Thank you for this video! It's the best explanation of a successive approximation ADC I've seen (and I've been looking around quite a bit over the years).
Nice job, great demonstration, would make a great lab for a college student. It also gets across what "integration" is all about- replacing a board full of stuff with an IC. There was an old part back in the day, MC14549B that had all the SAR logic in it. They're still sold by Onsemi, available from Digi-Key. You would then add a parallel DAC (MC1408 back then), a comparator (LM311 back then) and have a 3 chip ADC. The other technique that's still practiced is to use a cheap microcontroller with a resistor DAC made from R on port pins. Some uC's have a comparator, so you could do a SAR with a $.50 uP and a pile of resistors. The SAR logic is pretty simple in software with comparisons and left shifts to build up your value. Have fun, Interesting.
Very cool and your drawings are cool. 8:29 i can't see how this 595 counts to 5, a other solution would be using CD4017 and tie the 5th or 9th pin to the reset input. The CD4017 also always starts with pin of bit 0 activated or CD4520 with CD4012 4 input NOR gate and tie this output to reset CD4520. PCM1808 (adc), PCM1725 (dac) both are 14 pin, 16 bit, 96kHz, dual channel. They are used in musical instruments, sound mixers, etc, no software setup needed.
@@AnalogDude_ wanted parallel output. Adc676 is the only 16 bit parallel output one but its too expensive. Cd4017 outputs go off after the next count reached and need it to stay on for the and gates. The master reset gets triggered on Q4 of the 595. The only issue is it needs to be inverted as it is active low.
@@igorbrichkov3632 I also was planning to use adc/dac chips, so i had their datasheets. I checked quite a few of them . also researched what to do with differential inputs, witch requires like 3 opamps. special power supply opamps for reference. In the end i settled for: Cirrus Logic CS4271. stereo input / output 192 khz. Recently i was watching the "service manual" of the Akai MPC3000 and found out about the "PCM" chips for output and Japanese AKM adc for input, they also produce high end audio codecs. but like the Cirrus chip, they need software setup to config. since they can be adjusted for 32, 24 or 16 bit and more.
![ประสบการณ์ จ้าง Developer ที่ผมจะไม่มีวันลืม [ภาค2]](http://i.ytimg.com/vi/pZbsSDRrmXA/mqdefault.jpg)
Great demonstration. So much memories.
Sad that soon will be harder and harder to tinker when all parts are more and more amd
Thank you for this video! It's the best explanation of a successive approximation ADC I've seen (and I've been looking around quite a bit over the years).
@@pdarkXIV thanks
Nice job, great demonstration, would make a great lab for a college student. It also gets across what "integration" is all about- replacing a board full of stuff with an IC. There was an old part back in the day, MC14549B that had all the SAR logic in it. They're still sold by Onsemi, available from Digi-Key. You would then add a parallel DAC (MC1408 back then), a comparator (LM311 back then) and have a 3 chip ADC. The other technique that's still practiced is to use a cheap microcontroller with a resistor DAC made from R on port pins. Some uC's have a comparator, so you could do a SAR with a $.50 uP and a pile of resistors. The SAR logic is pretty simple in software with comparisons and left shifts to build up your value. Have fun, Interesting.
@@johnwettroth4060 thank you
Very cool and your drawings are cool.
8:29 i can't see how this 595 counts to 5, a other solution would be using CD4017 and tie the 5th or 9th pin to the reset input.
The CD4017 also always starts with pin of bit 0 activated or CD4520 with CD4012 4 input NOR gate and tie this output to reset CD4520.
PCM1808 (adc), PCM1725 (dac) both are 14 pin, 16 bit, 96kHz, dual channel.
They are used in musical instruments, sound mixers, etc, no software setup needed.
@@AnalogDude_ wanted parallel output. Adc676 is the only 16 bit parallel output one but its too expensive.
Cd4017 outputs go off after the next count reached and need it to stay on for the and gates.
The master reset gets triggered on Q4 of the 595. The only issue is it needs to be inverted as it is active low.
@@igorbrichkov3632 you could try and clock this PCM1808 (or another chip) 16 times and shuffle the output into 74hc595 to get parallel out.
@@igorbrichkov3632 ... or maybe: ADS8867
100ksps, 16 bit, non audio. no software but with a conversion indicator input.
@@igorbrichkov3632 I also was planning to use adc/dac chips, so i had their datasheets.
I checked quite a few of them .
also researched what to do with differential inputs, witch requires like 3 opamps.
special power supply opamps for reference.
In the end i settled for: Cirrus Logic CS4271.
stereo input / output 192 khz.
Recently i was watching the "service manual" of the Akai MPC3000 and found out about the "PCM" chips for output and Japanese AKM adc for input, they also produce high end audio codecs. but like the Cirrus chip, they need software setup to config. since they can be adjusted for 32, 24 or 16 bit and more.