ADS5295: Question about ads5295 14x capture mode.

sungsik kang1

Part Number: ADS5295

Hi. I already posted several question about ADS5295. But I'm asking because there's still something I'm not sure about.

Q1. when I set 14x serialization mode and disable filter (like averaging..), where does two zero bit are added? to MSB? LSB?

for example 12bit (include information) is 111000111000 -> To LSB :111000111000+00

To MSB :00+111000111000 which one is correct?

Q2. When I set 14x serialization mode and sync pattern mode,

Two zero bit are added like question 1 (like (00)111111000000, 000000111111(00)?) or sync pattern become 11111110000000?

Thanks!

over 5 years ago

0 Chen Kung over 5 years ago

TI__Genius 12025 points

Hi,

Thank you for using ADS5295 device.

we will reply your question very soon.

Thank you!

Best regards,

Chen

0 Chen Kung over 5 years ago in reply to Chen Kung

TI__Genius 12025 points

Hi,

To easy to explain your question

here are two examples:

1) for 12bit device to 14x serial

data from 00xxxxxxxxxxxx to xxxxxxxxxxxx00

2) next question will be explained using Ramp

from 00High~Low

to High~~~Low (no zero been shown)

Hopefully you can see the same thing.

Thank you!

Best regards,

Chen

0 sungsik kang1 over 5 years ago in reply to Chen Kung

Prodigy 160 points

@chen kung

thanks for reply.

About question1, in your example, when 12x serialization mode, adc output is xxxxxxxxxxxxx(12bit, except zerobit).

when 14x serialization mode, adc output is xxxxxxxxxxxx00(14bit, include zero bit)

Is it right?

0 Chen Kung over 5 years ago in reply to sungsik kang1

TI__Genius 12025 points

Hi,

for your question 2:

from 12x serialization mode to 14x serialization mode on SYNC Pattern:

is changed from: 00111111 10000000 to 11111111 00000000

Thank you!

Best regards,

Chen

0 Chen Kung over 5 years ago in reply to Chen Kung

TI__Genius 12025 points

Hi,

Also your question is correct!

Thank you!

Best regards,

Chen

0 sungsik kang1 over 5 years ago in reply to Chen Kung

Prodigy 160 points

Thanks. it is my last question.

If I want to capture 1111111 0000000 sync pattern on 14x serialization, which register setting have to be done among enable sync pattern and 14x serialization mode?

0 Chen Kung over 5 years ago in reply to sungsik kang1

TI__Genius 12025 points

Hi,

Yes, please also look at the ADS5295 datasheet starting from page 30.

please choose from Register 0x25 on TEST_PATT(2:0)

you can select TEST_PATT2, TEST_PATT1, or TEST_PATT0

also only page 31 Register 0x46 please make sure ENABLE_46 is ON

select BIT_SER_SEL to be 0100 (as 14x mode enable)

and also choose EN_2WIRE to be 0

Thank you!

Best regards,

Chen

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ADS5295: Question about ads5295 14x capture mode.