Analog Devices Inc. HMC807LP6CE

Overview

HMC807LP6CE from Analog Devices (formerly Hittite Microwave) is a fully integrated Fractional-N PLL with on-die VCO, operating from 12.4 to 13.4 GHz. It delivers 8 dBm typical RF output power, supports 24-bit frequency resolution (3 Hz step), and achieves −95 dBc/Hz in-band phase noise at 10 kHz offset (fractional mode, 50 MHz reference). It is designed for local oscillator generation in microwave radio transceivers.

For engineers reviewing the HMC807LP6CE datasheet, HMC807LP6CE pinout, HMC807LP6CE application, or HMC807LP6CE equivalent, key selection criteria include its 12.4–13.4 GHz VCO range, ultra-low phase noise performance (−221 dBc/Hz FoM), direct FSK modulation capability, cycle slip prevention, and 40-pin 6 × 6 mm QFN package with defined RF/DC grounding requirements.

Technical Context

The HMC807LP6CE implements a delta-sigma fractional-N synthesizer architecture with integrated VCO, enabling fine frequency resolution and low spurious content. Its dual-loop architecture separates reference path (14-bit divider, up to 225 MHz input) and feedback path (16-bit integer/fractional N-divider), supporting both fractional and integer-N modes with independent loop bandwidth optimization.

It features a high-performance charge pump (500 µA–2 mA programmable current), ultra-low-noise bias generation (1.920 V ±20 mV internal reference), and robust RF output stage with 8 dBm typical power into 50 Ω. The device operates across −40°C to +85°C with dedicated 3.3 V and 5 V supply domains for analog, digital, and VCO sections.

Key Specifications

Pinout & Package

Package: 40-lead, 6 × 6 mm leadless QFN with exposed thermal paddle. RoHS-compliant, MSL3, matte Sn finish. Requires RF/DC grounding of all GND pins and paddle per Hittite Application Note.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC764LP6CE and ADF4371BCPZ, the HMC807LP6CE provides optimal Ku-band phase noise and output power in a proven, field-deployed package-making it preferred for fixed-frequency, high-reliability VSAT and military radio designs where layout reuse and deterministic performance are prioritized over multi-band flexibility.

Availability

HMC807LP6CE is available at Aetrix Electronics and suitable for VSAT radio, point-to-point microwave backhaul, and phased array radar test equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for HMC807LP6CE 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, integrating its high-frequency RF expertise into a broad portfolio of microwave, millimeter-wave, and mixed-signal solutions.

The HMC807LP6CE belongs to Hittite's "PLLS w/ Integrated VCO - SMT" product line, engineered specifically for microwave radio LO generation where ultra-low phase noise, fast settling, and Ku-band coverage are essential.

FAQ

What is the recommended power supply sequencing for HMC807LP6CE?

HMC807LP6CE requires strict power-up order: apply all 3.3 V supplies (AVCC, DVDD, VDDIO, etc.) before applying 5 V supplies (VCCVCO1, VDDCP). Reverse sequencing risks latch-up or degraded phase noise. The HMC807LP6CE datasheet specifies AVDD must equal DVDD and VCCCP must equal VDDCP; mismatched rails cause functional failure or increased spurs.

Does HMC807LP6CE support differential reference input only, or can it accept single-ended?

HMC807LP6CE accepts only differential AC-coupled reference input via REFP (Pin 24) and REFN (Pin 23). Single-ended drive is not supported - attempting it degrades common-mode rejection and increases reference spurs. The HMC807LP6CE evaluation board uses a balun or transformer to convert single-ended TCXO outputs to differential signals before connecting to these pins.

How is the lock detect (LD_SDO) function implemented on HMC807LP6CE?

LD_SDO (Pin 33) serves dual purpose: as lock detect output (active-high open-drain) and serial data output. When CE = high and SEN toggled, LD_SDO shifts out register contents; when CE = low and SEN held static, LD_SDO asserts high after loop lock is confirmed (typically within 2–3 ms post-configuration). The HMC807LP6CE internal lock detector monitors phase error variance, not just frequency alignment.

Can HMC807LP6CE's VTUNE pin be used for analog FM modulation?

Yes - the HMC807LP6CE VTUNE pin supports analog FM modulation with bandwidth limited by external drive impedance and internal VCO tuning sensitivity (190 MHz/V). For clean modulation, use a low-noise op-amp buffer with <10 Ω source impedance and band-limit filtering to avoid pushing the VCO beyond its 12.4–13.4 GHz range. The HMC807LP6CE datasheet confirms this capability under "Direct FSK Modulation Mode".

What is the thermal resistance (θ_JA) of HMC807LP6CE, and how does it impact layout?

HMC807LP6CE has θ_JG = 34.2 °C/W (junction-to-ground paddle) and operates up to +85°C ambient. To maintain junction temperature ≤120°C, the PCB must provide ≥6 thermal vias (0.3 mm diameter, filled or plated) under the exposed paddle, connected to an internal or bottom-layer solid ground plane. The HMC807LP6CE outline drawing mandates soldering all ground leads and the paddle to RF ground - insufficient thermal relief causes phase drift and accelerated aging.