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Electronics => Electronics => Topic started by: Admin on January 03, 2007, 09:00:04 AM

Title: AVR atmega inductor iron?
Post by: Admin on January 03, 2007, 09:00:04 AM

Im wiring up an ATMEGA 644 and supposedly a 10uH inductor iron should be placed between AVCC/AREF (pins 18 and 20) and VCC (pins 4 and 6). I have a 10uH inductor iron I can use . . . but what does this thing do for the microcontroller? Is it really necessary?

Title: Re: AVR atmega inductor iron?
Post by: Militoy on January 03, 2007, 09:17:56 AM

Any time an inductor is put into a power line, the purpose is to present a series high impedence to AC current. They work in series, similar to the way capacitors work in parallel (shunt) to provide a low-impedence path for unwanted AC currents. In the case of a microprocessor, if heavy pulsed currents are being pulled off the Vcc line, the inductor may be used to offer some isolation from induced ripple to the more critical reference line (AREF).


(edited spelling 1-3-07 R.L.)

Title: Re: AVR atmega inductor iron?
Post by: Hal9000 on January 03, 2007, 01:40:30 PM

I haven't used this in practical application yet, but you know that you can emulate inductance with operational amplifiers right?

I haven't got a clue about the practical constraints of this, like 10uH right?