hi everyone:i try to use max10 on chip adc to sample a image sensor output. the frequence is 1MHz. i need to know when the max10 on chip adc switch from sample to the hold mode. in most adc, this is controlled by the CONVST signal. acctually i can test the sample point by 1.applying a 1MHz sin signal to the adc input, 2.set the adc sample frequence to 1MHz, the adc will generate a valid signal every 1μs 3.put the sin signal and the adc valid signal on the oscilloscope 4.figure out the relationship between valid signal and the sample point. the problem is : 1. i can not get the precise result 2. i can not make sure every max10 has the same result but i still want to find the relationship between valid signal and the sample point on manual.
i use my method to test the sampe point on MAX10_10M08_Evaluation_Kit,the result shows in sample_point.jpg be careful, it is 5*clock_clk not 5* adc_pll_clock_clk! the test condition is: 1. only use adc channel 1 2. 1MHz speed as follows: http://www.alteraforum.com/forum/attachment.php?attachmentid=12960&stc=1 http://www.alteraforum.com/forum/attachment.php?attachmentid=12961&stc=1