hi ron, you must connect the sample clock generator to both adc boards in a dual adc system. to do this, you'll need a 2:1 power splitter (about $25 from minicircuits). you can purchase sample clock generators from valon technologies.
the ADC2x1000-8 and ADC1x3000-8 yellow blocks will sync together two adc boards, but both adc boards must be the same. the yellow block initialization checks the clock output from both adc's and resets one of the adc's until both clocks are synced up. best wishes, dan On Fri, May 3, 2013 at 12:01 PM, <[email protected]> wrote: > I am sorry I didn't check my email earlier. > I thought I would need a special connection > between the two ADC boards for such sync. I > originally planned to connect the clock to > the clock inputs of both ADC boards, but > then realized that one ADC could generate > the FPGA clock but the other may be out of > sync with the FPGA clock. Do the yellow > blocks actually handle this problem? How do > I properly connect an oscillator to the > clock inputs of two ADC boards? I have not > yet decided which of two ADC-board types to > use. > > > hi ron, > > > > as far as i know, there's no yellow block that > > will sync up two different adc boards. > > you'd have to modify the yellow blocks to do this. > > > > there are yellow blocks that will sync up a pair of > > ADC2x1000-8's, or a pair of ADC1x3000-8's. > > > > best, > > > > dan > > > > On Tue, Apr 30, 2013 at 1:06 PM, <[email protected]> wrote: > > > >> I want to know how to clock two ADC > >> boards on one ROACH (1) board so they > >> will be in sync with the ROACH clock > >> which is taken from one ADC board. > >> We have two ADC boards: an old iADC > >> ADC2x1000-8 board and an ADC1x3000-8 > >> adc083000 board. We use these because > >> even the old versions of the CASPER > >> library have yellow blocks for them. > >> The ADC1x3000-8 board is missing its > >> J2 connector (a common omission) but > >> can easily have one installed. The > >> old iADC board seems to have all its > >> connectors. I operate at 2 GHz ADC > >> clock and 250 MHz ROACH clock. We > >> plan to buy another of one of these > >> boards so we operate with identical > >> ADC boards. > >> > >> In the past, I did not need the two > >> ADC boards synchronized. Soon we will > >> need to have two synchronized boards > >> running on one ROACH board. Have any > >> of you had success running two of > >> either of these ADC boards in sync? > >> > >> > >> > >> > > > > >
