Analog Devices Inc. ADF4360-6BCP

Overview

ADF4360-6BCP from Analog Devices is an integrated integer-N PLL frequency synthesizer with on-chip VCO, designed for RF local oscillator generation at 1150 MHz center frequency (1050–1250 MHz) or 525–625 MHz when divide-by-2 is enabled. It features 3-wire serial interface, programmable output power (−13.5 to −4.5 dBm), analog/digital lock detect, and operates from 3.0 V to 3.6 V supply. Used in GSM/PCS/WCDMA handset LO circuits.

For engineers reviewing the ADF4360-6BCP datasheet, ADF4360-6BCP pinout, ADF4360-6BCP application, or ADF4360-6BCP equivalent, key selection considerations include VCO tuning range (1.25–2.5 V), phase noise (−110 dBc/Hz @ 100 kHz offset), lock time (400 µs), dual-modulus prescaler options (8/9, 16/17, 32/33), and 24-pin LFCSP package compatibility with RF layout constraints.

Technical Context

The ADF4360-6BCP implements a fully integrated PLL architecture with a 13-bit B counter, 5-bit A counter, and 14-bit R counter driving a dual-modulus prescaler (8/9, 16/17, or 32/33). Its VCO uses eight overlapping frequency bands with automatic band selection logic triggered by N-counter updates.

Phase detection employs a programmable PFD with antibacklash pulse control (ABP1/ABP2 bits), while charge pump current (ICP) is set via external RSET resistor (2.7–10 kΩ) and digitally configurable across eight levels (0.31–2.5 mA). Output stage supports differential RFOUTA/RFOUTB with programmable tail current (3.5–11 mA) and mute-till-lock detect (MTLD) functionality.

Key Specifications

Pinout & Package

ADF4360-6BCP is housed in a 24-lead, 4 mm × 4 mm, 0.8 mm pitch LFCSP (Lead Frame Chip Scale Package) with exposed thermal pad requiring connection to AGND. Pin 1 is CPGND; pins 3, 8–11, and 22 are AGND; pin 24 is CP; pin 0 (EP) is exposed pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADF4360-7BCP, the ADF4360-6BCP delivers superior phase noise at 1150 MHz due to optimized VCO core and band selection. Against LMX2531LQ1770E/NOPB, it offers simpler integer-N programming and identical 3-wire interface but lacks fractional division and consumes more current.

Availability

ADF4360-6BCP is available at Aetrix Electronics and suitable for wireless handset design, test instrumentation development, and CATV infrastructure projects requiring stable component supply and full lifecycle support.

Supply support for ADF4360-6BCP 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 digital signal processing semiconductors, headquartered in Norwood, MA.

The ADF4360 family targets RF system designers needing compact, low-cost, integrated PLL+VCO solutions for cellular, wireless, and broadband infrastructure applications.

FAQ

What is the maximum reference input frequency supported by the ADF4360-6BCP?

The ADF4360-6BCP supports a maximum REFIN frequency of 250 MHz under specified conditions. For inputs below 10 MHz, a dc-coupled CMOS-compatible square wave with slew rate >21 V/µs is required. The R counter allows division ratios from 1 to 16,383, enabling flexible PFD frequency selection across wide reference ranges.

How does the ADF4360-6BCP achieve low phase noise performance?

The ADF4360-6BCP achieves −110 dBc/Hz phase noise at 100 kHz offset through its 8-band VCO architecture, which maintains a stable KV of 32 MHz/V and minimizes sensitivity variation. Combined with programmable charge pump current and antibacklash pulse control in the PFD, it suppresses close-in noise and reference spurs-key for cellular receiver selectivity.

Can the ADF4360-6BCP operate with a 1.8 V digital interface supply?

Yes, the ADF4360-6BCP supports 1.8 V logic compatibility on all digital inputs (CLK, DATA, LE, CE, MUXOUT) with VINH ≥1.5 V and VINL ≤0.6 V. DVDD must still be 3.0–3.6 V, but level-shifting is unnecessary-simplifying interface with low-voltage baseband processors and FPGAs.

What is the function of the MUXOUT pin on the ADF4360-6BCP?

The MUXOUT pin on the ADF4360-6BCP is a programmable multiplexer output controlled by M3/M2/M1 bits in the function latch. It can be configured to output digital lock detect (active-high), analog lock detect (open-drain), R-divider output, N-divider output, or DVDD-enabling real-time status monitoring and debug without additional test points.

Does the ADF4360-6BCP require external loop filter components?

Yes, the ADF4360-6BCP requires an external passive loop filter connected between CP and VTUNE. The filter type (e.g., third-order passive) and component values depend on desired loop bandwidth, phase margin, and PFD frequency. CC (pin 12) and CN (pin 14) also require mandatory external capacitors (10 nF to AGND and 10 µF to VVCO) for internal compensation stability.