May 11, 2012 #1 D djnik1362 Full Member level 2 Joined Aug 9, 2010 Messages 136 Helped 1 Reputation 2 Reaction score 1 Trophy points 1,298 Location IRAN Activity points 2,374 hi This is timing diagram from ADS805 datasheet : I have 32 analog inputs that connected to a 32x1 analog multiplexer. My question is : With given timing diagram how can i read 32 analog channels ? I need to sample each channel at about 200KHz frequency. Thanks for your support.
hi This is timing diagram from ADS805 datasheet : I have 32 analog inputs that connected to a 32x1 analog multiplexer. My question is : With given timing diagram how can i read 32 analog channels ? I need to sample each channel at about 200KHz frequency. Thanks for your support.
May 12, 2012 #2 erikl Super Moderator Staff member Joined Sep 9, 2008 Messages 8,108 Helped 2,695 Reputation 5,370 Reaction score 2,305 Trophy points 1,393 Location Germany Activity points 44,123 djnik1362 said: I have 32 analog inputs that connected to a 32x1 analog multiplexer. With given timing diagram how can i read 32 analog channels ? I need to sample each channel at about 200KHz frequency. Click to expand... If 200kHz is your channel switching frequency, you've got 5µs/channel. And your ADS805 needs only 300ns per conversion, if I understand the timing diagram correctly. So there's plenty of time margin, isn't it?
djnik1362 said: I have 32 analog inputs that connected to a 32x1 analog multiplexer. With given timing diagram how can i read 32 analog channels ? I need to sample each channel at about 200KHz frequency. Click to expand... If 200kHz is your channel switching frequency, you've got 5µs/channel. And your ADS805 needs only 300ns per conversion, if I understand the timing diagram correctly. So there's plenty of time margin, isn't it?
May 12, 2012 #3 FvM Super Moderator Staff member Joined Jan 22, 2008 Messages 52,485 Helped 14,756 Reputation 29,794 Reaction score 14,121 Trophy points 1,393 Location Bochum, Germany Activity points 298,363 Although it's feasible in terms of ADC sampling speed, it's not so easy to achieve 12 bit accuracy with the multiplexer design.
Although it's feasible in terms of ADC sampling speed, it's not so easy to achieve 12 bit accuracy with the multiplexer design.