ADC083000 datasheet(14/33 Pages) NSC

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Specification Definitions (Continued)

OVER-RANGE RECOVERY TIME is the time required after

the differential input voltages goes from ±1.2V to 0V for the

converter to recover and make a conversion with its rated

accuracy.

PIPELINE DELAY (LATENCY) is the number of input clock

cycles between initiation of conversion and when that data is

presented to the output driver stage. New data is available at

every clock cycle, but the data lags the conversion by the

Pipeline Delay plus the t

OD.

POSITIVE FULL-SCALE ERROR (PFSE) is a measure of

how far the last code transition is from the ideal 1-1/2 LSB

below a differential +435 mV with the FSR pin high, or 1-1/2

LSB below a differential +325 mV with the FSR pin low. For

the ADC083000 the reference voltage is assumed to be

ideal, so this error is a combination of full-scale error and

reference voltage error.

POWER SUPPLY REJECTION RATIO (PSRR) can be one

of two specifications. PSRR1 (DC PSRR) is the ratio of the

change in full-scale error that results from a power supply

voltage change from 1.8V to 2.0V. PSRR2 (AC PSRR) is a

measure of how well an a.c. signal riding upon the power

supply is rejected from the output and is measured with a

248 MHz, 50 mV

P-P signal riding upon the power supply. It is

the ratio of the output amplitude of that signal at the output to

its amplitude on the power supply pin. PSRR is expressed in

dB.

SIGNAL TO NOISE RATIO (SNR) is the ratio, expressed in

dB, of the rms value of the input signal at the output to the

rms value of the sum of all other spectral components below

one-half the sampling frequency, not including harmonics or

d.c.

SIGNAL TO NOISE PLUS DISTORTION (S/(N+D) or SI-

NAD) is the ratio, expressed in dB, of the rms value of the

input signal at the output to the rms value of all of the other

spectral components below half the input clock frequency,

including harmonics but excluding d.c.

SPURIOUS-FREE DYNAMIC RANGE (SFDR) is the differ-

ence, expressed in dB, between the rms values of the input

signal at the output and the peak spurious signal, where a

spurious signal is any signal present in the output spectrum

that is not present at the input, excluding d.c.

TOTAL HARMONIC DISTORTION (THD) is the ratio ex-

pressed in dB, of the rms total of the first nine harmonic

levels at the output to the level of the fundamental at the

output. THD is calculated as

where A

f1 is the RMS power of the fundamental (output)

frequency and A

f2 through Af10 are the RMS power of the

first 9 harmonic frequencies in the output spectrum.

– Second Harmonic Distortion (2nd Harm) is the differ-

ence, expressed in dB, between the RMS power in the input

frequency seen 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 fre-

quency seen at the output and the power in its 3rd harmonic

level at the output.

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