Analog Devices Inc. HMC702LP6CE

Overview

HMC702LP6CE from Analog Devices (formerly Hittite Microwave) is a SiGe BiCMOS fractional-N phase-locked loop synthesizer with dual optimized reference inputs, 14 GHz RF input capability, 16-bit N-divider, 24-bit delta-sigma modulator, and ultra-low in-band phase noise. It serves as the core frequency synthesis engine in high-performance radar and wireless test equipment.

For engineers reviewing the HMC702LP6CE datasheet, HMC702LP6CE pinout, HMC702LP6CE application, or HMC702LP6CE equivalent, this page delivers verified specifications, validated pin functions, confirmed alternative options for 14 GHz PLL design, and real-world use context for automotive radar, phased-array systems, and communications test instrumentation.

Technical Context

The HMC702LP6CE integrates a fixed divide-by-2 prescaler followed by a 16-bit RF N-divider operating up to 14 GHz, a 24-bit delta-sigma modulator enabling 6 Hz typical frequency step resolution, and a precision-controlled charge pump with programmable gain (125 µA–4 mA) and offset trimming. Its dual-reference architecture supports both 250 MHz square-wave (XREFP) and 250 MHz sinusoidal (XSIN) inputs, each with dedicated low-noise buffers.

It features cycle slip prevention (CSP) logic that reduces frequency settling time by 50% versus conventional PFDs, a built-in linear sweeper for chirp generation, and auxiliary clock modes accessible via GPO pins. Closed-loop phase noise reaches –98 dBc/Hz @ 10 kHz offset (12 GHz VCO, fractional mode, 50 MHz PFD).

Key Specifications

Pinout & Package

40-lead, 6 mm × 6 mm, 0.5 mm pitch QFN package with exposed thermal paddle (LP6CE). Pin 1 marked by dot; pins 10, 20, 21 are no-connect.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fractional-N PLL applications.

Compared with ADF4371BCPZ and HMC830LP6GE, the HMC702LP6CE uniquely combines 14 GHz operation, hardware CSP, dual-reference optimization, and on-chip sweeper-making it the only choice for demanding FMCW radar and wideband test equipment where settling speed, spur suppression, and reference flexibility are non-negotiable.

Availability

HMC702LP6CE is available at Aetrix Electronics and suitable for automotive radar, phased-array systems, and wireless test equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.

Supply support for HMC702LP6CE 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 acquired Hittite Microwave in 2014 and maintains its high-frequency RF product lines, including millimeter-wave PLLs, VCOs, and integrated transceivers.

The HMC702LP6CE belongs to Hittite's legacy high-performance PLL family designed specifically for defense, aerospace, and telecom infrastructure applications demanding ultra-low phase noise, fast settling, and robust spurious performance.

FAQ

What is the maximum RF input frequency supported by the HMC702LP6CE?

The HMC702LP6CE supports a maximum RF input frequency of 14 GHz at 3.3 V supply, as specified in the Prescaler Characteristics table under "Max RF Input Frequency (3.3V)". This enables direct interfacing with X-band VCOs without external prescaling. Operation above 12 GHz requires proper thermal management due to increased power dissipation in the RF section.

Does the HMC702LP6CE support both sinusoidal and square-wave reference inputs?

Yes, the HMC702LP6CE provides two dedicated reference inputs: XSIN (sinusoidal, optimized for lowest phase noise) and XREFP (square-wave, compatible with CML/CMOS levels). The datasheet confirms each path is independently buffered and optimized-users must select one and disable the other via register settings (rfp_buf_sin_en/rfp_buf_sq_en) to avoid noise coupling.

How does Cycle Slip Prevention (CSP) improve frequency settling in the HMC702LP6CE?

Cycle Slip Prevention in the HMC702LP6CE is implemented in hardware within the phase-frequency detector (PFD) and reduces frequency hop settling time by approximately 50% compared to conventional PFDs. This is achieved by dynamically adjusting PFD gain and preventing false lock states during large frequency transitions-critical for FMCW radar chirp agility and fast-hopping test equipment.

What is the function of the GPO pins (GPO1–GPO3) on the HMC702LP6CE?

The GPO pins (Pins 23–25) on the HMC702LP6CE provide configurable real-time waveform access via SPI register control (Reg1Bh). They can output prescaler clocks, lock detect windows, anti-cycle-slip strobes, ΔΣ modulator phase accumulators, or auxiliary oscillator signals-enabling debug visibility, multi-VCO synchronization, and chirp timing without external logic.

What power supply voltages are required for the HMC702LP6CE?

The HMC702LP6CE requires three distinct supply domains: analog +5 V (VCCOA, VPPCP, VPPDRV, VDDPD, VDDPDV, VDDPDR), analog +3.3 V (VCCHF, VCCPRS, RVDD), and digital +3.3 V (DVDD, DVDDIO, DVDDQ). Each domain has separate ground returns (GNDCP, GNDPD, etc.)-strict separation is mandatory to achieve specified phase noise and spur performance.