HI5766KCB【PDF 7/16 页】CONV A/D 10BIT 60MSPS 28-SOIC

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where:

VCORR = 0.5 dB.

VCORR adjusts the SINAD, and hence the ENOB, for the

amount the analog input signal is below full scale.

Signal To Noise and Distortion Ratio (SINAD)

SINAD is the ratio of the measured RMS signal to RMS sum

of all the other spectral components below the Nyquist

frequency, fS/2, excluding DC.

Signal To Noise Ratio (SNR)

SNR is the ratio of the measured RMS signal to RMS noise at

a specified input and sampling frequency. The noise is the

RMS sum of all of the spectral components below fS/2

excluding the fundamental, the first five harmonics and DC.

Total Harmonic Distortion (THD)

THD is the ratio of the RMS sum of the first 5 harmonic

components to the RMS value of the fundamental input signal.

2nd and 3rd Harmonic Distortion

This is the ratio of the RMS value of the applicable harmonic

component to the RMS value of the fundamental input signal.

Spurious Free Dynamic Range (SFDR)

SFDR is the ratio of the fundamental RMS amplitude to the

RMS amplitude of the next largest spectral component in the

spectrum below fS/2.

Intermodulation Distortion (IMD)

Nonlinearities in the signal path will tend to generate

intermodulation products when two tones, f1 and f2, are

present at the inputs. The ratio of the measured signal to the

distortion terms is calculated. The terms included in the

calculation are (f1+f2), (f1-f2), (2f1), (2f2), (2f1+f2), (2f1-f2),

(f1+2f2), (f1-2f2). The ADC is tested with each tone 6dB

below full scale.

Transient Response

Transient response is measured by providing a full scale

transition to the analog input of the ADC and measuring the

number of cycles it takes for the output code to settle within

10-bit accuracy.

Over-Voltage Recovery

Over-Voltage Recovery is measured by providing a full scale

transition to the analog input of the ADC which overdrives

the input by 200mV, and measuring the number of cycles it

takes for the output code to settle within 10-bit accuracy.

Full Power Input Bandwidth (FPBW)

Full power input bandwidth is the analog input frequency at

which the amplitude of the digitally reconstructed output has

decreased 3dB below the amplitude of the input sine wave.

The input sine wave has an amplitude which swings from

-FS to +FS. The bandwidth given is measured at the

specified sampling frequency.

Video Definitions

Differential Gain and Differential Phase are two commonly

found video specifications for characterizing the distortion of

a chrominance signal as it is offset through the input voltage

range of an ADC.

Differential Gain (DG)

Differential Gain is the peak difference in chrominance

amplitude (in percent) relative to the reference burst.

Differential Phase (DP)

Differential Phase is the peak difference in chrominance

phase (in degrees) relative to the reference burst.

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