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hola Oslong, ha pasado mucho tiempo desde que hiciste este post, pero realmente estoy interesada en saber cuantos bytes es lo maximo que se puede transmitir con este metodo que has desarrollado en labview??, yo necesito enviar por lo menos 2000 datos y en realidad nose como hacerlo, tu tienes...
hey zorx, i have news, i found an RF signal Generator (CRG-450B from GW winstek) with a frecuenci range of 100Khz - 150MHz, and guess what, its the same output, the signal attenuates exactly the same, therefore, there is a problem with the oscilloscope or the leads, im still looking for that...
thats a funny thing, since an application eng. from AD says that the amplitud should be the same until FMCLK/2... im getting crazy about this...
i have been thinking in develop a sistem for change the RSet depending on the frecuency output.. i dont know.. maybe can be a solution. or an...
hi, i undersatand what you say, but since 1MHZ attenuation starts??? if this is true, this DDS sucks!! LOL, sorry im a llttle frustrated.... i´ll wait for the results on monday, thanks a lot zorx!
hi zorx, i have been doing everything, but the signal still dropps, maybe is the TH resistors connected to IOUTB, im going to change it to SMD resistors...
one question, do yo have de 600mV at high frecuencies, or do you have the same problem that me??.
regards
W.G
hey!, 7rots51, did u finally could get a clean output signal from the AD9834BRUZ?, im working with this device, but at 10Mhz the outputsignal it about 200mV without any filter (when should be 600mV), is this happenned to you??
Re: MAX660 PROBLEM
sorry Keith but, i dont understand very well this
i dont get english sometimes :), what did you mean?? im going to change the caapcitance and watch what happend
thanks a lot
Re: MAX660 PROBLEM
hi keith1200rs, now i connected just 1 OPA843 and the max 660 works fine then i connected another OPA843 and the voltage drop at 3.4V. with 1 OPA843, Vout is just a few mV under +VCC (200mV i think), but i found this in the data sheet:
i saw a configuration of 2 max660...
Re: MAX660 PROBLEM
hi!, i have been tested the max660 whitout any load and with the FC pin tied to VCC, and it works perfect!, but why with 4 OPA843 the max660 voltage falls, if every OPA843 need only 23mA...... any idea??
im going to tested again with only 2 OPA843 and see what happend
OMG!!! do you speak spanish!!???...
well im from colombia and i write spanish so much better than english so...
mira la Fmclk la cambie de 75Mhz a 46.666Mhz, ese es el cristal que trabajo ahora, la Rset es de 6.8K Omhios, Rload de 220 , y para Vsupply solo manejo la fuente del USB de mi PC...
mmmm... bad news, the problem wasn´t the 75MHZ MCLK, the proble remains, and i have send a 90 phase value, but nothing happend, i need to mantain de amplitude at 600mV at least at 10MHZ, cry cry!!...
Re: MAX660 PROBLEM
hi thanks for your help, someone knows why i get a warning?, what i do wrong??
otherwise,the problem is that i recycled this tantalum capacitor from other board (PS1, i think), and i dont really know what reference it is, but im going to chekout without any load the MAX660...
hi!! ill appreciatte your help..im trying to produce -Vin out of +Vin, using the MAX660 IC as a negative supply for 4 OPA843. I apply +5V to their input but i cant get an output voltage of -5V .. the higher voltage i csan get its 3.4V, im using 10uF tantalum capacitors on SMD case, i just dont...
hey zorx!!, im late for this reply!, but ihave been very busy trying to make a new board for my 46.6Mhz MCLK and DDS and the op amp part (to make a 3vp-p signal), until now it´s a mess, no possitive results.. but im still fighting jejeje..... nothing to say for now, and how you doing with your DDS??
thanks for the answer zorx, im going to take a look at de .PDF document.....
im just realized that ihave a AD9834 BRUZ, this ref works with a MCLK of 50MHz, and I have a 75Mhz MCLK (this is for the CRUZ REF) maybe this can be a big issue too, what do you think??..
i hope you can tell me how...
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