ADS8528: some questions

Noriyuki Takahashi

Genius 10460 points

Part Number: ADS8528

Hi team

There are some quesitons.

1. When they use the internal reference, should REFIO-pin be open?

2. Are there any restriction of DVDD power sequence?

Regards,

Noriyuki Takahashi

over 2 years ago

0 Tom Hendrick over 2 years ago

TI__Guru**** 176331 points

Hi Takahashi-san,

You need a bypass cap on the REFIO pin of the ADS8528 (see page 8). There are no power sequence restrictions, please refer to the top of page 46 for details.

0 Noriyuki Takahashi over 2 years ago in reply to Tom Hendrick

TI__Genius 10460 points

Hi Tom,

Tom Hendrick said:
You need a bypass cap on the REFIO pin of the ADS8528 (see page 8).

What is the recommended value of the bypass cap? I can't see it on the datasheet.

The following is an additional question.

They think ASLEEP, HW/SW, PAR/SER, REFEN/WR and STBY would be connected to DVDD or DGND. Can they connect these pins to DVDD or DGND directly? They want to know whether they need to add any things like resistors between these pins and DVDD or DGND.

Regards,

Noriyuki Takahashi

+1 Tom Hendrick over 2 years ago in reply to Noriyuki Takahashi

TI__Guru**** 176331 points

Takahashi-san,

REFIO uses 0.47uF. The control pins could be tied directly to power or ground if they prefer not to use pull up/down resistors.

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ADS8528: some questions