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how to test digital part of a mixed signal IC?

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wwfhm2002

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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?
 

Hi,

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
 

you can add some io pin for your digital part, so you can test the digital circuit using digital logic testing method.
 

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?
 

It is an internal sample clock ?
if yes, route the digital clock to a digital input pin
 

you may list the alll feature on your digital logic , part and desiogn the testcase, and write the testbench to test them.
 

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