Adafruit
Adafruit ADG729 Dual 1-to-4 Analog Matrix Switch
· MPN: ADA5932
The Adafruit ADG729 is a solid-state dual 1-to-4 analog matrix switch controlled over I2C. It provides two independent groups of 4 switches — four channels r...
The Adafruit ADG729 is a solid-state dual 1-to-4 analog matrix switch controlled over I2C. It provides two independent groups of 4 switches — four channels routed to the DA pin and four channels routed to the DB pin — giving you 8 total switches in a compact package. Unlike relays, analog switches have no moving parts, won't wear out, and switch in approximately 100 ns.
The ADG729 features 8 independent switches rather than a simple multiplexer, so you can turn on multiple switches simultaneously within each group to merge signals together, or use each group as a traditional SP4T selector. The signal path is fully bidirectional. Break-before-make switching ensures clean transitions between channels.
Key Features
- Dual 4-Channel Groups – Four switches route to DA, four route to DB
- 8 Independent Switches – Control each switch individually via I2C
- Fast Switching – Approximately 100 ns switch time
- Break-Before-Make – Deselected switches open before selected switches close
- Bidirectional – Signal path works in either direction
- Configurable Address – Default 0x44, adjustable to 0x45/0x46/0x47 via address pins
- STEMMA QT / Qwiic Connectors – Solderless I2C connection
- Signal Voltage – Supports analog signals up to 5V
Also Available
- ADG728 1-to-8 Analog Matrix Switch – All 8 signals route to a single D pin
Ideal For
- Dual-channel analog signal routing
- Stereo audio switching
- Sensor multiplexing with separate output buses
- Test and measurement systems
Package Contents
- 1× Adafruit ADG729 Dual 1-to-4 Analog Matrix Switch Breakout
Jargon buster
Plain-language definitions for the technical terms used above.
- breakout
- A breakout is a small circuit board that makes a tiny or hard-to-solder component easier to connect to with standard pins. It matters because this OLED module can be wired into a microcontroller project without needing to solder directly to the display’s fine contacts.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- multiplexer
- A multiplexer is a chip or board that lets one controller switch between several devices that would otherwise conflict on the same bus. It matters here because multiple modules with the same I2C address cannot normally share one I2C bus without extra hardware.
- Qwiic
- Qwiic is a plug-in connector system for I2C devices that uses small 4-pin cables, so you can connect compatible sensors without soldering. It matters because your controller or adapter also needs Qwiic, or you will need a cable or breakout to wire it up.
- STEMMA QT
- A small plug-in connector system for I2C boards that lets you connect compatible sensors and controllers without soldering. It matters because it can make wiring faster and less error-prone, especially when adding several small modules to a project.
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