Looking for < $5 daisy-chainable ADC

[Daniel Zetterman]

Does anyone know of a ADC that meets below specs?

* Daisy-chainable
* SPI
* 8 bit
* >= 100 ks/S
* 8 channels
* Single-ended
* Cost less than $5

 

[dorke]

You left out the most important parameter
What is the resolution you need?

 

[Daniel Zetterman]

You left out the most important parameter
What is the resolution you need?

Sorry for that, its 8-bit

 

[(*steve*)]

when you say "daisy chainable", do you mean that multiple can be connected to the same spi bus?

 

[Daniel Zetterman]

when you say "daisy chainable", do you mean that multiple can be connected to the same spi bus?

Yes, so that both the config bits can be transferred to all the ADC:s in the chain, and data bits can be clocked back to the SPI master from all ADC:s.

Like this: http://www.ti.com/lit/an/slaa296/slaa296.pdf

But with a cheaper ADC

 

[(*steve*)]

ah, I see. It looks like it would require a fair amount more logic on the chip as well as more pins.

I'm not surprised the chip implementing it is not cheap.

but knowing exactly what you want may help people in the know help you.

 

[(*steve*)]

googling revealed several alternatives, but the cost (even in quantity) of the ones I checked were well above your price point.

 

[Daniel Zetterman]

googling revealed several alternatives, but the cost (even in quantity) of the ones I checked were well above your price point.

Hmm, I will have a look if I can throw in a SPI controlled MUX to select the correct ADC.
So much for elegant modular solutions

 

[dorke]

Is I2C an option?
Can make life easier with multiple devices.