Analog Devices Inc. HMC699LP5ETR

Overview

HMC699LP5ETR from Analog Devices (formerly Hittite Microwave) is a 7 GHz integer-N frequency synthesizer IC with reversible-polarity phase-frequency detector (PFD), lock detect output, and open-collector PFD buffers for op-amp-based loop filter interfacing. It supports continuous division ratios N = 56–519 and non-continuous N = 16–54, operates from 160 MHz to 7000 MHz VCO input, delivers ultra-low SSB phase noise of –153 dBc/Hz @ 10 kHz offset (100 MHz ref), and targets high-performance PLL systems in satellite comms and military radios.

For engineers reviewing the HMC699LP5ETR datasheet, HMC699LP5ETR pinout, HMC699LP5ETR application, or HMC699LP5ETR equivalent, key selection considerations include its 7 GHz VCO input range, dual-mode integer-N division architecture, –153 dBc/Hz phase noise floor at 10 kHz, 5×5 mm 32-lead QFN package with exposed ground paddle, and compatibility with differential loop filters for fast settling and low spurs.

Technical Context

The HMC699LP5ETR implements an integer-N PLL architecture with a wideband reversible-polarity PFD and integrated A/S counter logic for programmable division. Its PFD operates up to 7 GHz input, supports both sine and square wave reference inputs (10–1300 MHz), and provides NU/ND open-collector outputs with 2000 mV_PP swing and 0.32 V/Rad gain.

It features two distinct division modes: continuous (N = 56–519, requiring A+1 ≥ S) and non-continuous (N = 16–54), enabling flexible frequency planning while maintaining low phase noise via high reference frequencies and wide loop bandwidths. The device requires external AC coupling on REF/NREF and FIN/NFIN pins and mandates RF grounding of the exposed paddle per Hittite's land pattern guidelines.

Key Specifications

Pinout & Package

32-lead 5×5 mm QFN package (HMC699LP5ETR) with exposed ground paddle requiring solder connection to PCB RF ground plane. RoHS-compliant matte tin finish, MSL1 rating, max reflow 260 °C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADF4159BCPZ and HMC703LP4E, the HMC699LP5ETR offers superior phase noise performance and dedicated A/S counter architecture for predictable integer-N behavior, making it optimal for fixed-frequency, low-spur radar and satcom LO generation where jitter and spectral purity are critical.

Availability

HMC699LP5ETR is available at Aetrix Electronics and suitable for satellite communication systems, point-to-point radios, military radar subsystems, and SONET/OTN clock generation requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for HMC699LP5ETR 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, emphasizing precision timing, microwave synthesis, and mmWave signal chain solutions.

The HMC699LP5ETR belongs to Hittite's legacy integer-N synthesizer family, designed specifically for low-phase-noise, wideband PLL applications in defense, aerospace, and optical transport infrastructure.

FAQ

What is the maximum VCO input frequency supported by the HMC699LP5ETR?

The HMC699LP5ETR supports a maximum VCO input frequency of 7000 MHz, verified in electrical specifications under TA = +25 °C and Vcc = 5 V. This enables direct synthesis in X-band without prescaling and is confirmed by functional testing up to 7 GHz with 0 dBm input power. The HMC699LP5ETR maintains specified phase noise and lock detection performance across this full range when used with appropriate AC coupling and impedance matching.

Does the HMC699LP5ETR support both sine and square wave reference inputs?

Yes, the HMC699LP5ETR accepts both sine and square wave reference inputs across its 10–1300 MHz range. Square wave input achieves better phase noise at lower reference frequencies (<100 MHz), while sine wave is preferred above 100 MHz per characterization data. The REF/NREF pins are AC-coupled and require external DC blocking capacitors, and input power must remain within –5 to +5 dBm at 100 MHz to meet specification limits.

How does the A+S counter architecture affect programming of the HMC699LP5ETR?

The HMC699LP5ETR uses a dual-modulus A/S counter structure where N = 8(A+1) + S. For continuous division ratios (N = 56–519), the condition A+1 ≥ S must hold; violation results in non-continuous behavior (N = 16–54). Programming requires setting six N bits (N0–N5), two S bits (S0–S1), and one INV bit - all CMOS-compatible with VIH ≥ 1.8 V and VIL ≤ 1.1 V. Truth tables in the datasheet define valid combinations.

What is the purpose of the exposed ground paddle on the HMC699LP5ETR package?

The exposed ground paddle on the HMC699LP5ETR serves dual thermal and RF grounding functions. It must be soldered to the PCB's main ground plane using ≥6 thermal vias to achieve the specified 11.6 °C/W junction-to-ground thermal resistance and maintain phase noise integrity. Per Hittite Application Note, failure to connect the paddle degrades EMI performance, increases junction temperature beyond 135 °C absolute max, and risks lock instability due to ground bounce on NU/ND outputs.

Can the HMC699LP5ETR be used with a passive loop filter?

No, the HMC699LP5ETR requires an active loop filter due to its open-collector NU/ND outputs, which need external pull-up resistors and op-amp integration. Passive filters cannot interface directly with these outputs. The datasheet explicitly specifies use with "differential loop filter" and "op-amp based loop filter", and evaluation board schematics confirm active integrator topology with LMH6629-grade amplifiers. Attempting passive filtering results in undefined PFD voltage levels and loss of lock.