Home 3D Printing EYE on NPI – Richtek RT9120S Sequence Class-D Audio Amplifier with DRC Management #Audio #DigiKey #Adafruit @digikey @RichtekTechnology @Adafruit « Adafruit Industries – Makers, hackers, artists, designers and engineers!

EYE on NPI – Richtek RT9120S Sequence Class-D Audio Amplifier with DRC Management #Audio #DigiKey #Adafruit @digikey @RichtekTechnology @Adafruit « Adafruit Industries – Makers, hackers, artists, designers and engineers!

EYE on NPI – Richtek RT9120S Sequence Class-D Audio Amplifier with DRC Management #Audio #DigiKey #Adafruit @digikey @RichtekTechnology @Adafruit « Adafruit Industries – Makers, hackers, artists, designers and engineers!


This week’s EYE ON NPI (video) is in a category of its personal, it’s Richtek’s RT9120S Sequence Class-D Audio Amplifier with DRC Management, a robust amplifier with a large working voltage vary, excessive effectivity, excessive wattage and lots of supported enter codecs.

We love I2S audio amplifiers right here, they’re an enormous step up from PWM + analog amplifiers in that you’ll get a lot greater audio high quality resulting from having true analog output and the DAC being tuned for 16, 24 or 32-bit audio. Simplest PWM is possibly 8 or 10 bits! So long as your microcontroller or microcomputer has I2S output assist, you should utilize 3 or 4 pins to generate a bitstream of audio.

For instance, our Stereo Bonnet provides two single-channel I2S amplifiers to the Raspberry Pi in order that it could actually drive 3 Watt audio system.

However what in case you want extra MOAR energy? That is the place this I2S amp will shine: it could actually deal with as much as 30W per channel, stereo, and better of all it doesn’t require an MCLK enter sign so it would work nice on Raspberry Pi computer systems of any dimension – though after all it would work on different microcontrollers and microcomputers as nicely. Let’s have a look and a number of the options we like on this chip.

Very first thing to notice is that there are a couple of choices within the RT9120 household: the RT9120 is the unique, the RT9120S is an improve – it could actually now assist 30W as a substitute of 20W because of an RDS(on) as little as 90 mΩ and has 94% effectivity over 92%. It does appear to be pin suitable, so in case you’re utilizing the non-S model this must be pin-compatible for an improve.

This amp is Class D, which suggests in case you’re used to class AB amps that require huge heat-sinking, you’ll be please to know you’ll be able to doubtless get away with out requiring a heat-sink – though you’ll most likely need a huge again floor aircraft and a pair of ozcopper to assist dissipate through the thermal-package floor pad.

The commerce off is you will have some passive elements on the output of the amplifier, as a result of it generates a excessive frequency – as much as 1.5MHz – PWM sign that must be filtered right down to 10-20KHz. It appears to be like like this amp can use easy ferrite bead + capacitor outputs, however for the very best EMI filtering and sound, a 10uH + 0.47uF capacitor is required for every ‘leg’ of output.

As it is a highly effective amp, and since individuals will need to play it loud, and also you’ll need to keep away from nasty clipping, the RT9120 additionally options Dynamic Vary Compression which is able to slowly flip down the acquire because the sign will get louder, so that you just don’t get sq. wave distortion.

Lastly, you will have to manage the chip over I2C, it isn’t free-running. Nonetheless, this implies you’ll be able to allow filters, change the Class D frequency, modify the acquire digitally as a substitute of lowering the sign depth, and get an error output report back to know if there’s a brief or open on the audio system, or lacking I2S sign traces.

Nonetheless, in case you’re utilizing a Linux-based system there’s already a Richtek-authored kernel driver you should utilize.

Sounds good? I believe so! And the truth that the Richtek RT9120S Sequence Class-D Audio Amplifier with DRC Management is in inventory proper now at DigiKey for speedy cargo at a really good value is music to my ears.

You may also choose up an eval board for a really affordable value which is able to get you began rapidly, significantly if it’s good to implement an I2C driver. Order right now and DigiKey will ship your order immediately, it is possible for you to to begin including booming high quality sound to your design by tomorrow afternoon.

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