ADC07D1520 Datasheet, PDF (17/53 Pages) Texas Instruments – Low Power, 7-Bit, Dual 1.5 GSPS or Single 3.0 GSPS A/D Converter

ADC07D1520
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 +V_IN/2. For the ADC07D1520 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 (D.C. 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 (A.C. 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 SINAD) 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 difference, 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 expressed 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 A_f10 are the RMS power of the first 9 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
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 frequency seen
at the output and the power in its 3rd harmonic level at the output.
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