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LTC 2185 level noise

Category: Hardware
Product Number: LTC2185

Hello,

   I use ADC LTC2185-16 bit and 122 MHz clock  with jitter according datasheet < 30 fs. Front-end circuit for input signal is similar to recommended by datasheet LTC2185 for frequencies from 5 MHz to 150 MHz. Without input signal, ADC gives noise on level approximitly 5 LSB bits (without any filters). Is this noise level correct ?     

Thanks, Piotr.