I have LT1019ACN8-5 IC output is 5V. I am using this IC to get Vref 3.3 for the ADS8320. is it ok if i use a voltage divider to the output pin to regulate 5v to 3.3v. Is it acceptable ?
The reference input of the ADS8320 draws varying current depending on the sample rate, like many ADC converters without reference buffers.
At, say, 25uA, a source resistance of only 2 ohms will result in 1 lsb of change in reading due to the reference current. It's usually best to use a buffer that has low noise output. Sometimes this is surprisingly expensive to do right, although fortunately it's only 16 bits.