Analog Devices Inc. ADF4355-3BCPZ-RL7

Overview

ADF4355-3BCPZ-RL7 from Analog Devices is a microwave wideband fractional-N/integer-N PLL frequency synthesizer with integrated VCO, supporting RF output from 51.5625 MHz to 6600 MHz. It features 38-bit frequency resolution, programmable output division (÷1/2/4/8/16/32/64), 3.3 V single-supply operation, and 1.8 V logic compatibility. Used in wireless infrastructure base stations for W-CDMA and WiMAX carrier generation.

For engineers reviewing the ADF4355-3BCPZ-RL7 datasheet, ADF4355-3BCPZ-RL7 pinout, ADF4355-3BCPZ-RL7 application, or ADF4355-3BCPZ-RL7 equivalent, key selection criteria include VCO fundamental range (3300–6600 MHz), normalized in-band phase noise floor (−223 dBc/Hz integer mode), integrated RMS jitter (200 fs), RF output mute capability, and 3-wire SPI interface timing compliance up to 50 MHz.

Technical Context

The ADF4355-3BCPZ-RL7 implements a third-order fractional interpolator with dual-modulus prescaler (4/5 or 8/9) and supports both analog and digital lock detection. Its RF N-divider uses INT/FRAC1/FRAC2/MOD2 registers to achieve sub-Hz frequency resolution without residual error.

Phase noise performance is optimized via programmable charge pump current (0.3–4.8 mA), VCO sensitivity (63 MHz/V), and independent power domains: AVDD/DVDD/VRF/VP/VVCO all at 3.3 V ±4.5%, with dedicated ground pins (AGND, CPGND, AGNDVCO, AGNDRF, SDGND) to minimize coupling.

Key Specifications

Pinout & Package

ADF4355-3BCPZ-RL7 uses a 32-lead 5 mm × 5 mm LFCSP package with exposed thermal pad (EP), RoHS-compliant and moisture-sensitive level 3. Pin mapping follows standard Analog Devices BCPZ layout with dedicated analog/digital/VCO/RF ground returns.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADF4355-2BCPZ-RL7, the ADF4355-3BCPZ-RL7 extends usable RF bandwidth by 50% (to 6600 MHz) at the cost of higher VCO current (52–70 mA vs. 45–65 mA); versus LMS7002M, it delivers superior phase noise and frequency agility but requires external signal chain components.

Availability

ADF4355-3BCPZ-RL7 is available at Aetrix Electronics and suitable for wireless infrastructure, point-to-point microwave links, and test equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for ADF4355-3BCPZ-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 precision instrumentation, communications, and industrial markets since 1965.

The ADF4355-3BCPZ-RL7 belongs to Analog Devices' ADF435x family of wideband PLL synthesizers designed specifically for microwave and millimeter-wave signal generation in infrastructure and instrumentation applications.

FAQ

What is the maximum RF output frequency supported by the ADF4355-3BCPZ-RL7?

The ADF4355-3BCPZ-RL7 supports an RF output frequency range of 51.5625 MHz to 6600 MHz. This upper limit is achieved using the fundamental VCO output (3300–6600 MHz) without division. The device achieves full coverage via on-chip ÷1/2/4/8/16/32/64 dividers, making the ADF4355-3BCPZ-RL7 suitable for Ka-band applications up to 6.6 GHz.

Does the ADF4355-3BCPZ-RL7 require external loop filter components?

Yes, the ADF4355-3BCPZ-RL7 requires an external passive loop filter between CPOUT and VTUNE to stabilize the PLL. The charge pump output (CPOUT) drives this filter, whose design depends on target loop bandwidth, phase margin, and reference spur suppression. Analog Devices provides ADIsimPLL™ for automated filter synthesis and performance prediction specific to the ADF4355-3BCPZ-RL7.

Can the ADF4355-3BCPZ-RL7 generate two independent RF outputs simultaneously?

Yes, the ADF4355-3BCPZ-RL7 provides two fully independent differential RF outputs: RFOUTA± and RFOUTB±. Each output stage is programmable for power level and can be muted separately via PDBRF pin or register control. This enables concurrent generation of distinct LO signals - for example, one for upconversion and another for downconversion - without external splitters or amplifiers.

What is the significance of the −223 dBc/Hz normalized phase noise floor specification for the ADF4355-3BCPZ-RL7?

The −223 dBc/Hz value is the normalized in-band phase noise floor for integer-N operation. It serves as the baseline for calculating actual in-band phase noise using the formula: −223 + 10log(fPFD) + 20logN. This metric directly impacts EVM in modulated systems and reciprocal mixing in receivers. The ADF4355-3BCPZ-RL7 achieves this performance via optimized charge pump matching and low-noise VCO core design.

How does the ADF4355-3BCPZ-RL7 handle reference input signals?

The ADF4355-3BCPZ-RL7 accepts both single-ended (REFINA only, biased at AVDD/2) and differential (REFINA/REFINB, biased at 2.1 V) reference inputs up to 600 MHz. Input mode is selected via Register 4 Bit DB9. Internal ECL-to-CMOS conversion ensures robust clock recovery, and the reference doubler (enabled in Register 4 Bit DB26) extends low-frequency support to 100 MHz with doubled input.