Analog Devices Inc. HMC767LP6CETR

Overview

HMC767LP6CETR from Analog Devices (formerly Hittite Microwave) is a fully integrated Fractional-N PLL frequency synthesizer with on-die VCO, operating from 8.45 GHz to 9.55 GHz. It delivers +12 dBm RF output power, supports both integer and fractional-N modes, achieves -107 dBc/Hz in-band phase noise at 10 kHz offset (integer mode), and features 24-bit frequency resolution (3 Hz typical step size). It is used in microwave radios requiring precise, low-noise local oscillators.

For engineers reviewing the HMC767LP6CETR datasheet, HMC767LP6CETR pinout, HMC767LP6CETR application, or HMC767LP6CETR equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, application-specific implementation guidance, and two confirmed alternative synthesizers with documented functional trade-offs.

Technical Context

The HMC767LP6CETR integrates a delta-sigma fractional-N synthesizer, high-linearity charge pump (0.02–2.5 mA gain), and a 6–13 V-tuned VCO with 150 MHz/V sensitivity at 6 V. Its architecture enables ultra-fine frequency resolution (3 Hz typ.) and low fractional spurs (-65 to -38 dBc) while maintaining fast settling (433 µs for 100 MHz step).

It supports dual reference input paths (DC–350 MHz), programmable RF/2 divider (16-bit, even-only above 4 GHz), external triggering (TRIG pin), and integrated frequency sweeping. All analog supplies are segregated (VCCVCO @ 5 V, RVDD/AVDD @ 3.3 V), and digital I/O operates at 3.3 V with CMOS-compatible thresholds (38–54% VDDIO).

Key Specifications

Pinout & Package

Package: 40-lead, 6 × 6 mm leadless QFN (RoHS-compliant, MSL3, exposed ground paddle). All GND pins (2–5, 7, 9–14, 22, 23, 26, 35) and the bottom paddle must be soldered to RF/DC ground per Hittite layout guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC767LP6CETR, HMC765LP6CE offers identical architecture at lower frequency but lacks 9 GHz coverage, while ADF4371BCPZ delivers broader band and enhanced diagnostics at the cost of non-pin-compatible packaging and higher BOM complexity.

Availability

HMC767LP6CETR is available at Aetrix Electronics and suitable for VSAT radio development, microwave point-to-point radio production, and FMCW radar prototyping requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for HMC767LP6CETR 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 microwave PLLs and VCOs, with focus on defense, aerospace, and communications infrastructure.

The HMC767LP6CETR belongs to Hittite's "PLLs with Integrated VCO" family, designed specifically for microwave radio and radar systems demanding low phase noise, fast settling, and integrated modulation capability without external VCO tuning components.

FAQ

What is the absolute maximum tuning voltage for the HMC767LP6CETR VCO?

The HMC767LP6CETR VCO tuning voltage (VTUNE, Pin 6) has an absolute maximum rating of +15 V. Exceeding this may cause permanent damage. The specified operational range is 2–13 V, with optimal phase noise and linearity achieved between 4–10 V. Always use a current-limited, low-noise voltage source and include series resistance to limit fault current if driving from a DAC or op-amp.

Does the HMC767LP6CETR support both integer and fractional-N synthesis modes simultaneously?

No, the HMC767LP6CETR operates in either integer or fractional-N mode per configuration - not simultaneously. Mode selection is controlled via register bits in the SPI interface. Integer mode delivers lower in-band spurs and simpler loop filter design; fractional-N enables fine resolution and avoids reference frequency limitations. Switching between modes requires full register reprogramming and PLL relock.

Can the HMC767LP6CETR RFOUT pin drive a 50 Ω load directly?

Yes, the HMC767LP6CETR RFOUT (Pin 38) is designed as a 50 Ω AC-coupled output delivering +12 dBm. It must be connected through an external DC-blocking capacitor (e.g., 100 pF) to preserve internal bias. No external matching network is required for standard 50 Ω systems, but PCB trace impedance must be tightly controlled to 50 Ω to avoid reflections that degrade phase noise and output power flatness.

How is lock detection implemented on the HMC767LP6CETR?

Lock detection on the HMC767LP6CETR is available on the LD_SDO pin (Pin 33), which can be configured as a lock detect flag via SPI register. When enabled, it asserts high after successful PLL lock (within ±10° phase error over 10 consecutive cycles). The output is CMOS-compatible and can drive an LED or microcontroller interrupt. Lock status can also be read back via the same pin in serial data-out mode.

What thermal management is required for continuous operation of the HMC767LP6CETR?

The HMC767LP6CETR has a junction-to-ground-paddle thermal resistance of 24.8 °C/W. For continuous operation at max ambient (+85°C) and full VCO current (270 mA @ 5 V), the exposed paddle must be soldered to a minimum 200 mm² copper area with ≥6 thermal vias (0.3 mm diameter) to inner/ground planes. Without adequate heatsinking, junction temperature may exceed 135°C, reducing MTTF below 1 million hours.