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...
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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 board carries a small or fine-pitched component and brings its connections out to standard, breadboard- and header-friendly pins. Describing a part as a breakout means it can be wired into a project without soldering directly to the component's tiny 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 (mux) is a chip or circuit that selects one of several input signals and routes it to a single shared output, with select lines choosing which input is connected; running the same idea in reverse, to send one input to a chosen output, gives a demultiplexer. Multiplexers let a single controller or line work with several signals or devices that would otherwise clash on a shared connection.
- 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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