We are using AD7656 in software mode with parallel port. When we don't reset ADC the second sample is corrupted. Need we reset ADC after each sample?
A reset is required after the initial power up. Once this RESET has been applied the part should convert as normal. Can you elaborate on what you mean by 'corrupted' conversions? What is the analog input and the actual output code. What range have you selected. Can you indicate how you are configuring the device both through the register and also where you have the pins connected.
Have you probed the device pins to ensure that you are seeing the required voltages on the device pins.
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