Analog Devices Inc. 132032-HMC948LP3E

Overview

HMC948LP3E from Analog Devices (formerly Hittite Microwave) is a 1–23 GHz logarithmic RF power detector IC that converts input RF signals into a proportional DC voltage output using successive compression topology. It delivers 54 dB dynamic range, +14.2 mV/dB slope at 23 GHz, and operates from a single +3.3 V supply. It is used in microwave radio RSSI and wideband power monitoring circuits.

For engineers reviewing the HMC948LP3E datasheet, HMC948LP3E pinout, HMC948LP3E application, or HMC948LP3E equivalent, key selection criteria include logarithmic accuracy over temperature (±1.5 dB), fast 5 ns rise time, 16-lead 3×3 mm SMT package grounding requirements, and compatibility with 50 Ω RF signal paths in VSAT and point-to-point radio designs.

Technical Context

The HMC948LP3E implements a multi-stage successive-compression architecture where cascaded amplifiers saturate progressively to approximate a logarithmic response. Its output is derived from summed square-law detector outputs converted to voltage and buffered for LOG OUT drive.

It requires a minimum 1 kΩ load on LOG OUT, mandates RF/DC grounding of all GND pins and the exposed paddle, and specifies strict supply ramp-up (<100 µs) to ensure stable startup. Input return loss exceeds 10 dB across 1–23 GHz.

Key Specifications

Pinout & Package

Package: 16-lead 3×3 mm RoHS-compliant plastic QFN with exposed ground paddle (MSL1, 260 °C peak reflow). Requires soldering of all GND leads and paddle to PCB RF ground plane.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar logarithmic detector applications.

Compared with ADL5513ACPZ-R7 and HMC1093LP3E, the HMC948LP3E provides the widest validated dynamic range (54 dB) and best high-frequency log accuracy (±1.5 dB at 23 GHz), making it optimal for mmWave RSSI and broadband power monitoring where signal fidelity above 18 GHz is essential.

Availability

HMC948LP3E is available at Aetrix Electronics and suitable for point-to-point microwave radio, VSAT terminal, and wideband test & measurement applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant SMT packaging.

Supply support for HMC948LP3E 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, Inc. is a global semiconductor company specializing in high-performance analog, mixed-signal, and RF ICs for communications, industrial, and aerospace applications.

The HMC948LP3E belongs to Analog Devices' legacy Hittite Microwave RF detector product line, engineered for precision logarithmic power measurement in microwave infrastructure and instrumentation where wide bandwidth and temperature stability are critical.

FAQ

What is the operating frequency range of the HMC948LP3E?

The HMC948LP3E operates from 1 GHz to 23 GHz with guaranteed ±3 dB dynamic range across the entire band. At 23 GHz, it maintains 54 dB dynamic range and +14.2 mV/dB log slope. Its input return loss exceeds 10 dB throughout this range, ensuring minimal mismatch loss in 50 Ω systems. The HMC948LP3E is validated for use in Ku-, K-, and Ka-band applications including VSAT and point-to-point radio links.

What supply voltage does the HMC948LP3E require, and what are the startup requirements?

The HMC948LP3E requires a nominal +3.3 V supply, with an operating range of 3.15 V to 3.45 V. Supply current is 91 mA typical. To ensure proper startup, the supply voltage ramp must be faster than 100 µs - slower ramps may cause unstable initialization or output offset errors. All four Vcc pins (13–16) must be individually decoupled with local 10 nF capacitors, as specified in the HMC948LP3E application notes.

How should the ground connections be implemented for the HMC948LP3E?

The HMC948LP3E requires low-inductance RF/DC grounding of pins 3, 6, and 7 plus the exposed ground paddle beneath the package. These must connect directly to a solid PCB ground plane using multiple thermal vias. Per the datasheet, failure to solder the paddle degrades RF performance and thermal dissipation. Pins 1, 4, 5, 8, 9, 10, and 12 are no-connect but may be grounded without impact - they are not required for functionality.

What is the recommended load for the LOG OUT pin of the HMC948LP3E?

The LOG OUT pin of the HMC948LP3E requires a minimum load resistance of 1 kΩ to maintain specified logarithmic accuracy and slope. Lower loads increase output current and introduce nonlinearity and temperature-dependent error. For interfacing with ADCs or op-amps, a unity-gain buffer is recommended if the downstream input impedance falls below 1 kΩ. The datasheet explicitly states "video output load should be 1 kΩ or higher" as a design condition for all published specifications.

Does the HMC948LP3E support operation across its full temperature range, and how does accuracy vary?

Yes, the HMC948LP3E is fully specified from −40 °C to +85 °C. Log error remains within ±1.0 dB from −40 to +25 °C and widens to ±1.5 dB at +85 °C across the 1–23 GHz band. Dynamic range stays ≥54 dB up to 23 GHz at all temperatures. This stability eliminates need for per-temperature calibration in outdoor microwave radios and industrial test equipment where ambient extremes occur.