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ADUCM330WFS Datasheet(Fiches technique) 15 Page - Analog Devices
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ADUCM330WFS Datasheet(HTML) 15 Page - Analog Devices
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Rev. A | Page 15 of 17
The conversion rate specifies the rate at which an output result
is available from the ADC after the ADC has settled.
The Σ-Δ conversion techniques used on this device mean that,
although the ADC front-end signal is oversampled at a
relatively high sample rate, a subsequent digital filter is used to
decimate the output. Use of a digital filter provides a valid
20-bit data conversion result at output rates from 4 Hz to 8 kHz.
When software switches from one input to another on the same
ADC, the digital filter must first be cleared and then allowed to
average a new result. Depending on the configuration of the
ADC and the type of filter, this averaging can require multiple
Integral Nonlinearity (INL)
INL is the maximum deviation of any code from a straight line
passing through the endpoints of the transfer function. The
endpoints of the transfer function are zero scale, which is a
point ½ LSB below the first code transition, and full scale,
which is a point ½ LSB above the last code transition (111…110
to 111…111). The error is expressed as a percentage of full scale.
Positive INL is the deviation from a straight line through ½ LSB
above midscale code transition to ½ LSB above the last code
Negative INL is the deviation from a straight line from a point
½ LSB below the first code transition to a point ½ LSB above
the midscale code transition.
No Missing Codes
No missing codes is a measure of the differential nonlinearity of
the ADC. The error is expressed in bits and specifies the number
of codes (ADC results) as 2
bits, where N equals no missing
codes, guaranteed to occur through the full ADC input range.
Offset error is the deviation of the first code transition ADC
input voltage from the ideal first code transition.
Offset Error Drift
Offset error drift is the variation in absolute offset error with
respect to temperature. This error is expressed as LSB/°C or
Gain error is a measure of the span error of the ADC. It is a
measure of the difference between the measured and the ideal
span between any two points in the transfer function.
The output noise is specified as the standard deviation (or 1 × Σ)
of ADC output code distribution collected when the ADC input
voltage is at a dc voltage. It is expressed as µV rms or nV rms.
The output, or rms noise, is used to calculate the effective
resolution of the ADC as defined by the following equation,
measured in bits:
Effective Resolution = log
(Full-Scale Range/rms Noise)
The peak-to-peak noise is defined as the deviation of codes that
fall within 6.6 × Σ of the distribution of ADC output codes
collected when the ADC input voltage is at dc. The peak-to-
peak noise is therefore calculated as 6.6 × the rms noise.
The peak-to-peak noise can be used to calculate the ADC noise
free code resolution for which there is no code flicker within a
6.6 × Σ limit as defined by the following equation, measured in bits:
Noise Free Code Resolution = log
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