Analog Devices Inc. ADF4360-7BCP

Overview

ADF4360-7BCP from Analog Devices is an integrated integer-N PLL frequency synthesizer with on-chip VCO, designed for RF local oscillator generation in wireless transceivers. It delivers 350 MHz to 1800 MHz VCO output (or 175–900 MHz with ÷2), operates from 3.0 V to 3.6 V, supports 3-wire serial control, and features analog/digital lock detect - used in GSM/PCS/WCDMA handset LO synthesis.

For engineers reviewing the ADF4360-7BCP datasheet, ADF4360-7BCP pinout, ADF4360-7BCP application, or ADF4360-7BCP equivalent, key selection criteria include VCO tuning range (350–1800 MHz), programmable output power (−14 to −5 dBm), dual-modulus prescaler (8/9 or 16/17), phase noise performance (−116 dBc/Hz @ 100 kHz offset), and chip-scale package compatibility with RF layout constraints.

Technical Context

The ADF4360-7BCP implements an integer-N PLL architecture with a dual-modulus prescaler (8/9 or 16/17) enabling N = BP + A division, where B is a 13-bit counter and A is a 5-bit swallow counter. Its VCO core uses eight overlapping frequency bands automatically selected via band-select logic synchronized to the R counter clock.

Control is executed via a 24-bit serial interface with MSB-first loading and latch selection using two control bits (C2/C1). The charge pump current (ICP) is set by an external RSET resistor (nominal 4.7 kΩ → 2.5 mA), and loop filter design must accommodate VTUNE voltage range (1.25–2.5 V) and VCO sensitivity (12 MHz/V typical at 13 nH).

Key Specifications

Pinout & Package

ADF4360-7BCP is housed in a 24-lead chip-scale package (CSP) with exposed thermal pad (EP), requiring soldering of EP to AGND for thermal and electrical integrity. Pin pitch is 0.5 mm; package dimensions are 4.0 mm × 4.0 mm × 0.8 mm (max).

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, ADF4350BRUZ offers broader bandwidth and fractional-N agility at the cost of higher current draw and larger footprint, while LMX2531LQ1770E trades VCO flexibility and ÷2 functionality for lower quiescent power and integrated regulation - making ADF4360-7BCP optimal for cost-sensitive, mid-band RF designs requiring external tuning control.

Availability

ADF4360-7BCP is available at Aetrix Electronics and suitable for wireless handset LO synthesis, test equipment signal generation, wireless LAN infrastructure, and CATV upconverter applications requiring stable component supply and consistent RF performance across temperature.

Supply support for ADF4360-7BCP 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, headquartered in Norwood, MA, with deep expertise in precision signal processing and wireless infrastructure solutions.

The ADF4360 family targets cost-effective, integrated PLL+VCO solutions for consumer and industrial wireless applications - emphasizing simplicity, external component reduction, and robust RF performance in compact CSP packages.

FAQ

What is the recommended inductor value for ADF4360-7BCP to achieve 900 MHz VCO output?

The ADF4360-7BCP achieves 900 MHz VCO output with L1 and L2 = 13 nH (typical), per the "Choosing the Correct Inductance Value" section of the datasheet. For this configuration, VCO sensitivity is ~12 MHz/V, and output power is programmable from −14 dBm to −5 dBm. A 470 Ω resistor must be placed in parallel with each inductor to AGND when inductance exceeds 3.3 nH. Always verify tuning curve linearity and phase noise using the EV-ADF4360-7EB1Z evaluation board.

Does ADF4360-7BCP support fractional-N synthesis?

No, ADF4360-7BCP is strictly an integer-N synthesizer. Its N-divider consists of a 13-bit B counter and 5-bit A counter, forming N = BP + A with no fractional modulus capability. Channel spacing is therefore limited to f_REFIN/R, where R is programmable from 1 to 16,383. For fractional-N operation, consider Analog Devices' ADF4350 or ADF4351, which integrate sigma-delta modulators.

How is the charge pump current (ICP) set on ADF4360-7BCP?

ICP is set by an external resistor (RSET) connected between Pin 13 (RSET) and CPGND (Pin 1). With RSET = 4.7 kΩ, nominal ICP is 2.5 mA (sink/source), calculated as I_CP = 11.75 / R_SET (kΩ). The RSET range is 2.7 kΩ to 10 kΩ, yielding ICP from ~1.17 mA to ~4.35 mA. This current directly scales loop filter gain and affects lock time, stability, and reference spur levels.

Can ADF4360-7BCP generate both RFOUTA and RFOUTB simultaneously?

Yes, ADF4360-7BCP drives RFOUTA and RFOUTB differentially from the same VCO core, and both outputs are active simultaneously. They are complementary (180° out-of-phase) and share identical programmable output power levels (−14 to −5 dBm). This enables balanced mixer drive or single-ended use with one output terminated in 50 Ω while the other feeds the RF path - no internal switching or disable function is provided.

What is the purpose of the MUXOUT pin on ADF4360-7BCP?

MUXOUT (Pin 20) is a multiplexed output that can be configured via M3/M2/M1 bits in the function latch to monitor internal signals: digital lock detect, analog lock detect, scaled RF output (÷2 or ÷4), or scaled reference frequency (÷R). This enables real-time PLL status verification, debug of lock behavior, or injection of a clean reference into auxiliary circuitry - all without requiring additional test points or probes.