I have a project that uses a very low offset voltage op-amp as a preamplifier and the buffered output from this is passed to an ADS1230 AD converter chip.
Currently I'm using 16 bits of the 20 bit output and passing the digital stream via an 8 bit SPI to a 16 bit controller chip. The SPI is running at 615KHz.
The digital link between the AD converter and the computer board is done with a flexible unshielded multi-stranded cable 10 cm long.
I don't come from a digital background so I was shocked to find that I get noise when I wiggle the cable - I am stuck with the arrangement but I would like advice on the best configuration for the cable - obviously I can shield it but would there be a benefit in using a USB type cable for the clock and the data line? Or having them in a shielded twisted pair? Obviously I'd like to use the full 20 bits.
Currently I'm using 16 bits of the 20 bit output and passing the digital stream via an 8 bit SPI to a 16 bit controller chip. The SPI is running at 615KHz.
The digital link between the AD converter and the computer board is done with a flexible unshielded multi-stranded cable 10 cm long.
I don't come from a digital background so I was shocked to find that I get noise when I wiggle the cable - I am stuck with the arrangement but I would like advice on the best configuration for the cable - obviously I can shield it but would there be a benefit in using a USB type cable for the clock and the data line? Or having them in a shielded twisted pair? Obviously I'd like to use the full 20 bits.
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