Analog Devices Inc. HMC783LP6CE

Overview

HMC783LP6CE from Analog Devices (formerly Hittite Microwave) is a fully integrated Fractional-N PLL with on-chip VCO operating from 11.5 to 12.5 GHz, delivering 11 dBm typical RF output power, ultra-low phase noise (–95 dBc/Hz @ 10 kHz offset in fractional mode), and 24-bit frequency resolution. It serves as a high-performance local oscillator synthesizer for microwave radio front-ends.

For engineers reviewing the HMC783LP6CE datasheet, HMC783LP6CE pinout, HMC783LP6CE application, or HMC783LP6CE equivalent, key selection criteria include its 12 GHz VCO band, integrated charge pump and prescaler, 40-pin 6 × 6 mm QFN package, cycle-slip prevention, and direct FSK modulation capability - all critical for VSAT, phased array, and test equipment designs.

Technical Context

The HMC783LP6CE implements a delta-sigma modulator-based Fractional-N architecture supporting both integer and fractional modes, enabling fine frequency steps down to 3 Hz while suppressing fractional spurs to –65 dBc. Its open-loop VCO achieves –134 dBc/Hz phase noise at 1 MHz offset and –110 dBc/Hz at 100 kHz offset (12 GHz).

It integrates dual supply domains: +5 V for VCO and charge pump sections (VCCVCO1, VDDCP, VCCCP), and +3.3 V for analog/digital logic (AVCC, DVDD, VDDIO), with dedicated bias reference (1.92 V ±20 mV) and lock detect output (LD_SDO). The 40-pin QFN supports serial SPI-like programming via CE/SEN/SCK/SDI/SDO pins.

Key Specifications

Pinout & Package

Package: 40-lead, leadless QFN, 6 × 6 mm surface-mount package with exposed ground paddle; RoHS-compliant, MSL3 rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC783LP6CE, the HMC783LP6CE-EP offers extended temperature reliability without performance compromise, while ADF4371BCPZ trades Ku-band optimization for wider band coverage and integrated regulation - making HMC783LP6CE optimal for fixed-frequency, high-agility Ku-band LO generation.

Availability

HMC783LP6CE is available at Aetrix Electronics and suitable for VSAT terminals, point-to-point microwave links, and phased array radar subsystems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for HMC783LP6CE 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 RFIC portfolio, emphasizing microwave/mmWave integration, low-phase-noise synthesis, and defense-grade reliability.

The HMC783LP6CE belongs to Hittite's "PLLS w/ Integrated VCO - SMT" product line, designed specifically for compact, high-performance LO generation in satellite, radar, and wireless infrastructure where board space and phase noise are critical constraints.

FAQ

What is the recommended power supply sequencing for HMC783LP6CE?

HMC783LP6CE requires strict power-up order: apply +3.3 V supplies (AVCC, DVDD, VDDIO) first, then +5 V supplies (VCCVCO1, VDDCP, VCCCP). Reverse sequencing risks latch-up or undefined state. The HMC783LP6CE datasheet specifies that AVDD must equal DVDD and VCCCP must equal VDDCP to ensure proper internal biasing and charge pump operation.

Does HMC783LP6CE support integer-N mode only, or is fractional-N required?

HMC783LP6CE supports both integer-N and fractional-N modes via register configuration. In integer mode, it achieves –99 dBc/Hz phase noise at 10 kHz offset and a figure of merit of –226 dBc/Hz, offering lower spurs and simpler loop filter design. The HMC783LP6CE defaults to fractional mode for maximum resolution but can be configured for integer-only use in fixed-frequency applications.

How is the lock detect function implemented on HMC783LP6CE?

HMC783LP6CE provides lock detection via the LD_SDO pin (Pin 33), which operates as an open-drain output asserting low when the PLL is locked. This signal is derived from internal phase error monitoring and is independent of serial port activity. When reading registers, LD_SDO multiplexes as serial data output (SDO), so software must disable lock detect during read operations to avoid contention. The HMC783LP6CE lock window is factory-trimmed and stable over temperature.

Can HMC783LP6CE drive a mixer directly without external amplification?

Yes, HMC783LP6CE delivers 11 dBm typical RF output power into 50 Ω, sufficient to directly drive the LO port of Hittite's Hi-Linearity mixers (e.g., HMC774, HMC1040) without external buffering. Its output is AC-coupled and requires only a series DC-blocking capacitor. The HMC783LP6CE output power varies ±2 dB across the 11.5–12.5 GHz band and is specified at +25°C; derating applies above +85°C ambient.

What is the purpose of the BIAS pin (Pin 20) on HMC783LP6CE?

The BIAS pin (Pin 20) provides access to the internal 1.920 V ±20 mV precision reference voltage used for analog biasing. It is not intended to drive external loads; measurement requires a 10 GΩ-input impedance meter (e.g., Agilent 34410A) to avoid loading errors. The HMC783LP6CE datasheet warns that a typical 10 MΩ DVM will read erroneously low. This reference stabilizes VCO tuning slope and charge pump current accuracy across temperature.