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I want 4 bit digital input for presetting of counter 74ls192.How can I do such task using Analog to digital converter? Is there any specific IC available for 4 bits ADC? Or do i need to design ADC using comparator and resistors? THANK YOU!

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You probably can't buy an off-the-shelf 4-bit ADC. But you can buy an 8-bit parallel-out ADC and just ignore the 4 lsb's of the output.

That will almost certainly be cheaper (in money, board area, and power) than building your own 4-bit ADC from comparators.

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The simplest solution would be to use the four most-significant bits of an 8-bit ADC.

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Figure 1. 8-bit ADC with oscillator based on the TI ADC0804. Source: Electro-Tech Online.

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