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TLC7528 Dual DAC Outputs not operating the same

Prodigy 20 points

Replies: 2

Views: 740

I am using both DACs in a TLC7528 and I am not seeing the same output characteristics on both DACs.  I am updating DACA and DACB 250 nanoseconds apart at a 1Khz rate.  My test case is setting both DACs from all 0's to full scale.  VDD=+5V and both reference voltages are -6V.

DACA transitions to full scale in ~1usec but DACB takes much longer ~200usec to eventually transition to full scale.

I believe I am meeting all of the setup and hold time requirements of the device per the data sheet but I could not find any specification about time between DACA and DACB updates.

Has anyone used the TLC7528 or similar device that could help?

2 Replies

  • Hi Donald,

    What is the output load on the individual channel outputs. That usually plays a role in the slew and settle time.

    Regards,

    Tony Calabria

  • In reply to Tony Calabria:

    Hi Tony,

    Thanks for replying.  I guess I forgot to mention that the output load for each dac channel is an identically configured inverting opamp (OPA627). 

     

     

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