Ryan Malloy
a5560470ea
Datasheet extraction, module specs, marketing photos, and project CLAUDE.md with local resource inventory.
198 lines
5.9 KiB
Markdown
198 lines
5.9 KiB
Markdown
# HMC472A Digital RF Attenuator - Module Specifications
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Extracted from Analog Devices HMC472A datasheet for the Amazon module variant.
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---
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## Electrical Specifications
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**Test Conditions:** T_A = +25°C, Vdd = +5V, Vctl = 0/+5V (unless otherwise noted)
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| Parameter | Frequency | Min | Typ | Max | Units |
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|-----------|-----------|-----|-----|-----|-------|
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| **Insertion Loss** | DC - 1.5 GHz | — | 1.4 | 1.8 | dB |
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| | 1.5 - 3.0 GHz | — | 1.7 | 2.3 | dB |
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| | 3.0 - 3.8 GHz | — | 1.9 | 3.0 | dB |
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| **Attenuation Range** | DC - 3.8 GHz | — | 31.5 | — | dB |
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| **Return Loss** (RF1 & RF2, All States) | DC - 3.8 GHz | — | 20 | — | dB |
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### Attenuation Accuracy
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Referenced to insertion loss:
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| Attenuation States | Frequency | Max Error |
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|--------------------|-----------|-----------|
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| All States | DC - 1.0 GHz | ±(0.20 + 3% of Setting) dB |
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| 0.5 - 3.5 dB States | 1.0 - 2.2 GHz | ±(0.15 + 4% of Setting) dB |
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| 4.0 - 31.5 dB States | 2.2 - 3.0 GHz | ±(0.30 + 3% of Setting) dB |
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| All States | 3.0 - 3.8 GHz | ±(0.35 + 5% of Setting) dB |
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### Power Handling & Linearity
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| Parameter | Frequency | Value | Units |
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|-----------|-----------|-------|-------|
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| Input Power for 0.1 dB Compression | 0.1 - 3.8 GHz | 30 | dBm |
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| **IIP3** (Two-Tone, 0 dBm each) | | | |
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| — REF to 15.5 dB States | 0.1 - 3.8 GHz | 54 | dBm |
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| — 16.0 to 31.5 dB States | 0.1 - 3.8 GHz | 49 | dBm |
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### Switching Characteristics
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| Parameter | Frequency | Typical | Units |
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|-----------|-----------|---------|-------|
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| t_RISE, t_FALL (10/90% RF) | DC - 3.8 GHz | 40 | ns |
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| t_ON, t_OFF (50% CTL to 10/90% RF) | DC - 3.8 GHz | 60 | ns |
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---
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## Bias Voltage & Current
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**Supply:** Vdd = +5V ± 10%
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| Vdd (V) | Idd Typical (mA) |
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|---------|------------------|
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| +4.5 | 2.4 |
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| +5.0 | 2.5 |
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| +5.5 | 2.6 |
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---
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## Control Voltage States
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| State | Bias Condition |
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|-------|----------------|
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| **Low** | 0 to +0.8 Vdc @ -5 µA Typ. |
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| **High** | +2.0 to +5.0 Vdc @ 40 µA Typ. |
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> **Note:** Vdd = +5V
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---
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## Truth Table
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Each control pin (V1-V6) contributes a specific attenuation value when set **Low**:
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| Pin | Attenuation Value |
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|-----|-------------------|
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| V1 | 16 dB |
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| V2 | 8 dB |
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| V3 | 4 dB |
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| V4 | 2 dB |
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| V5 | 1 dB |
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| V6 | 0.5 dB |
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### Example Attenuation States
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| V1 (16dB) | V2 (8dB) | V3 (4dB) | V4 (2dB) | V5 (1dB) | V6 (0.5dB) | Total Attenuation |
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|-----------|----------|----------|----------|----------|------------|-------------------|
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| High | High | High | High | High | High | Reference (I.L.) |
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| High | High | High | High | High | Low | 0.5 dB |
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| High | High | High | High | Low | High | 1 dB |
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| High | High | High | Low | High | High | 2 dB |
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| High | High | Low | High | High | High | 4 dB |
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| High | Low | High | High | High | High | 8 dB |
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| Low | High | High | High | High | High | 16 dB |
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| Low | Low | Low | Low | Low | Low | 31.5 dB |
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> **Note:** Any combination of the above states will provide an attenuation approximately equal to the sum of the bits selected.
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---
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## Functional Diagram & Pinout
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### Pin Assignment (24-Pin QFN, Top View)
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| Pin | Function | Pin | Function |
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|-----|----------|-----|----------|
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| 1 | N/C | 13 | ACG7 |
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| 2 | VDD | 14 | N/C |
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| 3 | N/C | 15 | RF2 |
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| 4 | RF1 | 16 | N/C |
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| 5 | N/C | 17 | N/C |
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| 6 | ACG1 | 18 | N/C |
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| 7 | ACG2 | 19 | V1 (16 dB) |
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| 8 | ACG3 | 20 | V2 (8 dB) |
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| 9 | ACG4 | 21 | V3 (4 dB) |
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| 10 | ACG5 | 22 | V4 (2 dB) |
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| 11 | ACG6 | 23 | V5 (1 dB) |
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| 12 | N/C | 24 | V6 (0.5 dB) |
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| **Base** | **GND** | | |
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---
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## Application Circuit
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### Recommended Component Values
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| Reference | Value | Function |
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|-----------|-------|----------|
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| C1 | 1000 pF | VDD bypass capacitor |
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| C2 | 1000 pF | RF1 DC blocking / coupling |
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| C3 | 1000 pF | RF2 DC blocking / coupling |
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| C4-C8 | 330 pF | ACG2-ACG6 bypass capacitors |
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| C9 | 330 pF | ACG7 bypass capacitor |
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### Circuit Notes
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- **VDD** (pin 2) requires 1000 pF bypass to ground
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- **RF1** (pin 4) and **RF2** (pin 15) use 1000 pF DC blocking capacitors for AC coupling
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- **ACG pins** (ACG2-ACG6 on pins 7-11, ACG7 on pin 13) require 330 pF bypass capacitors to ground
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> **Note:** For operations from 700 MHz to 2700 MHz, pins 6 through 13 (ACG1-ACG7) may be left unconnected.
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---
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## Performance Graphs
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### Insertion Loss vs Frequency
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Two graphs showing insertion loss across temperature (+25°C, +85°C, -40°C):
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1. **Low Frequency Range (DC - 350 MHz)**
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- Insertion loss approximately 1.0 to 1.2 dB
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- Minimal temperature variation
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2. **Full Frequency Range (DC - 4 GHz)**
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- Insertion loss increases from ~1.2 dB at low frequencies to ~2.0 dB at 4 GHz
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- Temperature variation more pronounced at higher frequencies
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- -40°C shows best performance, +85°C shows highest loss
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### Return Loss RF1 & RF2
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Two graphs showing return loss for major attenuation states:
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1. **Low Frequency Range (DC - 350 MHz)**
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- Return loss typically better than -15 dB across all states
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- Best performance around 100 MHz
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2. **Full Frequency Range (DC - 4 GHz)**
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- Reference and low attenuation states (0.5-16 dB): -15 to -25 dB return loss
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- Maximum attenuation state (31.5 dB): return loss degrades above 2 GHz
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- All states maintain better than -10 dB return loss across band
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---
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## Quick Reference Summary
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| Specification | Value |
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|---------------|-------|
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| Frequency Range | DC - 3.8 GHz |
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| Attenuation Range | 0 - 31.5 dB |
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| Step Size | 0.5 dB |
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| Insertion Loss (typ) | 1.4 - 1.9 dB |
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| Return Loss (typ) | 20 dB |
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| IIP3 | 49 - 54 dBm |
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| Supply Voltage | +5V ± 10% |
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| Supply Current | 2.5 mA typ |
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| Switching Speed | 40 - 60 ns |
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| Package | 24-pin QFN |
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| Input/Output Impedance | 50Ω |
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