ADS131A04: Unipolar Analog supply ADS131A04

zbyno brudny32

Part Number: ADS131A04

Hi,

I want to ask about Fig 111 ..page 81

I want to use ADS131 with AVss on GND AVdd=5V Vrefex= +5,000V IOVdd= 3.3V

I found for this case the example figure 111 wrong : It should be AVSS and VNCP on Ground and AVDD should be wired on +5V

correct?

best regards

zbyno

over 8 years ago

0 Brian Pisani over 8 years ago

TI__Mastermind 38745 points

Zbyno,

You are correct. One of those diagrams should show a unipolar supply configuration. Thanks for letting us know. I will work to get that updated.

Brian

0 zbyno brudny32 over 8 years ago in reply to Brian Pisani

Prodigy 210 points

Hi Brain,

1. Thank you fo your answer...

2. Can ADS131A04 work with Fmod 4,8MHz? With Fin = 19.2 MHz

I need to have Fdata .....100 kSmpl by OSR 48.. see table3 on page 22

thanks

zbyno

0 Brian Pisani over 8 years ago in reply to zbyno brudny32

TI__Mastermind 38745 points

Zbyno,

Yes that is possible. If you had a 19.2 MHz clock source, set CLK1 = 0x01 (fICLK = 9.6 MHz), CLK2 = 0x27 (fMOD = 4.8 MHz, Data rate = 100 kSPS).

In general, any combination of external clock frequencies in the range on page 7 with any clock divider/OSR combination determined in the CLK1 and CLK2 registers is allowable. There may be several ways to get a 100 kSPS data rate.

Regards,
Brian Pisani

0 zbyno brudny32 over 8 years ago in reply to Brian Pisani

Prodigy 210 points

thank you Brian
will be then parameters of measurement with Fmod=4,8 MHz: I ask for : ENOB, noise etc worse than by Fmod=4,096 MHz? How much?
best regards
zbyno

0 Brian Pisani over 8 years ago in reply to zbyno brudny32

TI__Mastermind 38745 points

Zbyno,

I don't have any data to provide, but I can tell you from my understanding of the design that the noise, dynamic range, ENOB, etc. will be very very close to what is listed for the OSR 48 data in Tables 1-4 in the datasheet.

Regards,
Brian Pisani

Data converters

Data converters forum

ADS131A04: Unipolar Analog supply ADS131A04