Integer-N PLL synthesis modes
• RF bandwidth extends up to 3.5 GHz with a programmable dual-modulus prescaler (4/5 or 8/9)
• Includes cycle slip reduction circuitry for faster lock times without loop filter modifications
• Features separate charge pump supply (VP) allowing extended tuning voltage up to 5.5 V

Applications

• Wireless infrastructure systems including W-CDMA, TD-SCDMA, WiMax, GSM, PCS, DCS, and DECT
• Test and measurement equipment requiring precise frequency generation
• Wireless LANs and CATV equipment
• General clock generation applications

Procurement Notes

Verify the specific ordering suffix RL7 corresponds to the reel packaging configuration required for your assembly line. Confirm that the B version grade meets the specified temperature range of −40°C to +85°C. Ensure that the LFCSP-24 package dimensions align with your PCB footprint design guidelines before finalizing procurement orders.

Selection Notes

Select this component when designing systems requiring high flexibility between fractional and integer division ratios. The ADF4151 is footprint and software compatible with the ADF4350, facilitating direct upgrades for existing designs. Consider the separate VP pin if your application requires driving a VCO with a tuning range exceeding the standard AVDD supply voltage.

Part Context

This part belongs to the ADF4151 series of PLL frequency synthesizers. It serves as a core component for local oscillator implementation in wireless transceivers and receivers. The device integrates a Σ-Δ based fractional interpolator to enable programmable fractional-N division, distinguishing it from pure integer-N synthesizers in its ability to generate finer frequency steps.

Replacement Considerations

The ADF4151 is explicitly noted as being footprint and software compatible with the ADF4350. Designers upgrading from other models should verify register compatibility and ensure that the external VCO and loop filter components support the specific current and voltage characteristics of the ADF4151.