ADS7952: timing

Yes.

1.do you know what condition the max delay time will be?

2. our typical reading is 16ns, and maximum allowed delay is 19ns, would be issue?

Thanks, Aaron.

Hi Hailong,

The max delay td2 time for 3.3V is 27ns. 16ns will be fine. Where are you getting the 19ns max timing spec?

Regards,
Aaron Estrada

Hi Aaron,

19ns is from our tolerance analysis. it means the delay time over 19ns, it might mess up the application. so we would like to know the condition the maximum delay time happens.

Thanks,

Hailong Xu

09/30/2021

Hi Aaron,

19ns is from our tolerance analysis. it means the delay time over 19ns, it might mess up the application. so we would like to know the condition the maximum delay time happens. we'd like to know the risk.

Thanks,

Hailong Xu

10/01/2021

Hi Aaron,

my understanding is we can allow 19ns delay, but the part max delay is 27ns, so it would be mess-up the ADC results.

Thanks,

Hailong Xu

10/04/2021

Hello Hailong,

Understood. This is a characteristic of the part and the delay timing will vary from device to device. I don't believe there to be an exact condition for this max timing but this delay time has been measured over many devices and a device should never exceed this max timing. 

Regards,
Aaron Estrada

Hi Aaron,

Thanks, 

Do you have any idea what will affect the delay time? or in what condition the daly time might be maximum.

Hailong Xu

10/04/2021

Hi Hailong,

the level of VBD has an affect that is clear in the data sheet. VBD of 5V sets the max delay time to 17ns which would be the best option for you. Temperature may also affect this timing but it's hard to say how much of an affect it may have. 

Regards,
Aaron Estrada