ADC14X250 datasheet(62/69 Pages) TI1

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ADC14X250

SLASE49 – DECEMBER 2015

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12 Device and Documentation Support

12.1 Device Support

12.1.1 Related Documentation

See the Isolation Glossary (SLLA353)

12.1.1.1 Specification Definitions

3-dB BANDWIDTH is a measure of the frequency at which the reconstructed output fundamental deviates 3 dB

from its low frequency value relative to the differential voltage signal applied at the device input

pins.

APERTURE DELAY is the time delay between the rising edge of the clock until the input signal is acquired or

held for conversion.

APERTURE JITTER (APERTURE UNCERTAINTY) is the variation in aperture delay from sample to sample.

CLOCK DUTY CYCLE is the ratio of the time during one cycle that a repetitive digital waveform is high to the

total time of one period. The specification here refers to the ADC clock input signal.

COMMON MODE VOLTAGE (VCM) is the common DC voltage applied to both terminals of the ADC differential

input.

COMMON MODE REJECTION RATIO (CMRR) is the ratio of the magnitude of the single-tone spur in the

sampled spectrum (referred to the ADC analog input as a peak voltage quantity) to the peak

voltage swing of a sinusoid simultaneously incident on the positive and negative terminals of a

differential analog input as a common-mode signal from which the spur generated. CMRR is

typically expressed in decibels [dB].

DIFFERENTIAL NON-LINEARITY (DNL) is the measure of the maximum deviation from the ideal step size of 1

least significant bit (LSB)

GAIN VARIATION is the expected standard deviation in the gain of the converter from an applied voltage to

output codes between parts or between channels.

INTEGRAL NON-LINEARITY (INL) is a measure of the deviation of each individual code from a best-fit straight

line. The deviation of any given code from this straight line is measured from the center of that code

value.

INTERMODULATION DISTORTION (IMD) is the creation of additional spectral components as a result of two

sinusoidal frequencies being applied to the ADC input at the same time. It quantifies the power of

the largest intermodulation product adjacent to the input tones, expressed in dBFS.

LEAST SIGNIFICANT BIT (LSB) is the bit that has the smallest value or weight of all bits. This value is VFS / 2

where VFSis the full scale input voltage and n is the ADC resolution in bits.

MISSING CODES are those output codes that do not appear at the ADC outputs. The ADC14X250 device is

specified not to have missing codes.

MOST SIGNIFICANT BIT (MSB) is the bit that has the largest value or weight. Its value is one half of full scale.

OFFSET ERROR is the difference between the two input voltages (VIN+ – VIN–) required to cause a transition

from code 8191LSB and 8192LSB with offset binary data format.

POWER SUPPLY SENSITIVITY is a measure of the sensitivity of the power supplies to noise. In this

specification, a supply is modulated with a 100-mV, 500-kHz sinusoid and the resulting spurs in the

spectrum are measured. The sensitivity is expressed relative to the power of a possible full-scale

sinusoid [dBFS].

SAMPLE-TO-SERIAL OUT (S2SO) LATENCY is the number of frame clock cycles between initiation of

conversion and the time when the first bit of serial data for that sample is present at the output

driver. This latency is not specified to be deterministic.

SAMPLE-TO-PARALLEL OUT (S2PO) LATENCY is the number of frame clock cycles between initiation of

conversion and the time when the parallel sample data is available at the output of the receiver’s

ADC14X250 Datasheet(PDF) 62 Page - Texas Instruments

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