ADS1278 Timing for High Speed Operation & IOVDD @ 2.5V

Don Ransbury

Other Parts Discussed in Thread: ADS1278

I would like to Interface to the ADS1278 in High Speed mode with a 37Mhz (27ns period) clock freq. Page 9 of the data sheet specifies a 21ns prop delay with IOVDD at ~3.3volts and DVDD at 2.1. I would like to operate with IOVDD at 2.5volts. From the data sheet I see we get about a 6 ns setup and 10 ns hold time with a 27ns SCLK period. What will the part provide at IOVDD of 2.5V? What is the 31ns timing value for tdopd in the timing table?

over 12 years ago

0 Tom Hendrick over 12 years ago

TI__Guru**** 180751 points

Hi Don,

The 31ns t_DOPD listed on page 9 of the ADS1278 data sheet represents the MAX prop delay for the IOVDD and DVDD values shown at the top of the table over the -40 to +105`C range. We'll see if we can get some typical values for you with IODVDD = 2.5V. What temperature range do you expect your ADS1278 application to run in?

0 Don Ransbury over 12 years ago in reply to Tom Hendrick

Prodigy 70 points

Thank you for your help Tom. I expect that the application requires commercial temp range 0 - 70deg C. Ambient will be below that, but the environment is sealed. As you can see, running the ADS1278 at 37Mhz, the 31ns figure presents a problem.

0 TI Lady over 12 years ago in reply to Don Ransbury

Genius 4025 points

I'm the local disti fae just watching the post to make sure we get all questions answered.
Thanks for the support Tom.

Amy

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ADS1278 Timing for High Speed Operation & IOVDD @ 2.5V