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LTC2295' DA[13] is low

I use the LTC2295 to sample a sine wave with a frequence of10khz,and a Vpp of 500mV,but I find the DA[13]stay 0,while DB[0:13] ,DB[0:12] pins are  good,and I find same chips' DA[13] pins are good,and some are not.I wonder what makes it.my Schematic is like this:R228,R230 are not used.

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