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  • RE: INA125: Troubleshooting noise from INA125

    Resolved
    Hi Sandheep, Do you have any recommendations on low-noise regulators for this application? My PCB has both 5V and 24V available. If your 5Vdc and 24Vdc power sources are directly connected from wall wart adapter, you need to place some filters after the…

  • RE: ADS8861: Direct compatibility between LMH32401 and ADS8861

    Dear Keith, Continuation of my previous email. According to his datasheet, the short-circuit current limit (ISC) of the REF60xx family of devices is adjusted by connecting a resistor (RSS) on the SS pin. The short-circuit current limit when the REF60xx…
    • Answered

  • RE: ADS1256 reducing noise

    Resolved
    Hi Frank, If you calculate the standard deviation of your codes, this should give you the RMS noise value that you can compare to the noise tables for example. Please note that the values in the ADS1256's datasheet noise tables are taken with inputs shorted…
    • Answered

  • RE: ADS127L01: REF pins

    Resolved
    Hello Elisha, Thank you for your post. 10 uF is the minimum recommendation for total capacitance between REFP and REFN. The source of the reference voltage (REF6025) has additional bulk capacitance on the REFP node as well (22 uF). It's generally recommended…
    • Answered

  • ADS125H02: ideal Reference suggestion

    Resolved
    Part Number: ADS125H02 Other Parts Discussed in Thread: REF5025 , REF6025 Hello team, in evaluating the ADS125H02, if I wanted to add an external REF to the ADC, with a better Temperature drift, initial error, long term drift etc. which would you suggest…
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    • Answered

  • RE: ADS1271: ADS1271B - High noise levels in modulation output mode

    Resolved
    Hello Leonid, Are you using a reference buffer, similar to that used on the EVM? I took a quick look at the MAX6070 datasheet, and I doubt that it can directly drive the ADC REF inputs. If not using a buffer, you can follow figure 68 in the ADS1271 datasheet…
    • Answered

  • RE: ADS1256: Vref circuit for ADS1256

    Resolved
    Hi Mirtcho, The reference inputs on the ADC are switched-capacitor inputs which require a buffered reference source. Therefore, you would either need to add a buffer on the output of the reference or switch to a buffered reference, such as the REF602…
    • Answered

  • RE: ADS1256: ADC calibration advice

    Resolved
    Hi Niclas, One point of clarification here: the ADS1256 does not have an internal reference. You mentioned "less exact 2.5V reference inside the product", and I was not sure if "product" meant the ADS1256 or the board you are designing, so I just wanted…
    • Answered

  • OPA191: Reduce reference noise

    Resolved
    Part Number: OPA191 Other Parts Discussed in Thread: REF5025 , REF6025 Hi, I would like to reduce the reference noise of the underneath schematic. I tried to use the REF5025 (image under schematic) but according to TINA this only increases my output noise…
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    • Answered

  • ADS1271: ADS1271B Voltage Reference Question

    Resolved
    Part Number: ADS1271 Other Parts Discussed in Thread: ADS1261 , ADS1260 , REF6025 Hello -- I wanted to confirm that the ADS1271B will function with a VREF+ of 5.0 V VREF- of 0V, AVDD of 5.0 V and DVDD of 1.8/3.3V. The source of confusion is that under …
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