ADS124S06: ADS1x4S08 Evaluation Module

Weiming Han

Part Number: ADS124S06

Tool/software:

Hi Support Team,

I am working on the evaluation board of ADS124S06IRHBR and am wondering why there is a pull-down resistance on clock of 7W-4.096MBB-T(4.096 MHz XO (Standard) CMOS Oscillator) .

thanks,

Best Regards,

5 days ago

+1 Bryan Lizon86 5 days ago

TI__Mastermind 40061 points

Hi Weiming Han,

That resistor is a weak pull down to ensure the ADC powers up with the internal oscillator selected, as shown in the pin diagram

This resistor can be removed if you want to use an external clock

-Bryan

0 Weiming Han 4 days ago in reply to Bryan Lizon86

Prodigy 10 points

thanks Bryan, It is very helpful. I have one more question about this reference design too. what are D9 and D10 used for? thanks,

+1 Bryan Lizon86 4 days ago in reply to Weiming Han

TI__Mastermind 40061 points

Hi Weiming Han,

These diodes are used to protect the IDAC pins from an overvoltage event. In general just using resistors in series with these pins instead of diodes is a better way to limit the current into the device.

The resistors reduce the IDAC headroom a bit, but they can also limit the current in the case of both positive and negative overvoltages, while the diodes only protect against positive overvoltages

-Bryan

0 Weiming Han 4 days ago in reply to Bryan Lizon86

Prodigy 10 points

thanks Bryan, I got it.

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ADS124S06: ADS1x4S08 Evaluation Module