As now most chip are mixed-signal IC, which include ADC, digital block and DAC. So if ADC can't work, how can I verify my digital block, especially when ADC is customized sigma-delta ADC. I can't find a signal generator can generator sigma-delta ADC output, but PC can generate them, but how to feed this data to digital block?
If your chip have some digital I/O link and communication mean so you can implement test mode in your digital block. For example a test mode that route
a digital input to feed data to the digital block
thanks. But I think you miss the key problem. I know I can feed signal from digital I/O pin, but how to feed them? Because digital logic will sample input data at a constant sample rate, so who transimit the data to digital I/O pin with clock from digital part?