Analog Devices ADMP421
MEMS microphone

Physical Analysis of the Device
Step by Step Reconstruction of the Process Flow
Cost of Manufacturing and Estimation of Selling Price

Yole Développement is proud to publish the reverse costing report on the ADMP421 microphone designed by Analog Devices and manufactured by TSMC.
The ADMP421ACEZ is a digital MEMS Microphone using a free-floating diaphragm, and a capacitive sensing.
It offers a full integration of a MEMS microphone and an amplification ASIC in a 4-pin LGA package.
This microphone is for high-end consumer applications: tablets, smartphones.

This report provides complete teardown of the microphone MEMS with:

• Detailed photos
• Material analysis
• Schematic assembly description
• Manufacturing Process Flow
• In-depth economical analysis
• Manufacturing cost breakdown
• Selling price estimation

TABLE OF CONTENTS

1. Overview / Introduction p.4

• Executive Summary
• Reverse Costing Methodology

2. Company Profile p.6

• Analog Devices       

3. Physical Analysis p.11

• Package Characteristics & Markings
• Package X-Ray
• Package Composition
• Package Opening & Bonding Number
• Package Cross-Section
• ASIC Dimensions
• ASIC Minimal Dimension and Metal Layers
• ASIC Transistor Details
• ASIC Process Characteristics
• Microphone Details
• Microphone Dimensions
• Microphone Structure
• Microphone Cross-Section
• Microphone process characteristics

4. Manufacturing Process Flow p.44

• ASIC Process Flow
• Microphone Process Flow
• Package Process Flow
• Description of the Wafer Fabrication Units   

5. Cost Analysis p.57

• Supply Chain Analysis
• ASIC Wafer Cost
• ASIC Die Cost
• Microphone Wafer Cost Hypothesis
• Microphone Wafer Cost
• Microphone Die cost
• ADMP421 Packaging Process Flow
• ADMP421 Packaging Cost Details
• ADMP421 Final Test Cost
• ADMP421 Component Manufacturing Cost
• Yield Synthesis

6. Estimated Manufacturer Price Analysis p.85

• Manufacturers ratios   
• Estimated manufacturer Price