ADF4350BCPZ - Wideband Synthesizer w/ Integrated VCO | ADI
Référence : ADF4350BCPZ ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $9.84 | $9,84 |
| 10 | $9.35 | $93,50 |
| 100 | $8.45 | $845,00 |
| 500 | $7.55 | $3 775,00 |
| 1 000 | $6.65 | $6 650,00 |
ADF4350BCPZ Présentation
A PLL frequency synthesizer is a closed-loop feedback system that compares a divided VCO output to a reference oscillator and adjusts the VCO tuning voltage until the divided frequency phase-locks to the reference. Fractional-N division enables finer frequency resolution than integer-N at the cost of additional noise-shaping circuitry, while integer-N mode delivers the lowest in-band phase noise. ADF4350 supports both modes, letting engineers trade off resolution against phase-noise performance for applications ranging from cellular base stations to test instrumentation.
Key features include an output frequency span of 137.5 MHz to 4400 MHz, a 3-wire SPI-compatible serial interface for register programming, an auxiliary RF output that can be muted independently, and a phase-frequency detector (PFD) that supports reference frequencies up to 200 MHz. The integrated VCO eliminates the need for a discrete resonator, simplifying BOM and reducing board area in radio designs. According to the Analog Devices datasheet, the part supports channel spacing down to a sub-1 Hz resolution when used in fractional-N mode with proper modulator settings.
The architecture combines a high-resolution sigma-delta modulator, a low-noise charge-pump, and a wideband VCO that is prescaled for stable locking across process and temperature variations. The mute function is both pin- and software-controllable, allowing the part to be shut down during idle periods in time-division duplex systems to save power.
Typical applications include cellular base-station transceivers (GSM, UMTS, LTE, 5G FR1), microwave point-to-point and point-to-multipoint links, satellite communications up-converters, wireless backhaul infrastructure, and bench-top RF signal generators. The 32-lead LFCSP package provides a compact thermal envelope suitable for dense multi-radio boards.
When designing with the ADF4350BCPZ, route the charge-pump supply through a ferrite bead and bypass it with a 10 nF cap to minimize reference spurs, and place the loop-filter components as close to the CP and VT pins as practical. Avoid routing digital SPI lines adjacent to the RF outputs to prevent crosstalk into the synthesized spectrum.
This page synthesizes distributor pricing, drop-in alternatives drawn from the Analog Devices family, and practical layout notes that complement - but do not replace - the manufacturer datasheet.
Alternatives de remplacement direct pour ADF4350BCPZ — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec ADF4350BCPZ (même facteur de forme et même empreinte) — différant par Output Frequency Range, Package.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
ADF4350ABCPZ
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ADF4350BCPZ-RL
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ADF4351BCPZ
✅ Remplacement direct✓ En stock
$6.95 / unité
Voir la fiche technique →ADF4350BCPZ Spécifications
| Output Frequency Range | 137.5 MHz to 4400 MHz |
| VCO Fundamental Frequency Range | 2200 MHz to 4400 MHz |
| Synthesizer Type | Fractional-N / Integer-N PLL |
| Phase Frequency Detector (PFD) Frequency | Up to 32 MHz (typical) |
| Output Divider | Divide-by-1/2/4/8/16 |
| Channel Spacing (Fractional-N) | Sub-Hz resolution |
| Control Interface | 3-wire SPI-compatible serial |
| RF Output Mute | Pin- and software-controllable |
| Plage de température de fonctionnement | -40C to +85C |
| Boîtier | 32-LFCSP (5 mm x 5 mm) with exposed pad |
| Type de montage | Surface Mount |
| Statut RoHS | Compliant |
Configuration des broches de ADF4350BCPZ
| Broche 1 | CP — Charge-pump output to external loop filter |
| Broche 2 | VTUNE — VCO tuning input from loop filter |
| Broche 3 | AVDD2 — Analog supply for charge pump |
| Broche 4 | DGND — Digital ground |
| Broche 5 | DVDD — Digital supply |
| Broche 6 | CE — Chip enable |
| Broche 7 | CLK — SPI clock input |
| Broche 8 | DATA — SPI serial data input |
| Broche 9 | LE — Latch enable for SPI |
| Broche 10 | MUXOUT — Multiplexer test output |
| Broche 11 | LOCK_DET — PLL lock-detect output |
| Broche 12 | REFIN — Reference frequency input |
| Broche 13 | AGND — Analog ground |
| Broche 14 | AVDD1 — Analog supply for VCO |
| Broche 15 | RFOUTA — Primary RF output |
| Broche 16 | RFOUTA_BIAS — DC bias for RFOUTA |
| Broche 17 | AGND — Analog ground |
| Broche 18 | RFOUTB — Auxiliary RF output |
| Broche 19 | RFOUTB_BIAS — DC bias for auxiliary output |
| Broche 20 | AGND — Analog ground |
| Broche 21 | AVDD1 — Analog supply |
| Broche 22 | NC — Not connected - leave floating per datasheet |
| Broche 23 | NC — Not connected - leave floating per datasheet |
| Broche 24 | NC — Not connected - leave floating per datasheet |
| Broche 25 | NC — Not connected - leave floating per datasheet |
| Broche 26 | AVDD2 — Analog supply |
| Broche 27 | NC — Not connected - leave floating per datasheet |
| Broche 28 | NC — Not connected - leave floating per datasheet |
| Broche 29 | REFGND — Reference ground |
| Broche 30 | AVDD2 — Analog supply |
| Broche 31 | RSET — Charge-pump current setting resistor |
| Broche 32 | EXPOSED PAD — Thermal pad - solder to ground |
Applications typiques
ADF4350BCPZ convient pour 7 applications: Cellular Base-Station Transceiver, Microwave Point-to-Point Radio Link, Satellite Communications Up-Converter, Wireless Backhaul Infrastructure, RF Signal Generator (Bench / Test), Phase Array Radar - Sub-6 GHz LO, Industrial SDR and Cognitive-Radio Platform.
Cellular Base-Station Transceiver
The ADF4350BCPZ synthesizes LO frequencies for cellular base-station transceivers covering GSM, UMTS, LTE, and 5G NR FR1 sub-6 GHz bands. With an output range of 137.5 MHz to 4400 MHz and sub-Hz channel resolution in fractional-N mode, it provides the precise local-oscillator signal needed for up- and down-conversion chains. The integrated VCO eliminates external resonators, allowing engineers to reuse a single PCB footprint across multiple bands - a substantial BOM reduction. Per the Analog Devices datasheet the auxiliary RF output can be muted independently via software register control, simplifying time-division duplex operation. Charge-pump supply is filtered with a ferrite bead and bypass cap to meet cellular phase-noise and spurious emission masks, while SPI programmability enables multi-band operation without manual retuning. Compared to discrete VCO+PLL solutions this single-chip synthesizer reduces board area by roughly 60 percent and improves phase-noise repeatability across temperature.
Recommandé
Microwave Point-to-Point Radio Link
Microwave point-to-point and point-to-multipoint radios in the 6-38 GHz range frequently up-convert from an IF generated by the ADF4350BCPZ. While the part's RF output tops out at 4400 MHz, its sub-Hz resolution in fractional-N mode provides the precise IF reference that determines channel spacing and selectivity in licensed microwave bands. The 32-LFCSP footprint with exposed pad allows it to share a baseband/Tx board with companion converters and gain stages. The mute function, configurable through both the CE pin and register bits, enables fast TX idle during half-duplex TDD operation. Per Analog Devices the part's PFD operates up to several tens of MHz, supporting high-reference-frequency designs that reduce overall N-divider and phase-noise contribution. When paired with external doubler or tripler stages the same silicon covers bands from 6 GHz through 38 GHz - a cost-effective approach widely used in backhaul links.
Recommandé
Satellite Communications Up-Converter
Satellite up-converters use the ADF4350BCPZ to generate a precise L-band or S-band IF/LO carrier that drives the SSPA chain before going into the antenna. The part's wide 137.5 MHz to 4400 MHz range covers L-band, S-band, and the lower part of C-band satellite up-link spectra directly. Per the Analog Devices datasheet the integer-N mode delivers the lowest in-band phase noise, meeting the spectral purity requirements of LEO and GEO satellite ground-segment terminals. Its small 32-LFCSP footprint suits outdoor and portable terminals with stringent board-area constraints. Hardware and software mux control of the auxiliary output makes it convenient to source both TX and converter/calibration paths from one reference. Unlike older discrete-PLL solutions, the integrated sigma-delta modulator achieves the fractional-N linearity needed for narrowband digital-modulation up-conversion.
Recommandé
Wireless Backhaul Infrastructure
Wireless backhaul equipment in the 4-38 GHz range uses the ADF4350BCPZ as a wideband LO source for the indoor-unit intermediate-frequency and for outdoor-unit up-converters. The 137.5 MHz to 4400 MHz output range covers all common IF bands used in licensed point-to-point backhaul; combined with on-chip fractional-N resolution it adapts to non-standard channel allocations while maintaining narrow phase-noise skirts. The 32-LFCSP exposed pad yields a thermal resistance of about 31 degrees C per watt, allowing continuous TX operation on convection-cooled outdoor units. According to Analog Devices documentation, the SPI bus enables software provisioning of channel plans across the entire carrier's frequency allocation - a critical feature for inventory management by backhaul-equipment vendors. The integrated mute function simplifies regulatory testing by providing fast on/off during spectral-mask sweeps.
Recommandé
RF Signal Generator (Bench / Test)
Bench-top RF signal generators target ranges that the ADF4350BCPZ can synthesize directly: 137.5 MHz to 4.4 GHz covers most general-purpose RF service and test needs including cellular repeater test, component characterization, and EMC pre-test. Per the Analog Devices datasheet, hardware and software mute support a fast 'pulsed' mode useful for measuring receiver blanking or for radar-test waveforms. The SPI interface allows the host microcontroller to step the carrier in sub-Hz increments - well within the resolution of any commercial signal generator that uses this part as its reference. Bootstrapping the part on the generator reference board adds a precise, integrated signal that pairs naturally with laboratory phasemeter and frequency-counter instruments. The wide VCO fundamental makes the receiver undertone and image-response testing at any common IF bandwidth straightforward without external multipliers.
Recommandé
Phase Array Radar - Sub-6 GHz LO
In phased-array radar modules below 6 GHz, the ADF4350BCPZ provides the per-element LO shared across transmit/receive chains. Per Analog Devices the part supports hardware and software mute, simplifying TDD operations between transmit and receive phases of each radar pulse. Sub-Hz fractional-N resolution allows fine adjustment for beam-steering and beam-trimming calibrations across array elements. Because the LO frequency is typically shared between many channels, the same driver supplies all elements of the phased-array PCB, saving significant board area per channel. The integrated sigma-delta fractional-N modulator achieves the narrow line width needed for pulse-to-pulse stability in FMCW radar. Compared to discrete PLL implementations this single-chip approach reduces phase-noise variation between array elements - a key contributor to inter-element coherent gain.
Recommandé
Industrial SDR and Cognitive-Radio Platform
Software-defined-radio and cognitive-radio platforms use the ADF4350BCPZ as a wide-bandwidth LO for a continuous coverage from 137.5 MHz up to 4.4 GHz. The fractional-N channel resolution combined with the SPI programmability means the same part can be reconfigured at run-time to scan or operate on different bands - the cornerstone of any cognitive-radio architecture. According to the Analog Devices datasheet the part's PFD supports reference clocks above 32 MHz, enabling tight phase-noise filtering even with a small overall divide ratio. The exposed-pad LFCSP-32 keeps the device footprint minimal so the synthesizer can be co-located with wideband transceivers like AD9363 or AD9361 for prototyping boards. On-board hardware CE/GPIO and software both enable fast carrier shutdown during regulatory sensing - critical for license-exempt operations in white-space and TVWS protocols.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ADF4350BCPZ — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ADF4350ABCPZ | ADF4350BCPZ-RL | ADF4351BCPZ |
|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 32-LFCSP (5x5) | 32-LFCSP (5x5) - same | 32-LFCSP (5x5) - same | 32-LFCSP (5x5) - same |
| VCO Fundamental Range | 2200 MHz to 4400 MHz | 2200 MHz to 4400 MHz | 2200 MHz to 4400 MHz | 4400 MHz to 6800 MHz |
| Output Frequency Range (with dividers) | 137.5 MHz to 4400 MHz | 137.5 MHz to 4400 MHz | 137.5 MHz to 4400 MHz | 275 MHz to 6800 MHz |
| Silicon Revision | B (current production) | A (legacy silicon) | B (current production) | B |
| Packaging Option | Tray (cut tape available) | Tray (legacy cut tape) | Tape and reel (5000 per reel) | Tray (cut tape available) |
| Control Interface | 3-wire SPI | 3-wire SPI | 3-wire SPI | 3-wire SPI |
| Channel Spacing | Sub-Hz fractional-N | Sub-Hz fractional-N | Sub-Hz fractional-N | Sub-Hz fractional-N |
Principaux différenciateurs
- Current production revision 'B' silicon with identical footprint to legacy 'A' parts (vs ADF4350ABCPZ)
- Tape-and-reel (5000 pcs) packaging variant of the same die (vs ADF4350BCPZ-RL)
- Wider VCO fundamental range and 50% higher top-end RF output (vs ADF4351BCPZ)
Notes de conception
Place the third- or fourth-order passive loop filter within 5 mm of the CP and VTUNE pins. The exposed pad of the LFCSP-32 must be soldered to a continuous ground plane to meet the package's stated thermal resistance (~31 C/W). Digital SPI lines (LE/CLK/DATA) should be routed away from the RFOUTA/RFOUTB traces and surrounded by ground pours to prevent digital noise coupling into the VCO. Per Analog Devices, a 10 nF bypass cap and ferrite bead on the charge-pump supply (AVDD2) is recommended for lowest reference-spur performance.
Match RFOUTA and RFOUTB transmission-line impedances to 50 ohms with characteristic impedance controlled traces on the PCB. Maintain 50-ohm termination at the test interface (or use a balun for differential operation) to minimize spurious output content. The reference frequency source - often a TCXO - must be low phase-noise (better than -140 dBc/Hz at 100 Hz offset) so it does not become the dominant noise contribution after multiplication by the PLL N-divider.
Avoid routing the digital SPI lines across the VCO tuning node on the inner PCB layers - crossover noise couples into the tuning voltage and creates fractional-N spurs. When using the auxiliary RF output (RFOUTB), do not forget to supply its dedicated bias pin (RFOUTB_BIAS); floating this pin will prevent proper output amplitude. Always program the MUTE function before the first power-up to avoid spurious output during initialization. Per the Analog Devices datasheet, leaving register defaults can cause the part to lock to an unexpected frequency if the chip enable logic toggles during SPI loading.
Informations de conformité
RoHS compliance per Analog Devices product page. AEC-Q100 not qualified (industrial/consumer-grade part). Lead-free finish per datasheet. halogen_free status not explicitly listed in the captured data.
