built in adc in fpga????

Am Freitag, 8. November 2013 12:25:23 UTC+1 schrieb shrinivas gotur:

The only fpga with included ADC is microsemi fusion fpga. Guess it sells in too small numbers to see more devices of that kind in near future on market available.

Newer Xilinx devices (7-series) have built-in ADC's. You'd need to use some external parts to handle your 5V input range. These parts are not cheap, however. You'd probably do better with a cheap plain FPGA and a separate ADC chip. Look at Artix-7 for the least expensive of the lot.

To what end? An external ADC allows you to trade off speed/resolution/cost as necessary, and doesn't mean that your ADC is trying to share a substrate with tiny CMOS gates switching at hundreds of MHz. And for any moderate rate of throughput you can talk to it SPI for a cost of a whopping 4 pins.

You can build an ADC in an FPGA with decent performance. Look up DeltaSigma converters. Many FPGAs have differential inputs which can be used as an analog comparator. The rest is digital.

thanks guys for your time.actually i wanted to interface A real time lvdt with fpga so i was thiking of built in adc.

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