ADS7952-Q1： ADC sampling accuracy for ADS7952

user5010820

Part Number: ADS7952-Q1
Other Parts Discussed in Thread: ADS7952

HI,TI

In the process of using ADS7952, I found that his sampling accuracy was very poor, as shown in the table, the error was unacceptable

输入电压
	CH11	理论换算	实际读取	实际采集值	CH10	理论换算	实际读取	实际采集值
0.837		169.2414	161.7	0.799703264		135.594	135.8	0.838271605
1.151		232.7322	222.4	1.099901088		186.462	187	1.154320988
1.513		305.9286	303.3	1.5		245.106	245.4	1.514814815
1.934		391.0548	384.2	1.900098912		313.308	314.4	1.940740741
2.411		487.5042	485.3	2.400098912		390.582	392.1	2.42037037
2.708		547.5576	545.9	2.699802176		438.696	441.1	2.722839506
3.172		641.3784	626.8	3.099901088		513.864	515.5	3.182098765
3.735		755.217	748.2	3.700296736		605.07	606.5	3.74382716
4.236		856.5192	849.3	4.200296736		686.232	667.5	4.12037037

clipping

over 7 years ago

0 Sandeep Kasargod over 7 years ago

TI__Expert 4405 points

Hello Clipping,

Welcome to the TI E2E Forum !

The ADS752 operates in two possible Vref range settings. I am not able to match your theoretical conversion to either range. Could you please share the measured Vref reference voltage and the Range setting used in your design?

Thanks.

Regards,

Sandeep

0 user5010820 over 7 years ago in reply to Sandeep Kasargod

Prodigy 50 points

Thank you,Sandeep!

I know why it wrong,Data type conversion leads to distortion.

Next question:I have about 400mv burrs on GND, which causes the ref-voltage to also have burrs. How can I filter the hair out?

I use REF5025 chip.

Clipping

Data converters

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ADS7952-Q1： ADC sampling accuracy for ADS7952