CD4047&CD4066's ground pin connection

Adam Yao

Other Parts Discussed in Thread: SN74LV123A

Hi,TI expert

I'm designing a simple data aquisition system inculing switches within it,CD4067 and CD4066.In my design,CD4067 is used as a mux ,switching mutiple-channel signals to ADC,and CD4066 is used to select gains connecting four feedback resistors.It's part of a PGA amplifying circuit.As we know,we usually try to reduce interferences and noises by keeping the analog supply and ground seperated from the digital power and ground. The two devices mentioned above would pass analog signals and are controlled by a MCU.So,i'm puzzled that how i can manage their power and ground pins,connecting them to digital power and ground,or analog power and reference?And Why?

thanks,

best regards

Adam

over 14 years ago

0 Chris Cockrill over 14 years ago

TI__Mastermind 46480 points

The grounds for the CD devices should be to the digital power and gnd. The reason is the control pins need a clean digital signal.

0 Iriv B.K. over 13 years ago in reply to Chris Cockrill

Prodigy 20 points

Greeting: Hello, my question is about the CD4047, I need an integrated equal, having the same functions, since in this area can not find it, for which I can replace it, I need a CMOS LOW-POWER MONOSTABLE / ASTABLE MULTIVIBRATOR is all thank you.
Att: Kenndra
Kenndra.sj @ gmail.com

0 Chris Cockrill over 13 years ago in reply to Iriv B.K.

TI__Mastermind 46480 points

Here are a couple of choices.

SN74LVC1G123

SN74LV123A

0 Iriv B.K. over 13 years ago in reply to Chris Cockrill

Prodigy 20 points

Greeting: Hello, thanks for the information, only that I was not able to interpret the data sheet SN74LV123A because it has 16 pins, and I need 14, will continue to seek another method, thanks.

Logic

Logic forum

CD4047&CD4066's ground pin connection