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ADS8327 interface with SPI

Other Parts Discussed in Thread: ADS8327

I applied following configuration to ads8327 but i didn't get EOC signal. its remains at high;

VA=3.3V, Vref(+)=2.5V, vref(-)=0v(gnd), vin(uni-polar)=0 to 2.5v

i tied sdi pin to 3.3v  to use adc in default mode(and read while converting).  i applied convst signal(low for 80ns and high for 2.1us) and applied cs_bar signal(and sclk) after 40ns from falling edge of convst signal continuously. frequency of sclk is 25Mhz.

my problem is i'm not getting the conversion signal. i always remains at high. i not able to find out what is wrong ?

it is problem with IC or configuration or what ?