DAC121C085: VA Ramp-Up time?

Luke Park

Prodigy 425 points

Part Number: DAC121C085

There are rare I2C NACK from DAC121C085.

Customer have reported that if VA ramp up fast, it is ok, but there are NACK in case of slow Va ramp-up.

What is VA ramp up time? For example, VA 3.3V should be high in 1ms or 10ms.

I can't find out in datasheet.

Let me know soon. thanks.

over 7 years ago

0 Vishy Viswanathan over 7 years ago

TI__Mastermind 21685 points

Luke,
Please check Figure 19 of the DS. It shows a typical power-on reset time of the supply voltage.
Thanks,
Vishy

0 Luke Park over 7 years ago in reply to Vishy Viswanathan

TI__Prodigy 425 points

Hi, Vishy

Fig19 describe ramp up time is appox. 7ms. But I think there should be min value, like 10ms or 15ms.

[Q1] Do you have min max value?

[Q2] If it take 2~3sec for ramping up, device can work correctly?

Thanks

0 Vishy Viswanathan over 7 years ago in reply to Luke Park

TI__Mastermind 21685 points

Luke,
I checked about this
Q1: We don't have min/max number on the ramp up time.
Q2: Yes, device can work correctly with slow 2 to 3 sec VA ramp up.

Thanks,
Vishy

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DAC121C085: VA Ramp-Up time?