Goodmorning,

for a project I have to design a pcb which also include the ads1220 to transform analog into digital signal.
In order to do this I have to reproduce the breakout board for the ads1220.
I found this online, can i trust it? what does it mean by 47R? how canI create AGND and GND? I have to create 2 ground plane, one AGND and one GND and then connect it by 0R? thanks

 

circuits found online are nice but need to be taken with a grain of salt. i strongly suggest to always check the datasheets.
in this case product of interest is not showing full part number so pinout may not work for variant you plan on using. that schematic seem to be for TSSOP variant and not for VQFN.

and you are right about GND planes.

47R means 47 ohm.
47k means 47kOhm etc.

 

circuits found online are nice but need to be taken with a grain of salt. i strongly suggest to always check the datasheets.
in this case product of interest is not showing full part number so pinout may not work for variant you plan on using. that schematic seem to be for TSSOP variant and not for VQFN.

and you are right about GND planes.

47R means 47 ohm.
47k means 47kOhm etc.

thank you, I also checked datasheet and I found this which seem pretty similar to what was in that page:


but I also found this whichisreally different from that in the TI datasheet I found this but has no number for resistance or capacitator value:
So I don't know what to use and the only one for which I know the value is the simplified one; would it work?

 

I found this online, can i trust it?

Probably not. It has the CLK line shorted to ground.

I'd never trust a schematic that was drawn so poorly. Text over components/wires is a no-no and colored schematics look childish.

 

Probably not. It has the CLK line shorted to ground.

I'd never trust a schematic that was drawn so poorly. Text over components/wires is a no-no and colored schematics look childish.

Hi, thanks for your answer, if you see my reply also in the datasheet they put something like this.
maybe they took inspiration from this?

 

that is from the datasheet so yes you can trust it. but... keep in mind that same IC can have different packages and pinouts.
two pictures shown in #3 are examples for different packages.

SCLK is serial clock for SPI interface,
CLK is option for external clock and it is normally tied to DGND

 

that is from the datasheet so yes you can trust it. but... keep in mind that same IC can have different packages and pinouts.
two pictures shown in #3 are examples for different packages.

SCLK is serial clock,
CLK is option for oscillator.

I'm using it for a piezo sensor, what you suggest to use? thanks

 

what kind of "piezo sensor"? you need to provide details

 

just a note to get n bit conversion accuracy you need to sample n+1 bits coz if the LSB is unknown then both 0.1 and 0.0 round to 0
if the n is large it has less significance of course