AD7719: Clock driven from the port pin

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Accepted Answer

Question Can the clock be driven from the port pin of a micro? Answer You can use a port pin to drive the PLL, the frequency needs to be 32kHz. The 
 PLL circuit operates over a wide tolerance >+/-20%. Clock jitter on the clock 
 is not critical in most sigma delta ADC; the high oversampling ratio and 
 decimation effectively eliminate any error due to clock jitter. 
 
 However, frequency drift over time and temperature can be critical. Any change 
 in the input clock will directly influence the output update rate, position of 
 the notch in the digital filter and cutoff frequency. SO you should ensure that 
 frequency drift is minimized.
 
 One further point is that the AD7719 expects to be drive from a continuous 
 clock source. Use the power down options to minimise power consumption, don’t 
 be tempted to stop the clock .

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AD7719: FAQ