hmc472/CLAUDE.md

HMC472 Based RF Attenuator

Overview

6-bit digital RF attenuator module based on the Analog Devices HMC472A GaAs MMIC. 0.5 dB steps, 0–31.5 dB range, DC–3.8 GHz. Single +5V supply, SMA connectors, 50Ω impedance. Manual control via 6-position pin header (active-low TTL/CMOS).

External Links

• Manufacturer Page
• Datasheet (PDF)
• Amazon Listing

Local Resources

Datasheet (datasheet/)

• hmc472a.pdf — Full Analog Devices datasheet (8 pages)
• hmc472a.md — Extracted markdown version with all specs, tables, pin descriptions, and application notes
• page_001.png through page_008.png — Individual page images
• vectors/ — SVG extractions from each datasheet page
  • hmc472a_page_N.svg — Full page vector renders (pages 1–8)
  • hmc472a_page_N_drawings.svg — Isolated drawings/diagrams only (pages 1–8)

Module Documentation (docs/)

• module-specs.md — Consolidated module specs: electrical specs, truth table, pin assignments, application circuit, performance graphs
• electrical-specifications.jpg — Electrical specs table from datasheet
• bias-voltage-current-control-voltage-truth-table.jpg — Bias/control voltage and truth table
• functional-diagram-application-circuit.jpg — Block diagram and recommended application circuit
• insertion-and-return-loss-graphs.jpg — Performance graphs across frequency/temperature

Product Photos (marketing/)

• Front and back board photos showing HMC472A IC, SMA connectors, 6-pin header, and passive components

Key Specs (Quick Reference)

Parameter	Value
Frequency Range	DC – 3.8 GHz
Attenuation	0 – 31.5 dB (0.5 dB steps)
Insertion Loss	1.4 – 1.9 dB typ
Step Error	± 0.25 dB typ
IIP3	+49 to +54 dBm
Supply	+5V, 2.5 mA typ
Max Input Power	+20 dBm (module) / +28 dBm (IC abs max)
Switching	40–60 ns
Control	6 pins, active-low (Low = attenuate)

Truth Table (Control Pins)

Pin	Attenuation (when Low)
V1	16 dB
V2	8 dB
V3	4 dB
V4	2 dB
V5	1 dB
V6	0.5 dB

All High = reference (insertion loss only). All Low = 31.5 dB. Any combination sums.