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AD7928 Track-and-Hold Acquisition Time

Hi, All!

The AD7928 ADC input is supplied with a pulsed signal of ~1us duration. The ADC will make a acquisition for 300 ns after falling edge of CS signal and then will do the conversion for several SCLK cycles. The changing the input signal after acquisition duration will not affect the result? Or do I need to put at ADC input an external device for sample-hold operation (as example AD783)?

Best regards