Band bandwidth SMU for FPGA chassis

I'm specing on material for an FPGA FlexRIO system. The module FPGA and adapter, we will use has already been defined, a 7975R and a 5782. For our application, we will be streaming 2 inputs analog on a RT controller attached. From my understanding, these samples will be single precision floating point numbers, each of which is a piece of 4 bytes. Assuming that the 5782 max sampling rate is used, 250 MECH. / s, I think that I will need 2 GB/s of bandwidth on my SMU chassis.

Here my question, then, what SMU chassis should I consider? The SMU-1082 has "up to 2 GB/s per-slot dedicated bandwidth", but it is a real or theoretical number? Normally, I would just get the next thing that high, just to be sure, but there is a significant price difference on the way to the SMU 1085, which is also much larger I need. So I would like to save space and several thousands of dollars if I could get away with a 1082. Sampling does not quite to the max modules of adaptation would be acceptable, but I would be interested to know where about my maximum sampling speed would be.

Thanks in advance for your help.

The 1082 has more than enough bandwidth to stream data at a time to the analog inputs of a 5782.  The 5782 has a 14 bit ADC with two channels that sample to 250 ms/s. These samples are returned as an I16 with the two least significant bits filled with zeros.

So assuming that you transfer all I16, rather than packing the 14 bits of data, you would have the following bandwidth requirements.

2 channels x 2 bytes/sample x 250 mega-samples per second = 1 GB/s

The 1082 a 2 GB/s of throughput dedicated per slot. The 7975 accommodates up to 1.6 Gbps streaming. I would recommend calling chat with someone, if you are looking for a recommendation on what type of chassis to purchase, but based on the requirements of streaming that you're fine with the combo 7975 and 1082, you thought. Just make sure you get a controller which can accommodate streaming speeds you're looking for. The 8840 is a good candidate.

Tags: NI Hardware

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