Analog Devices Inc. 109293-HMC535LP4

Overview

109293-HMC535LP4 from Analog Devices (formerly Hittite Microwave) is a GaAs InGaP HBT monolithic phase-locked oscillator IC operating from 14.7 to 15.4 GHz, delivering +9 dBm RF output power at +5 V VCO supply, with -110 dBc/Hz typical phase noise at 100 kHz offset and integrated lock detection for VSAT radio local oscillator synthesis.

For engineers reviewing the 109293-HMC535LP4 datasheet, 109293-HMC535LP4 pinout, 109293-HMC535LP4 application, or 109293-HMC535LP4 equivalent, key selection criteria include RF frequency range, phase noise performance across temperature, multi-rail supply requirements (+5V/+12V/+5V), differential reference input compatibility (229.69–240.62 MHz), and QFN-24 package thermal and grounding constraints.

Technical Context

The 109293-HMC535LP4 integrates VCO, phase-frequency detector (PFD), prescaler (÷64), op-amp, and digital logic in a single GaAs MMIC die, enabling closed-loop PLL operation with external loop filter components. Its monolithic architecture ensures stable phase noise over -40°C to +85°C and shock/vibration environments.

It accepts single-ended or differential reference inputs (229.69–240.62 MHz, 0–10 dBm), provides a digital lock detect (LD) output, and supports tuning voltage range of 0–13 V with RF pushing < ±20 MHz/V and pulling < ±35 MHz under 2:1 VSWR load variation.

Key Specifications

Pinout & Package

109293-HMC535LP4 is housed in a 24-lead, 4 mm × 4 mm leadless QFN package with exposed ground paddle requiring solder connection to PCB RF ground plane per Hittite land pattern guidelines. Package is MSL1 rated with Sn/Pb finish (HMC535LP4 variant).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar phase-locked oscillator applications.

Compared with HMC535LP4, the HMC535LP4E offers identical RF performance with RoHS compliance, while HMC739LP4 trades reference flexibility and tuning voltage compatibility for improved phase noise and extended lower-band coverage-neither is pin-compatible nor functionally substitutable without circuit revision.

Availability

109293-HMC535LP4 is available at Aetrix Electronics and suitable for Ka-band VSAT terminals, point-to-point microwave links, and military radar front-ends requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for 109293-HMC535LP4 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, including GaAs and SiGe MMICs for defense, aerospace, and communications infrastructure.

The HMC535LP4 belongs to Hittite's PLOS (Phase-Locked Oscillator Series) product line, designed specifically for compact, high-stability Ka-band LO generation in space-constrained, thermally demanding RF systems.

FAQ

What is the recommended PCB layout practice for the 109293-HMC535LP4 RF output?

The 109293-HMC535LP4 RFOUT pin requires AC coupling via an external DC blocking capacitor before connecting to a 50 Ω transmission line. The package's exposed ground paddle and dedicated GND pins (7, 9) must be soldered to a solid RF ground plane using multiple thermal vias. Rogers 4350 substrate is recommended for evaluation, per Hittite's 109291 Eval Board design.

Does the 109293-HMC535LP4 support single-ended reference input?

Yes, the 109293-HMC535LP4 supports both single-ended and differential reference inputs. When using single-ended mode, drive the REF pin (15) with a 229.69–240.62 MHz signal referenced to ground, while leaving NREF (16) DC-blocked and terminated to 50 Ω. Differential mode provides superior noise rejection and is preferred in noisy RF environments.

What is the absolute maximum tuning voltage for the 109293-HMC535LP4 Vtune pin?

The absolute maximum tuning voltage for the 109293-HMC535LP4 Vtune pin (pin 4) is +13 Vdc, as specified in the Absolute Maximum Ratings table. Exceeding this voltage risks permanent damage to the VCO core. For reliable operation, maintain Vtune within 0–12 V, where tuning sensitivity and linearity are characterized.

How does the 109293-HMC535LP4 lock detect (LD) output behave during acquisition?

The 109293-HMC535LP4 LD output transitions from low (<0.5 V) to high (>0.7 V) when the PLL achieves frequency and phase lock. During acquisition, LD remains low until loop settling completes (~20 μs typical). This open-drain–compatible signal can interface directly with FPGA GPIO or microcontroller interrupt pins for automated lock validation in test systems.

Can the 109293-HMC535LP4 operate from a single +5 V supply?

No, the 109293-HMC535LP4 requires three separate supply rails: +5 V for Vcc1 (VCO) and Vcc3 (digital logic), and +12 V for Vcc2 (op-amp). Attempting to power Vcc2 from +5 V will prevent proper op-amp biasing and cause PLL failure. Decoupling capacitors must be placed near each supply pin per the evaluation board schematic.