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Original question:

ADS8689: ADS8689 Implementation

ADS8689:Io max for VOH/VOL of SDO

ttd
Mastermind 9315 points

Part Number: ADS8689

Dear Technical Support Team,

Q1.

Could you tell me the maximum Io values for the “SDO pin” and “GPO pin.”?

Since the datasheet only listed the conditions mentioned below.

 I could not find any information in the datasheet regarding the maximum current that can be carried by the SDO pin. 

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Q2

I am considering using the SDO pin output to drive a photocoupler, but since the maximum current that the SDO pin can handle is unknown, I am considering adding a buffer circuit. 
If I were to add a buffer circuit such as SN74LVCxx, is there a recommended circuit configuration? 

Q3

If I were to add a capacitor to reduce noise on the SDO output pin, are there any recommended capacitor values?

Best Regards,

ttd
　　  

  • 0
    TI__Expert 7510 points

    Hello ttd, 

    Those are the max values ±500μA

    For driving a photocoupler or something that requires higher current to drive, I would agree with the buffer/driver addition. 

    We typically recommend a resistor in series, something like a 22Ω or 33Ω, but if a capacitor is preferred I would recommend something small, ideally something less than 22pF.  

    Best regards, 

    Yolanda