OUTCLK

Valid Data

tSUO

Valid Data

tHO

Valid Data

tDP

tDP

SData

ADC14DS080

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SNAS428B – SEPTEMBER 2007 – REVISED APRIL 2013

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

from code 8191 to 8192.

OUTPUT DELAY is the time delay after the falling edge of the clock before the data update is presented at the

output pins.

PIPELINE DELAY (LATENCY) See CONVERSION LATENCY.

POSITIVE FULL SCALE ERROR is the difference between the actual last code transition and its ideal value of

1½ LSB below positive full scale.

POWER SUPPLY REJECTION RATIO (PSRR) is a measure of how well the ADC rejects a change in the power

supply voltage. PSRR is the ratio of the Full-Scale output of the ADC with the supply at the minimum DC supply

limit to the Full-Scale output of the ADC with the supply at the maximum DC supply limit, expressed in dB.

SIGNAL TO NOISE RATIO (SNR) is the ratio, expressed in dB, of the rms value of the input signal to the rms

value of the sum of all other spectral components below one-half the sampling frequency, not including

harmonics or DC.

SIGNAL TO NOISE PLUS DISTORTION (S/N+D or SINAD) Is the ratio, expressed in dB, of the rms value of the

input signal to the rms value of all of the other spectral components below half the clock frequency, including

harmonics but excluding d.c.

SPURIOUS FREE DYNAMIC RANGE (SFDR) is the difference, expressed in dB, between the rms values of the

input signal and the peak spurious signal, where a spurious signal is any signal present in the output spectrum

that is not present at the input.

TOTAL HARMONIC DISTORTION (THD) is the ratio, expressed in dB, of the rms total of the first six harmonic

levels at the output to the level of the fundamental at the output. THD is calculated as

(4)

where f1 is the RMS power of the fundamental (output) frequency and f2 through f7 are the RMS power of the first

six harmonic frequencies in the output spectrum.

SECOND HARMONIC DISTORTION (2ND HARM) is the difference expressed in dB, between the RMS power in

the input frequency at the output and the power in its 2nd harmonic level at the output.

THIRD HARMONIC DISTORTION (3RD HARM) is the difference, expressed in dB, between the RMS power in

the input frequency at the output and the power in its 3rd harmonic level at the output.

Timing Diagrams

Figure 1. Serial Output Data Timing

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