Analog Devices Inc. ADF4360-2BCPZ

Overview

ADF4360-2BCPZ from Analog Devices is an integrated integer-N PLL frequency synthesizer with on-chip VCO, designed for RF local oscillator generation in 1850–2170 MHz cellular bands. It delivers programmable RF output power (−13 to −6 dBm), operates from 3.0–3.6 V, supports 3-wire serial control, and includes analog/digital lock detect for closed-loop stability in wireless handset transceivers.

For engineers reviewing the ADF4360-2BCPZ datasheet, ADF4360-2BCPZ pinout, ADF4360-2BCPZ application, or ADF4360-2BCPZ equivalent, key selection criteria include its 2000 MHz center frequency, divide-by-2 option (925–1085 MHz), 57 MHz/V VCO sensitivity, −110 dBc/Hz phase noise at 100 kHz offset, and compatibility with GSM/PCS/WCDMA RF front-end architectures requiring low-spur, fast-lock LO synthesis.

Technical Context

The ADF4360-2BCPZ implements a fully integrated PLL architecture with dual-modulus prescaler (8/9, 16/17, 32/33), 13-bit B counter, 5-bit A counter, and 14-bit R counter to achieve N = BP + A division. Its VCO uses eight overlapping frequency bands with automatic band selection logic triggered by N latch updates, ensuring monotonic tuning across 1850–2170 MHz.

It features a charge pump with programmable ICP (up to 2.5 mA via RSET), mute-till-lock-detect (MTLD) circuitry that disables RF output stage until digital lock is confirmed, and MUXOUT multiplexer supporting lock detect, scaled RF, or scaled reference outputs - all controlled via 24-bit serial interface with LE-strobed latch selection.

Key Specifications

Pinout & Package

Package: 24-lead LFCSP (4 mm × 4 mm, 0.8 mm pitch) with exposed thermal pad (EP) connected to AGND per datasheet Figure 3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar integer-N synthesizer with integrated VCO applications.

Compared with ADF4360-2BCPZ, ADF4360-7BCPZ shifts usable bandwidth upward without divide-by-2 flexibility, while LMX2531LQ1770E/NOPB trades integration for fractional-N precision and lower current - making ADF4360-2BCPZ optimal for cost-sensitive, fixed-integer GSM/PCS LO designs where board space and component count are constrained.

Availability

ADF4360-2BCPZ is available at Aetrix Electronics and suitable for wireless handset transceivers, test equipment LO subsystems, and CATV upconverter designs requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for ADF4360-2BCPZ 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, Inc. is a global leader in high-performance analog, mixed-signal, and RF ICs, serving communications, industrial, automotive, and instrumentation markets since 1965.

The ADF4360 family was designed specifically for highly integrated, low-cost RF synthesizer solutions in portable wireless infrastructure and consumer handsets - emphasizing small footprint, low power, and robust lock detection for battery-operated systems.

FAQ

What is the recommended power-up sequence for ADF4360-2BCPZ?

The ADF4360-2BCPZ requires strict power-up sequencing: first program the R counter latch, then the control latch, and finally the N counter latch. This ensures correct VCO band selection and avoids tuning discontinuities. The device must be held in hardware power-down (CE = low) until all registers are loaded and VDD/AVDD/DVDD/VVCO stabilize at 3.3 V ±10%. Failure to follow this sequence may result in unstable lock or out-of-band oscillation.

Does ADF4360-2BCPZ support fractional-N synthesis?

No, ADF4360-2BCPZ is strictly an integer-N synthesizer. It lacks a sigma-delta modulator or fractional divider, so output frequency resolution is limited to fREFIN/R. For example, with a 10 MHz REFIN and R = 100, minimum step size is 100 kHz. Applications requiring sub-kHz resolution must use a different part such as the ADF4351 or LMX2531 series.

How does the mute-till-lock-detect (MTLD) feature function in ADF4360-2BCPZ?

In ADF4360-2BCPZ, MTLD disables the RF output stage (RFOUTA/RFOUTB) until digital lock detect confirms stable phase alignment - defined as three consecutive PFD cycles with phase error <15 ns (LDP = 0). This prevents uncontrolled RF emission during PLL acquisition and is controlled by the MTLD bit in the control latch. Once locked, RF output enables automatically; no software polling is needed.

Can ADF4360-2BCPZ operate with a 1.8 V REFIN signal?

Yes, ADF4360-2BCPZ accepts 1.8 V logic-level REFIN inputs because its digital inputs are 1.8 V compatible. The datasheet specifies VINH ≥ 1.5 V and VINL ≤ 0.6 V for CMOS-compatible operation, and REFIN has a nominal threshold of VDD/2. With DVDD = 3.3 V, a 1.8 V square wave satisfies these conditions and is commonly used to interface with low-voltage baseband processors without level translation.

What is the purpose of the RSET pin on ADF4360-2BCPZ?

The RSET pin on ADF4360-2BCPZ sets the maximum charge pump current (ICPmax) using an external resistor to CPGND. With RSET = 4.7 kΩ, ICPmax = 2.5 mA. The relationship is ICPmax = 11.75 / RSET (kΩ). This resistor directly scales loop filter gain and impacts PLL stability, lock time, and reference spur magnitude - making RSET a critical design element for optimizing closed-loop performance.