Method to address 32 or more ADCs on the same SPI bus?

Hello,

I have a customer that is currently looking into an ADC of 10 or 12 bit resolution which will operate at pretty low speed and utilize an I2C
interface.

We have alot of parts that fit the basic requirements, but what's tricky is that they need to address 32 of them or possibly even more on the same bus, so they need a method to provide/utilize a 5 or 6 bit address. 

I see lots of ADC that fit the resolution/speed/interface requirement, but they all seem to utilize 2 or 3 bit addressing.

Has this issue come up in the past? Is there a way to address 32 or more ADCs on the same SPI bus?

Thanks in advance for your help.

Mike

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  • 0
    •  Analog Employees 
    on Sep 9, 2013 3:46 AM over 7 years ago

    Hi, Mike.

    Would the customer need 32 individual ADCs or can he make use of multichannel ADCs? We have the AD7997/AD7998, ADCs with 8-channels and have an I2C compatible interface. These parts have 2 versions and by giving different addresses for the two versions, up to five AD7997/ AD7998 devices can be connected to a single serial bus, or the addresses can be set to avoid conflicts with other devices on the bus. See the Serial Interface section of the datasheet for more information.

    Let me know if this helps.

    Thanks,

    Karen

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  • 0
    •  Analog Employees 
    on Sep 9, 2013 3:46 AM over 7 years ago

    Hi, Mike.

    Would the customer need 32 individual ADCs or can he make use of multichannel ADCs? We have the AD7997/AD7998, ADCs with 8-channels and have an I2C compatible interface. These parts have 2 versions and by giving different addresses for the two versions, up to five AD7997/ AD7998 devices can be connected to a single serial bus, or the addresses can be set to avoid conflicts with other devices on the bus. See the Serial Interface section of the datasheet for more information.

    Let me know if this helps.

    Thanks,

    Karen

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