Adafruit
Adafruit ADG728 1-to-8 Analog Matrix Switch
· MPN: ADA5899
The Adafruit ADG728 is a solid-state 1-to-8 analog matrix switch controlled over I2C. Unlike relays, analog switches have no moving parts, won't wear out, an...
The Adafruit ADG728 is a solid-state 1-to-8 analog matrix switch controlled over I2C. Unlike relays, analog switches have no moving parts, won't wear out, and switch in approximately 100 ns. Use it to route up to 8 analog signals (up to 5V) to a single common pin, or vice versa — the signal path is fully bidirectional.
The ADG728 features 8 independent switches rather than a simple multiplexer, so you can turn on multiple switches simultaneously to merge signals together, or use it as a traditional SP8T selector. Break-before-make switching ensures clean transitions between channels.
Key Features
- 8 Independent Switches – Route any combination of 8 signals to a single D pin
- I2C Controlled – Simple digital control of all 8 channels
- 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 0x4C, adjustable to 0x4D/0x4E/0x4F via address pins
- Reset Pin – Instantly set all switches to open
- STEMMA QT / Qwiic Connectors – Solderless I2C connection
- Signal Voltage – Supports analog signals up to 5V
Also Available
- ADG729 Dual 1-to-4 Analog Matrix Switch – Two independent 4-channel groups with separate D pins
Ideal For
- Analog signal routing and selection
- Sensor multiplexing
- Audio signal switching
- Test and measurement systems
Package Contents
- 1× Adafruit ADG728 1-to-8 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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