At 07:16 AM 31/10/2011, you wrote: >----- Original Message ----- >From: "Bob Ammerman" >To: "Microcontroller discussion list - Public." >Sent: Monday, October 31, 2011 7:12 AM >Subject: Re: [EE] MSPS and MHz > > > >>>Now that I know how to transfer to the computer at high speeds (via > >>>FT232H), and have some solid FPGA groundwork down, I'm trying to make = an > >>>analog signal analyzer with a parallel interface ADC. I'm looking to > >>>sample > >>>signals no more then 1MHz (and at most up to 5V), so I thought I'd cho= ose > >>>a > >>>part of at least 5MSPS. > >>> > >>>http://www.linear.com/product/LTC1405 > >>> > >>>This chip looks good. Not too expensive, 12 bit, 5MSPS, simple paralle= l > >>>interface. But it also says 100MHz full power bandwidth sampling. I do= n't > >>>understand, if it can sample at 5MSPS, how can it sample a 100MHz sign= al? > >> > >> How? The tacq for that ADC is 50ns. Why would you want to? You can sam= ple > >> a 100MHz signal at 5MSPS and still be above The Shannon-Nyquist if the > >> signal > >> is band-limited. > > > > > >Sorry about the prior empty post. Accidently sent. > >I am guessing the high bandwidth is to support "equivalent time sampling", >although with a Tacq of 50ns it would seem you could only go to about 20MH= z. > >--Bob Ammerman >RAm Systems The acquisition time is to acquire a sample (usually to 1 LSB, though they don't specify). The full power bandwidth is the 3dB down point. Best regards, Spehro Pefhany --"it's the network..." "The Journey is the rewar= d" speff@interlog.com Info for manufacturers: http://www.trexon.co= m Embedded software/hardware/analog Info for designers: http://www.speff.co= m --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .