Analog Devices Inc. HMC702LP6CETR

Overview

HMC702LP6CETR from Analog Devices (formerly Hittite Microwave) is a SiGe BiCMOS fractional-N phase-locked loop synthesizer designed for high-frequency RF signal generation in microwave systems. It features a 14 GHz 16-bit RF N-divider, 24-bit delta-sigma modulator, ultra-low phase noise (−98 dBc/Hz @ 20 kHz offset, fractional mode), and supports both fractional and integer-N operation with 6 Hz typical frequency step resolution.

For engineers reviewing the HMC702LP6CETR datasheet, HMC702LP6CETR pinout, HMC702LP6CETR application, or HMC702LP6CETR equivalent, key selection considerations include its 14 GHz max RF input capability, integrated cycle slip prevention for fast settling, reference spurs < −90 dBc typ, and support for dual reference inputs (square wave and sinusoidal) up to 250 MHz.

Technical Context

The HMC702LP6CETR implements a fixed divide-by-2 followed by an 8 GHz 16-bit RF N-divider and a 24-bit delta-sigma modulator, enabling fine frequency resolution down to 6 Hz. Its digital phase-frequency detector (PFD) supports programmable gain and cycle-slip prevention, reducing frequency hop time by ~50% versus conventional PFDs.

It integrates dual reference path buffers (XREFP for square wave, XSIN for sine), a 14-bit R-divider (1–16,383), and auxiliary clock generation via GPO pins. The device operates with separate +3.3 V analog/digital supplies and +5 V analog charge pump/phase detector supplies, and includes on-chip temperature sensing (±10 °C accuracy).

Key Specifications

Pinout & Package

40-pin, 6 × 6 mm QFN package with exposed thermal paddle (36 mm² footprint); RoHS-compliant, reflow-compatible (260 °C peak).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADF4371BCPZ and LMS8001-Q48, the HMC702LP6CETR delivers superior RF frequency reach (14 GHz), hardware-level sweep control, and real-time prescaler monitoring - making it optimal for demanding radar and test instrumentation where deterministic analog performance is non-negotiable.

Availability

HMC702LP6CETR is available at Aetrix Electronics and suitable for automotive radar, FMCW sensors, phased-array communication systems, and 5G test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for HMC702LP6CETR 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 portfolio, specializing in precision analog, RF, and microwave ICs for defense, communications, and instrumentation markets.

The HMC702LP6CETR belongs to the Hittite PLL family engineered for ultra-low phase noise and fast-settling frequency synthesis in microwave infrastructure - targeting applications where spectral purity and timing determinism directly impact system-level SNR and resolution.

FAQ

What is the maximum RF input frequency supported by the HMC702LP6CETR?

The HMC702LP6CETR supports a maximum RF input frequency of 14 GHz at 3.3 V supply, verified per Table 1 Prescaler Characteristics. This enables direct interfacing with Ku-band VCOs without external prescaling, preserving phase noise integrity and simplifying signal chain design in radar and test equipment applications where the HMC702LP6CETR serves as the primary frequency synthesis engine.

Does the HMC702LP6CETR support both fractional-N and integer-N modes?

Yes, the HMC702LP6CETR operates in both fractional-N and integer-N modes, with confirmed specifications including −98 dBc/Hz phase noise @ 20 kHz offset in fractional mode and −103 dBc/Hz in integer mode (12 GHz VCO, 50 MHz reference). Mode selection is controlled via register configuration, and the device's 24-bit delta-sigma modulator enables 6 Hz typical frequency step resolution in fractional mode - a key capability documented in the HMC702LP6CETR datasheet.

How does the Cycle Slip Prevention (CSP) feature improve performance in the HMC702LP6CETR?

The Cycle Slip Prevention (CSP) feature in the HMC702LP6CETR reduces frequency settling time by approximately 50% compared to conventional PFDs by dynamically adjusting PFD gain and preventing erroneous phase comparisons during large frequency hops. This is validated in the "Cycle Slip Prevention" plot (Page 6), where CSP ON achieves sub-microsecond lock from 5200 MHz to 3950 MHz - critical for FMCW radar and agile test equipment relying on the HMC702LP6CETR for rapid, deterministic frequency transitions.

What are the reference input options for the HMC702LP6CETR?

The HMC702LP6CETR provides two dedicated reference input paths: XREFP accepts square-wave inputs (CML/CMOS) up to 250 MHz, while XSIN accepts sinusoidal 50 Ω inputs (0 dBm typical) with superior phase noise floor (≈−159 dBc/Hz). Only one path should be enabled per design; the sine path is recommended for lowest in-band phase noise, and configuration is done via registers rfp_buf_sin_en and rfp_buf_sq_en - both options are fully specified and validated in the HMC702LP6CETR electrical characteristics tables.

Is the HMC702LP6CETR pin-compatible with other Hittite PLLs like the HMC703LP6CE?

No, the HMC702LP6CETR is not pin-compatible with the HMC703LP6CE. While both are 40-pin 6×6 mm QFN devices, their pin functions differ significantly: the HMC702LP6CETR uses pins 23–25 for GPO1–GPO3 with configurable modes, whereas the HMC703LP6CE assigns those pins to different control and diagnostic functions. Pin compatibility is not claimed in any official documentation for the HMC702LP6CETR, and layout reuse requires full schematic and footprint validation against the HMC702LP6CETR-specific pinout table (Page 5).