Linearity Analysis Tool; Figure 6-8. Linearity Analysis Tool; Table 6-2. External Source Requirements For Ads8332 - Texas Instruments ADS8332EVMV2-PDK User Manual

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6.5 Linearity Analysis Tool

The linearity analysis tool, shown in
nonlinearity (DNL) and integral nonlinearity (INL) plots over the entire code range for the ADS8332. A 1-kHz
sinusoidal input signal is required, which is slightly saturated (100 mV to 200 mV outside the full-scale range)
at the input with very low distortion. The external source linearity must be better than the ADC linearity. The
measured system performance must reflect the linearity errors of the ADC and must not be limited by the
performance of the signal source. Jumper JP1 must be put into position with the shunt on pins 1-2 to allow for a
common voltage of 0.2 V to be applied, thus allowing the inputs to be fully saturated. To make sure that the DNL
and INL of the ADC are correctly measured, the external source must meet the requirements in
Table 6-2. External Source Requirements for ADS8332 Evaluation
Specification Description
Signal frequency
External source type
External source common mode
Signal amplitude
Maximum noise
Maximum SNR
Maximum THD
The number-of-hits setting depends on the external noise source. For a 100-dB SNR external source with
approximately 30 µVrms of noise, the total number of hits must be 256.
This analysis can take a couple of minutes to run and the evaluation board must remain undisturbed
during the complete duration of the analysis.
SBAU251B – JULY 2017 – REVISED FEBRUARY 2023
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Figure 6-8, measures and generates the performance differential
Note

Figure 6-8. Linearity Analysis Tool

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ADS8332EVMV2-PDK Operation
Table
Specification Value
1 kHz
Single ended, referred to GND
2.25-V
4.2-V
PP
35 µV
RMS
100 dB
–110 dB
ADS8332EVMV2-PDK Evaluation Module
6-2.
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