Analog Devices Inc. HMC1033LP6GETR

Overview

HMC1033LP6GETR from Analog Devices (formerly Hittite Microwave) is a high-performance, +3.3 V fractional-N clock generator IC with integrated VCO, delivering differential LVDS/LVPECL outputs from 25 MHz to 550 MHz. It features 99 fs RMS jitter (12 kHz–20 MHz, 350 MHz output), –163 dBc/Hz phase noise floor, and SPI-programmable output amplitude, mode, and mute-used in optical transponders, FPGA clocks, and high-speed data converter sampling.

For engineers reviewing the HMC1033LP6GETR datasheet, HMC1033LP6GETR pinout, HMC1033LP6GETR application, or HMC1033LP6GETR equivalent, key selection criteria include its dual-mode PLL (Integer/Fractional-N), configurable termination (internal LVDS or external LVPECL), exact-frequency tuning capability (0 Hz error), and low-power vs. low-jitter operational modes across –40°C to +85°C.

Technical Context

The HMC1033LP6GETR integrates a 24-bit Delta-Sigma modulator and low-noise phase detector capable of up to 100 MHz PFD frequency, enabling wide loop bandwidths and superior spurious performance. Its VCO operates across 2.5–5.0 GHz, divided down via programmable RF dividers (1,2,4,…,62) to yield final outputs from 25–550 MHz.

It supports two distinct operating modes: "Power Priority" (reduced current draw, e.g., 195 mA at 350 MHz LVDS) and "Performance Priority" (optimized jitter, e.g., 99 fs RMS at 350 MHz). Output swing is digitally adjustable across 13 gain steps (690–2560 mVpp), and termination is selectable between internal (LVDS-compatible) or external (LVPECL-compatible) configurations via SPI register control.

Key Specifications

Pinout & Package

40-lead, 6×6 mm LFCSP package (HMC1033LP6GE marking, RoHS-compliant, MSL1); exposed ground paddle requires soldering to PCB RF ground per Hittite AN recommendations.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar clock generator applications.

Compared with LMK04828BISQE/NOPB and Si5341-B-GM, the HMC1033LP6GETR offers superior phase noise floor (–163 dBc/Hz) and simpler single-loop architecture ideal for dedicated high-frequency clock synthesis, but lacks multi-output capability and deterministic latency features found in newer generation jitter cleaners.

Availability

HMC1033LP6GETR is available at Aetrix Electronics and suitable for 10G/40G/100G optical modules, high-speed data converter timing, and FPGA clock distribution requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for HMC1033LP6GETR 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 and timing product lines under the Analog Devices brand.

The HMC1033LP6GETR belongs to Hittite's legacy clock generator family designed specifically for telecom infrastructure, optical networking, and high-speed data acquisition - emphasizing ultra-low jitter, wide frequency agility, and robust industrial qualification.

FAQ

What is the minimum and maximum output frequency supported by the HMC1033LP6GETR?

The HMC1033LP6GETR supports a guaranteed output frequency range of 25 MHz to 550 MHz across –40°C to +85°C. This range is achieved using its integrated 2.5–5.0 GHz VCO and programmable RF dividers (1,2,4,…,62). Frequencies below 25 MHz or above 550 MHz are not specified and may exhibit degraded jitter or phase noise performance. The HMC1033LP6GETR achieves exact-frequency synthesis within this band using its 24-bit Delta-Sigma modulator.

Does the HMC1033LP6GETR support both LVDS and LVPECL output standards?

Yes, the HMC1033LP6GETR supports both LVDS and LVPECL-compatible differential outputs via SPI-configurable termination. In LVDS mode, internal 100 Ω termination is enabled, yielding common-mode voltage of 1.2 V and output swing from 690–2560 mVpp. In LVPECL mode, internal termination is disabled and external biasing (e.g., 50 Ω to VCC–2 V) is used, resulting in 2.0 V common-mode voltage. Both modes support AC or DC coupling per receiver requirements.

How does the "Power Priority" vs. "Performance Priority" mode affect the HMC1033LP6GETR's operation?

In Power Priority mode, the HMC1033LP6GETR reduces total supply current (e.g., 195 mA at 350 MHz LVDS) by optimizing bias currents in analog blocks. In Performance Priority mode, it maximizes phase noise and jitter performance (e.g., 99 fs RMS at 350 MHz) by increasing VCO and charge pump drive strength. Both modes retain full functionality and are selected via SPI register bit; switching between them requires no hardware change or reset.

What is the purpose of the VTUNE pin on the HMC1033LP6GETR, and how is it used?

VTUNE is the analog tuning voltage input for the integrated VCO. It accepts a filtered DC voltage (0.3–3.0 V typical) generated by the external passive loop filter (R2, R3, R4, C1–C4). The loop filter sets PLL bandwidth and stability; HMC1033LP6GETR's datasheet specifies a recommended 127 kHz bandwidth design. VTUNE must be decoupled with low-ESR capacitors; improper filtering causes increased close-in phase noise or loss of lock.

Can the HMC1033LP6GETR generate an output with zero frequency error relative to the reference input?

Yes, the HMC1033LP6GETR implements Exact Frequency Mode using its 24-bit Delta-Sigma modulator to achieve 0 Hz static frequency error versus the reference input - critical for applications like synchronous Ethernet (SyncE) and OTN where long-term frequency accuracy is mandated. This mode is enabled via SPI and works across the full 25–550 MHz output range, provided the reference frequency and desired output satisfy the N-divider constraints (integer or fractional divide ratio).