Level 4
Level 4
Distributor - Changnam (South Korea)

The CYT2B9 datasheet mentions the ADC total error specifications as below:

1. What does Total error mean?
Does total error mean that Quantization error, Offset error, Gain error, INL (Integral nonlinearity), and DNL (Differential nonlinearity) are all reflected?

2. What is the difference between A_TE and A_TEB?
If I use an ADC without offset and gain adjustments, will the ADC error have A_TEB (+/-12LSB)?

e.g. If the ADC input range is 5V, 1LSB=5V/4095 = 1.221mV
3-1. After offset and gain adjustment, the ADC has an error of +/-5LSB. i.e., +/-6.105mV
3-2. If I just use the ADC without performing offset and gain adjustment, the ADC has an error of +/-12LSB. i.e., +/-14.652mV

Thanks and Regards,
YS

1 Solution

Moderator
Moderator

Hi @YongseokJeon ,

Q. What does Total error mean?
Does total error mean that Quantization error, Offset error, Gain error, INL (Integral nonlinearity), and DNL (Differential nonlinearity) are all reflected?

>>Yes, your understanding is correct. In the datasheet, the total error is specified with two SID parameters: SID109(A_TE) and SID109A(A_TEB). The total error consists of gain/offset and INL/DNL.

Q. What is the difference between A_TE and A_TEB?

A_TE:  The parameter used for "total error" after offset and gain adjustment at 12-bit resolution mode is the one that obtained after compressing  offset and gain errors.

A_TEB: The parameter used for "total error" before offset and gain adjustment at 12-bit resolution mode.

Q. If I use an ADC without offset and gain adjustments, will the ADC error have A_TEB (+/-12LSB)?
e.g. If the ADC input range is 5V, 1LSB=5V/4095 = 1.221mV
3-1. After offset and gain adjustment, the ADC has an error of +/-5LSB. i.e., +/-6.105mV
3-2. If I just use the ADC without performing offset and gain adjustment, the ADC has an error of +/-12LSB. i.e., +/-14.652mV

>> I am discussing with my internal team regarding this question. I will provide you with an update soon.

Thanks,
Shubham

3 Replies

Moderator
Moderator

Hi @YongseokJeon ,

Q. What does Total error mean?
Does total error mean that Quantization error, Offset error, Gain error, INL (Integral nonlinearity), and DNL (Differential nonlinearity) are all reflected?

>>Yes, your understanding is correct. In the datasheet, the total error is specified with two SID parameters: SID109(A_TE) and SID109A(A_TEB). The total error consists of gain/offset and INL/DNL.

Q. What is the difference between A_TE and A_TEB?

A_TE:  The parameter used for "total error" after offset and gain adjustment at 12-bit resolution mode is the one that obtained after compressing  offset and gain errors.

A_TEB: The parameter used for "total error" before offset and gain adjustment at 12-bit resolution mode.

Q. If I use an ADC without offset and gain adjustments, will the ADC error have A_TEB (+/-12LSB)?
e.g. If the ADC input range is 5V, 1LSB=5V/4095 = 1.221mV
3-1. After offset and gain adjustment, the ADC has an error of +/-5LSB. i.e., +/-6.105mV
3-2. If I just use the ADC without performing offset and gain adjustment, the ADC has an error of +/-12LSB. i.e., +/-14.652mV

>> I am discussing with my internal team regarding this question. I will provide you with an update soon.

Thanks,
Shubham

Level 4
Level 4
Distributor - Changnam (South Korea)

Hi, Shubham.

Please check if my understanding of Q3 is correct.

Thanks and Regards,
YS