Hi Khoi, If you modify the ADC's clock frequency, then the output data rates will scale linearly. So for example, with an 8 MHz clock all of the (7.68 MHz specified) data rates will increase by a factor of 8/7.68 = 1.0416 ( 5 SPS => 5.208 SPS, 10 SPS => 10.416 SPS, etc.) NOTE: The clock input for the ADS1257 is not meant to drive a crystal! This ADC expects a buffered clock signal (i.e. the output of a "crystal oscillator", also sometimes just called an "oscillator"). If you wanted to use a crystal, then you would need to pair it with a crystal driver (for example, www.ti.com/.../SN74LVC1GX04) before providing the signal to the ADS1257 . Best regards, Chris
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