![\"Bild_2\"](\"https:\/\/www.brickrknowledge.de\/content\/uploads\/2016\/02\/Bild_2-300x169.png\")
<\/a><\/p>\nEMODDDS1 utilizzando l\u2019AD9851 consente la generazione di un segnale sinusoidale fino a 90 MHz.<\/p>\n
Internamente, un oscillatore termocompensato genera una frequenza stabile a 30 Mhz che \u00e8 moltiplicata da un chip fino a 180 Mhz.<\/p>\n
La programmazione \u00e8 fatta attraverso il bus SPI. Abbiamo aggiunto un controller I2C per consentire l\u2019espansione con pi\u00f9 DDS brick. Oltre la frequenza, si pu\u00f2 modificare anche la fase.<\/p>\n
Questo consente inoltre di effettuare esperimenti con segnali che abbiamo la fase allineata, come nel caso della modulazione IQ.<\/p>\n
Non abbiamo usato un filtro in uscita per sfruttare la capacit\u00e0 di frequenza armonica del chip. L\u2019output \u00e8 DC coupled per consentire l\u2019utilizzo di segnali a bassa frequenza inferiore di 1 Hz. Un convertitore D\/A interno consente la creazione di un bel segnale sinusoidale.<\/p>\n
Rolf-Dieter K.<\/p>\n
Esempio di codice per generare il video dell\u2019analizzatore di spettro:<\/p>\n
void loop()<\/p>\n
{<\/p>\n
int i;<\/p>\n
WriteAD9851(1.0,1000000.0); \/\/ 1 parameter is phase 0..259 degree then frequency in HZ (also smaller than 1.0).<\/p>\n
delay(2000);<\/p>\n
WriteAD9851(1.0,10000000.0);<\/p>\n
delay(2000);<\/p>\n
WriteAD9851(1.0,20000000.0);<\/p>\n
delay(2000);<\/p>\n
WriteAD9851(1.0,30000000.0);<\/p>\n
delay(2000);<\/p>\n
WriteAD9851(10.0,50000000.0);<\/p>\n
delay(2000);<\/p>\n
WriteAD9851(180.0,90000000.0);<\/p>\n
delay(2000);<\/p>\n
}<\/p>\n
<\/p>\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
Oggi abbiamo un nuovo post nel blog per i maker come te. Lo ha scritto Rolf-Dietler, l\u2019inventore dei bricks, che finalmente ne ha testato uno nuovo. Di seguito puoi vedere un video che ne illustra le caratteristiche: https:\/\/youtu.be\/7X1rgUosuVs Trovi di sotto un esempio di codice per generare un analizzatore di spettro. Attendiamo un tuo feedback […]<\/p>\n","protected":false},"author":3,"featured_media":5279,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[93],"tags":[],"class_list":["post-5299","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorised-it"],"yoast_head":"\n
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Lo ha scritto Rolf-Dietler, l\u2019inventore dei bricks, che finalmente ne ha testato uno nuovo. Di seguito puoi vedere un video che ne illustra le caratteristiche: https:\/\/youtu.be\/7X1rgUosuVs Trovi di sotto un esempio di codice per generare un analizzatore di spettro. 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