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By ALL ABOUT ELECTRONICS
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Get instant insights and key takeaways from this YouTube video by ALL ABOUT ELECTRONICS.
ADC Performance Parameters: Beyond Basics
📌 Basic ADC parameters like resolution, reference voltage, and sampling rate are insufficient for optimal application selection.
🧐 A 12-bit ADC with an Integral Non-Linearity (INL) error of 4 Least Significant Bits (LSB) effectively yields only 10 bits of accuracy.
⚙️ For accurate ADC selection, parameters related to DC errors, specifically gain error and offset error, must be analyzed.
Understanding Offset Error
↔️ Offset error occurs when the ADC's transfer function shifts horizontally (left or right) relative to the ideal transfer function.
🛑 Applying 0 Volts input and observing an output code other than all zeros indicates the presence of an offset error.
📈 Positive offset error occurs when the actual transfer curve lies above the ideal curve; negative offset error occurs when it lies below.
📊 Offset error can be quantified in LSB, volts, or as a percentage of the full-scale voltage. For an N-bit ADC with reference voltage , the voltage error is .
Understanding Gain Error
📉 Gain error represents the difference in the slope between the ideal and actual transfer functions, measured after calibrating for offset error.
➕ A positive gain error means the actual slope lies above the ideal slope; a negative gain error means the actual slope lies below the ideal slope.
⚠️ Both offset and gain errors reduce the ADC's overall conversion range.
Key Points & Insights
➡️ Even if required accuracy is met by resolution (e.g., needing 10 bits, using 12 bits), non-linearity errors like INL can degrade effective accuracy.
➡️ Offset error calibration using software can reduce conversion range; for a 12-bit ADC, an offset of translates to approximately error relative to .
➡️ Gain error is quantified by comparing the actual voltage producing the full-scale output code against the ideal voltage, reflecting the difference in slope.
📸 Video summarized with SummaryTube.com on Dec 02, 2025, 03:32 UTC
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Full video URL: youtube.com/watch?v=G7jkCyGipc8
Duration: 9:24
Get instant insights and key takeaways from this YouTube video by ALL ABOUT ELECTRONICS.
ADC Performance Parameters: Beyond Basics
📌 Basic ADC parameters like resolution, reference voltage, and sampling rate are insufficient for optimal application selection.
🧐 A 12-bit ADC with an Integral Non-Linearity (INL) error of 4 Least Significant Bits (LSB) effectively yields only 10 bits of accuracy.
⚙️ For accurate ADC selection, parameters related to DC errors, specifically gain error and offset error, must be analyzed.
Understanding Offset Error
↔️ Offset error occurs when the ADC's transfer function shifts horizontally (left or right) relative to the ideal transfer function.
🛑 Applying 0 Volts input and observing an output code other than all zeros indicates the presence of an offset error.
📈 Positive offset error occurs when the actual transfer curve lies above the ideal curve; negative offset error occurs when it lies below.
📊 Offset error can be quantified in LSB, volts, or as a percentage of the full-scale voltage. For an N-bit ADC with reference voltage , the voltage error is .
Understanding Gain Error
📉 Gain error represents the difference in the slope between the ideal and actual transfer functions, measured after calibrating for offset error.
➕ A positive gain error means the actual slope lies above the ideal slope; a negative gain error means the actual slope lies below the ideal slope.
⚠️ Both offset and gain errors reduce the ADC's overall conversion range.
Key Points & Insights
➡️ Even if required accuracy is met by resolution (e.g., needing 10 bits, using 12 bits), non-linearity errors like INL can degrade effective accuracy.
➡️ Offset error calibration using software can reduce conversion range; for a 12-bit ADC, an offset of translates to approximately error relative to .
➡️ Gain error is quantified by comparing the actual voltage producing the full-scale output code against the ideal voltage, reflecting the difference in slope.
📸 Video summarized with SummaryTube.com on Dec 02, 2025, 03:32 UTC
Find relevant products on Amazon related to this video
As an Amazon Associate, we earn from qualifying purchases

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