SparkFun
Graphic Equalizer Display Filter - MSGEQ7
The MSGEQ7 is a CMOS graphic equaliser IC that divides the audio spectrum into seven frequency bands: 63 Hz, 160 Hz, 400 Hz, 1 kHz, 2.5 kHz, 6.25 kHz, and 16...
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The MSGEQ7 is a CMOS graphic equaliser IC that divides the audio spectrum into seven frequency bands: 63 Hz, 160 Hz, 400 Hz, 1 kHz, 2.5 kHz, 6.25 kHz, and 16 kHz. Each band is peak-detected and multiplexed to provide a DC output representing the amplitude — ideal for driving LED audio visualisers and spectrum analysers.
Requires only two external components (one resistor and one capacitor) to set the on-chip clock oscillator. The multiplexer is controlled via reset and strobe pins, allowing readout with just two I/O pins from your microcontroller.
Key Features
- 7-Band Frequency Analysis – 63 Hz, 160 Hz, 400 Hz, 1 kHz, 2.5 kHz, 6.25 kHz, 16 kHz
- Minimal External Components – Only one resistor and one capacitor needed
- 3.3V or 5V Operation – Supply range of 2.7–5.5V (best performance at 5V)
- 20 dB Gain – Built-in signal amplification
- Low Power – Less than 1 mA typical quiescent current
- 2-Pin Multiplexer Control – Reset and strobe pins for simple readout
- Variable Decay Time – Controlled by multiplexer readout rate (10% decay per read)
- 8-Pin DIP Package – Breadboard-friendly form factor
Specifications
- IC – MSGEQ7
- Technology – CMOS switched-capacitor filters
- Supply Voltage – 2.7–5.5V
- Quiescent Current – <1 mA typical
- Package – 8-pin DIP
Ideal For
- LED audio spectrum visualisers
- Music-reactive lighting projects
- Portable audio equipment
- Arduino and microcontroller audio analysis
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- DC
- DC means direct current, where electricity flows in one constant direction, as supplied by batteries, USB ports and many plug-pack power supplies. When a product specifies DC, it runs from a DC supply rather than mains AC, so you need to provide the correct voltage and polarity.
- LED
- A light-emitting diode (LED) is a small electronic component that emits light when current flows through it in the correct direction. Because it only conducts one way, its polarity matters, and a through-hole LED must be soldered the correct way around to light up.
- microcontroller
- A microcontroller is a small computer on a single chip that runs a stored program and controls connected inputs and outputs such as buttons, sensors, displays and communication interfaces. In a device built around one, it is the part that executes the code and coordinates the device's behaviour.
- 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.
Find this product in
Audio & Video
Brands
MSGEQ7 Datasheet
Datasheet · 145.5 KB · Click any page to view full size
Supplier page — sparkfun.com
Supplier Description · 488.0 KB · Click any page to view full size
Related Tutorials
Free guides on learn.littlebird.com.au
