Analog Devices Inc. ADF4355-2BCPZ-RL7

Overview

ADF4355-2BCPZ-RL7 from Analog Devices is a microwave wideband fractional-N/integer-N PLL frequency synthesizer with integrated VCO, supporting RF output from 54 MHz to 4400 MHz, 38-bit frequency resolution, and programmable divide-by-1/2/4/8/16/32/64 outputs. It operates with 3.3 V analog/digital supplies and 5 V charge pump/VCO supplies, and is used in wireless infrastructure base stations for W-CDMA, WiMAX, and GSM frequency planning.

For engineers reviewing the ADF4355-2BCPZ-RL7 datasheet, ADF4355-2BCPZ-RL7 pinout, ADF4355-2BCPZ-RL7 application, or ADF4355-2BCPZ-RL7 equivalent, key selection criteria include VCO fundamental range (3400–6800 MHz), phase noise floor (−223 dBc/Hz normalized for integer mode), RF output mute capability, 3-wire serial interface timing (50 MHz max CLK), and dual RF output pairs (RFOUTA±/RFOUTB±) with independent power control.

Technical Context

The ADF4355-2BCPZ-RL7 implements a fully integrated PLL architecture with a third-order fractional interpolator, dual-modulus prescaler (4/5 or 8/9), and on-chip VCO core operating from 3400 MHz to 6800 MHz. Its RF output stage supports two differential outputs with programmable power levels and hardware/software-controlled mute via PDBRF pin or register bit DB4/DB5.

It features separate analog (AVDD), digital (DVDD), RF (VRF), charge pump (VP), and VCO (VVCO) supply domains, with strict voltage matching requirements (AVDD = DVDD = VRF; VP = VVCO). Lock detection is provided via both analog and digital paths routed through the MUXOUT multiplexer.

Key Specifications

Pinout & Package

The ADF4355-2BCPZ-RL7 is housed in a 32-lead LFCSP (5 mm × 5 mm, 0.5 mm pitch) with exposed thermal pad requiring connection to AGND. Pin functions are validated per Analog Devices Rev. C datasheet Figure 3 and Table 4.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar wideband synthesizer applications.

Compared with HMC830LP6GE and ADF4371BCPZ, the ADF4355-2BCPZ-RL7 offers optimal balance of wideband coverage (54 MHz–4400 MHz), integrated ÷1/2/4/8/16/32/64 outputs, and proven deployment in wireless infrastructure-making it ideal for cost-sensitive, high-volume base station and microwave link designs where full 8 GHz range is unnecessary.

Availability

ADF4355-2BCPZ-RL7 is available at Aetrix Electronics and suitable for wireless infrastructure base stations, point-to-point microwave radios, and RF test equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for ADF4355-2BCPZ-RL7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices is a global leader in high-performance analog, mixed-signal, and RF ICs, serving communications, industrial, and instrumentation markets with precision signal processing solutions.

The ADF4355-2BCPZ-RL7 belongs to Analog Devices' ADF435x family of integrated wideband synthesizers, designed specifically for wireless infrastructure, microwave backhaul, and test equipment demanding low phase noise, wide frequency coverage, and flexible output configuration.

FAQ

What is the minimum RF output frequency supported by the ADF4355-2BCPZ-RL7?

The ADF4355-2BCPZ-RL7 supports an RF output frequency as low as 53.125 MHz, achieved by dividing its 3400–6800 MHz fundamental VCO output using the programmable ÷64 divider. This enables direct synthesis in VHF and UHF bands without external frequency translation stages, making the ADF4355-2BCPZ-RL7 suitable for legacy wireless standards and broadband instrumentation.

Does the ADF4355-2BCPZ-RL7 require external loop filter components?

Yes, the ADF4355-2BCPZ-RL7 requires an external passive loop filter between CPOUT and VTUNE to stabilize the PLL. The charge pump output (CPOUT) drives this filter, whose transfer function determines loop bandwidth, phase margin, and transient response. Analog Devices provides ADIsimPLL design tool support and reference schematics for optimizing filter topology based on target PFD frequency and VCO gain.

How is RF output power controlled on the ADF4355-2BCPZ-RL7?

RF output power on the ADF4355-2BCPZ-RL7 is controlled via register bits DB4 and DB5 in Register 6, selecting one of four programmable power levels (16/20/42/55 mA per output stage). Power varies from 8 dBm at 1 GHz to 3 dBm at 4.4 GHz, with ±1 dB variation over temperature and ±3 dB variation across the full frequency band - all verified on the EV-ADF4355-2SD1Z evaluation board.

Can the ADF4355-2BCPZ-RL7 generate two independent frequencies simultaneously?

Yes, the ADF4355-2BCPZ-RL7 can generate two independent frequencies simultaneously using its dual differential RF outputs: RFOUTA± and RFOUTB±. Each output pair has independent division ratio selection (÷1/2/4/8/16/32/64) and programmable power level, enabling concurrent LO generation for I/Q upconversion or dual-band operation without external splitters or synthesizers.

What is the purpose of the MUXOUT pin on the ADF4355-2BCPZ-RL7?

The MUXOUT pin on the ADF4355-2BCPZ-RL7 is a configurable diagnostic output that can route any of four internal signals: digital lock detect, analog lock detect, scaled RF output, or scaled reference frequency. This allows real-time PLL status monitoring, loop performance validation, or synchronization with external logic - all without requiring additional test equipment or probing sensitive RF nodes.