Analog Devices Inc. HMC977LP4E

Overview

HMC977LP4E from Analog Devices is a GaAs MMIC I/Q downconverter IC operating from 20 GHz to 28 GHz RF, with 14 dB typical conversion gain, 2.5 dB typical noise figure at 20–26.5 GHz, and 21 dBc image rejection - deployed in military radar, satellite communications, and point-to-point radio front-ends.

For engineers reviewing the HMC977LP4E datasheet, HMC977LP4E pinout, HMC977LP4E application, or HMC977LP4E equivalent, this page delivers verified RF performance specs, validated 24-pin LFCSP package mapping, confirmed biasing architecture (VDRF/VDLO1/VDLO2), and sideband-selectable IF interface requirements with external 90° hybrid coupling.

Technical Context

The HMC977LP4E integrates a low-noise amplifier followed by an image-reject mixer driven by an internal active 2× LO multiplier, eliminating post-LNA image filtering and suppressing thermal noise at the image frequency. It requires no power sequencing and operates across −40°C to +85°C.

It delivers dual dc-coupled IF outputs (IF1, IF2) for quadrature demodulation, with amplitude balance ≤0.3 dB and phase balance ≤17° over 20–26.5 GHz; sideband selection (upper/lower) is determined by external 90° hybrid connection topology per the IF port assignment.

Key Specifications

Pinout & Package

24-lead 4 mm × 4 mm leadless LFCSP (HCP-24-2) with exposed thermal pad requiring direct solder connection to ground plane; θ_JC = 56.3°C/W on JEDEC 2S2P board with 4 mm × 4 mm thermal vias.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar I/Q downconverter applications.

Compared with HMC1040LP4E and ADMV1013ACPZ, the HMC977LP4E delivers the lowest noise figure (2.5 dB) and highest image rejection (21 dBc) specifically within the 20–26.5 GHz segment, making it optimal for high-sensitivity satellite and radar receivers where signal integrity is critical.

Availability

HMC977LP4E is available at Aetrix Electronics and suitable for military radar, satellite communications, and point-to-point radio applications requiring stable component supply, RoHS-compliant packaging, and guaranteed long-term availability in high-reliability environments.

Supply support for HMC977LP4E 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 is a global leader in high-performance analog, mixed-signal, and RF ICs, serving aerospace, defense, communications, and industrial markets with precision signal processing solutions.

The HMC977LP4E belongs to Analog Devices' Hittite Microwave MMIC product line, engineered for millimeter-wave communication and sensing systems demanding low-noise, high-linearity, and compact surface-mount integration.

FAQ

What is the recommended LO drive level for optimal performance of the HMC977LP4E?

The HMC977LP4E achieves best conversion gain and image rejection with LO drive between 2 dBm and 6 dBm. At 6 dBm, typical conversion gain is 14 dB and image rejection reaches 21 dBc across 20–26.5 GHz. Driving below 2 dBm degrades conversion gain and increases noise figure; above 6 dBm risks exceeding absolute maximum ratings and may increase spurious content. The HMC977LP4E datasheet specifies 6 dBm as the nominal test condition for all key RF parameters.

Does the HMC977LP4E require external filtering before the RF input?

No, the HMC977LP4E does not require external RF pre-filtering because its integrated image-reject mixer architecture suppresses thermal noise at the image frequency, eliminating the need for post-LNA image-reject filters. However, bandpass filtering may still be used upstream to limit out-of-band interference or protect against strong adjacent-channel signals exceeding the 2 dBm absolute maximum RF input rating. The HMC977LP4E's RF port is matched to 50 Ω from 20–28 GHz, supporting direct connection to antenna or duplexer outputs.

How is upper versus lower sideband selected using the HMC977LP4E?

Sideband selection for the HMC977LP4E is determined by external 90° hybrid connection: for upper sideband (low-side LO), connect IF2 to the 0° port and IF1 to the 90° port; for lower sideband, reverse the connections - IF2 to 90° port and IF1 to 0° port. This configuration leverages the inherent quadrature relationship between IF1 and IF2 outputs. The HMC977LP4E itself does not perform sideband selection internally - it relies on the hybrid's phase summation to isolate the desired sideband, as detailed in Figure 52 of the HMC977LP4E datasheet.

What is the function of the VDLO1, VDLO2, and VDRF pins on the HMC977LP4E?

VDLO1 supplies the first-stage LO amplifier, VDLO2 supplies the second-stage LO amplifier (driving the internal 2× multiplier), and VDRF supplies the RF low-noise amplifier. Each is independently biased at 3.325–3.675 V and must be decoupled with local 10 nF and 4.7 μF capacitors per the evaluation board layout (Figure 53). These separate supplies allow optimization of LO drive strength and RF gain independently - critical for balancing conversion gain, noise figure, and linearity in the HMC977LP4E. All three pins are essential for full functionality; omitting any disables the corresponding functional block.

Can the HMC977LP4E operate with IF frequencies down to DC?

Yes, both IF1 and IF2 pins on the HMC977LP4E are dc-coupled and support operation from DC to 3.5 GHz. For true dc-coupled use, each IF port must not source or sink more than 3 mA of current to avoid device nonfunctionality or failure. If dc operation is unnecessary, external series capacitors can be added to block dc while passing the required IF band. The HMC977LP4E's dc-coupled architecture enables zero-IF receiver designs and simplifies interfacing with baseband processors or high-speed ADCs without ac-coupling constraints - a key advantage over ac-coupled alternatives.