Analog Devices Inc. ADF4360-1BCP

Overview

ADF4360-1BCP from Analog Devices is an integrated integer-N PLL frequency synthesizer with on-chip VCO, designed for RF local oscillator generation in 2.05–2.45 GHz systems. It features a programmable dual-modulus prescaler (8/9, 16/17, 32/33), 3-wire serial interface, analog/digital lock detect, and divide-by-2 output option enabling 1.025–1.225 GHz operation. Used in GSM/PCS/WCDMA handsets and wireless LANs.

For engineers reviewing the ADF4360-1BCP datasheet, ADF4360-1BCP pinout, ADF4360-1BCP application, or ADF4360-1BCP equivalent, key selection criteria include VCO tuning range (1.25–2.5 V), phase noise (−110 dBc/Hz @ 100 kHz offset), lock time (400 µs), output power programmability (−13 to −6 dBm), and 3.0–3.6 V supply compatibility with 1.8 V logic.

Technical Context

The ADF4360-1BCP implements an integer-N PLL architecture with a synchronous 4/5-core dual-modulus prescaler and 13-bit B / 5-bit A / 14-bit R counters. Its VCO employs eight overlapping frequency bands for wide-range coverage while maintaining stable KV (57 MHz/V nominal) and low phase noise.

Control is executed via a 24-bit shift register with latch-select control bits (C2/C1), supporting independent programming of R, N (A/B), and control registers. The charge pump delivers ±2.5 mA (typ) with 2% current matching and integrates lock detection with configurable digital/analog outputs via MUXOUT.

Key Specifications

Pinout & Package

Package: 24-lead LFCSP (4 mm × 4 mm, 0.5 mm pitch) with exposed thermal pad (EP) requiring connection 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 ADF4360-2BCP and ADF4360-7BCP, the ADF4360-1BCP provides optimal phase noise and lock time specifically at 2.25 GHz center frequency, with validated VCO tank component values and PCB layout guidelines for 2.05–2.45 GHz operation - making it the preferred choice for PCS/WCDMA infrastructure and handset designs.

Availability

ADF4360-1BCP is available at Aetrix Electronics and suitable for wireless handset transceivers, test equipment LO subsystems, wireless LAN front-ends, and CATV upconverter designs requiring stable component supply and long-term production continuity.

Supply support for ADF4360-1BCP 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 precision instrumentation, communications, and industrial markets since 1965.

The ADF4360 family is engineered for highly integrated, low-power RF synthesis in portable and infrastructure wireless systems - delivering single-chip PLL+VCO solutions with industry-leading phase noise and programmability.

FAQ

What is the recommended power-up sequence for the ADF4360-1BCP?

The ADF4360-1BCP requires strict register write order: first program the R counter latch, then the control latch, and finally the N counter latch. This sequence ensures correct VCO band selection during initialization. Skipping or reordering causes unstable lock behavior or failure to achieve target frequency. The ADF4360-1BCP datasheet specifies this in the Power-Up section (Page 16) and must be followed for reliable operation.

Does the ADF4360-1BCP support fractional-N operation?

No, the ADF4360-1BCP is strictly an integer-N synthesizer. It lacks a sigma-delta modulator or fractional divider, and all frequency resolution is determined by the reference input divided by the R counter value. The ADF4360-1BCP achieves fine resolution only through low fREFIN or high R division - unlike fractional-N parts such as the ADF4153A.

How does the Mute-Till-Lock Detect (MTLD) feature function in the ADF4360-1BCP?

When MTLD is enabled (MTLD bit = 1 in control latch), the ADF4360-1BCP disables the RF output stage until digital lock detect asserts. This prevents uncontrolled RF transmission during PLL acquisition. The ADF4360-1BCP resumes RF output only after three consecutive PFD cycles show phase error <15 ns - ensuring spectral purity before signal activation.

Can the ADF4360-1BCP operate with a 1.8 V reference clock input?

Yes, the ADF4360-1BCP supports 1.8 V logic levels on CLK, DATA, and LE inputs, as confirmed in Table 1 (VINH = 1.5 V min, VINL = 0.6 V max). However, REFIN is CMOS-compatible with threshold at VDD/2 and requires ≥0.7 V_p-p swing - so a 1.8 V swing is acceptable but a 1.8 V DC-coupled square wave must meet slew rate >21 V/µs per datasheet specification.

What is the purpose of the RSET pin on the ADF4360-1BCP?

The RSET pin on the ADF4360-1BCP sets the maximum charge pump current (ICP) using an external resistor to CPGND. With RSET = 4.7 kΩ, the ADF4360-1BCP delivers 2.5 mA (typ) ICP. The relationship is ICP_max = 11.75 / RSET (kΩ); changing RSET directly scales loop filter gain and affects lock time, stability, and phase noise - requiring full loop compensation recalculation.