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ADS1244: Using 1 Voltage Reference IC for 2 ADCs

Jejomar Ildefonso
Expert 8820 points
Part Number: ADS1244
Other Parts Discussed in Thread: REF3425, ADS124S06

Hi Team,

Our customer intends to use a 2.5V voltage reference for 2 ADS1244. Do we need to use DC/DC converter or can we directly use one of our voltage reference ICs?

If the voltage reference IC is the recommend approach, we're looking at the REF3425. In this case would it be fine to use a single REF3425 as a voltage reference for two ADS1244?

Thanks in advance!


Kind Regards,

Jejomar

  • +1
    TI__Mastermind 40191 points

    Hi Jejomar Ildefonso,

    Is the customer interested in a newer ADC? The ADS1244 is a good part, but we have newer generation version of this device that might be interesting. For example, the ADS124S06 is our latest generation device, which offers more features and better performance. Let me know if the customer would consider reviewing our more recent ADC portfolio.

    The customer should use a discrete low noise voltage reference for the ADS1244. DC/DC converter switching frequencies can couple into the ADC and cause additional noise in the measurements. A DC/DC should at least have an LDO on the output to clean up the power supply.

    A single REF3425 should be able to drive 2x ADS1244s. The ADS1244 VREF input impedance is specified at 1Mohm, while the REF3425 has a 10mA output drive capability. However, I have never tested such a configuration so I cannot be 100% sure it will work. In theory it should though.

    -Bryan