THS10064_09 Datasheet, PDF (36/42 Pages) Texas Instruments – 10-BIT, 4 ANALOG INPUT, 6 MSPS, SIMULTANEOUS SAMPLING ANALOG-TO-DIGITAL CONVERTER

THS10064
SLAS255B – DECEMBER 1999 – REVISED DECEMBER 2002
www.ti.com
DEFINITIONS OF SPECIFICATIONS AND TERMINOLOGY
Integral Nonlinearity
Integral nonlinearity refers to the deviation of each individual code from a line drawn from zero through full scale. The
point used as zero occurs 1/2 LSB before the first code transition. The full-scale point is defined as a level 1/2 LSB
beyond the last code transition. The deviation is measured from the center of each particular code to the true straight
line between these two points.
Differential Nonlinearity
An ideal ADC exhibits code transitions that are exactly 1 LSB apart. DNL is the deviation from this ideal value. A
differential nonlinearity error of less than ±1 LSB ensures no missing codes.
Zero Offset
The major carry transition should occur when the analog input is at zero volts. Zero error is defined as the deviation
of the actual transition from that point.
Gain Error
The first code transition should occur at an analog value 1/2 LSB above negative full scale. The last transition should
occur at an analog value 1 1/2 LSB below the nominal full scale. Gain error is the deviation of the actual difference
between first and last code transitions and the ideal difference between first and last code transitions.
Signal-to-Noise Ratio + Distortion (SINAD)
SINAD is the ratio of the rms value of the measured input signal to the rms sum of all other spectral components below
the Nyquist frequency, including harmonics but excluding dc. The value for SINAD is expressed in decibels.
Effective Number of Bits (ENOB)
For a sine wave, SINAD can be expressed in terms of the number of bits. Using the following formula,
+ ^* N
(SINAD 1.76)
6.02
it is possible to get a measure of performance expressed as N, the effective number of bits. Thus, the effective number
of bits for a device for sine wave inputs at a given input frequency can be calculated directly from its measured SINAD.
Total Harmonic Distortion (THD)
THD is the ratio of the rms sum of the first six harmonic components to the rms value of the measured input signal
and is expressed as a percentage or in decibels.
Spurious Free Dynamic Range (SFDR)
SFDR is the difference in dB between the rms amplitude of the input signal and the peak spurious signal.
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