EVAL-AD5930EB(Rev0) Просмотр технического описания (PDF) - Analog Devices

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производитель

EVAL-AD5930EB
(Rev.:Rev0)

Programmable Frequency Sweep and Output Burst Waveform Generator

Analog Devices 

TERMINOLOGY

Integral Nonlinearity (INL)

This is the maximum deviation of any code from a straight line

passing through the endpoints of the transfer function. The

endpoints of the transfer function are zero scale and full scale.

The error is expressed in LSBs.

Differential Nonlinearity (DNL)

This is the difference between the measured and ideal 1 LSB

change between two adjacent codes in the DAC. A specified

differential nonlinearity of ±1 LSB maximum ensures

monotonicity.

Output Compliance

The output compliance refers to the maximum voltage that can

be generated at the output of the DAC to meet the specifica-

tions. When voltages greater than that specified for the output

compliance are generated, the AD5930 may not meet the

specifications listed in the data sheet.

Spurious-Free Dynamic Range (SFDR)

Along with the frequency of interest, harmonics of the

fundamental frequency and images of these frequencies are

present at the output of a DDS device. The SFDR refers to the

largest spur or harmonic that is present in the band of interest.

The wide band SFDR gives the magnitude of the largest

harmonic or spur relative to the magnitude of the fundamental

frequency in the 0 to Nyquist bandwidth. The narrow band

SFDR gives the attenuation of the largest spur or harmonic in a

bandwidth of ±200 kHz about the fundamental frequency.

AD5930

Total Harmonic Distortion (THD)

THD is the ratio of the rms sum of harmonics to the rms value

of the fundamental. For the AD5930, THD is defined as

THD(dB) = 20 log V2 2 + V3 2 + V4 2 + V5 2 + V6 2

V1

where:

V1 is the rms amplitude of the fundamental.

V2, V3, V4, V5, and V6 are the rms amplitudes of the second

through the sixth harmonic.

Signal-to-Noise Ratio (SNR)

SNR is the ratio of the rms value of the measured output signal

to the rms sum of all other spectral components below the

Nyquist frequency. The value for SNR is expressed in decibels.

Clock Feedthrough

There is feedthrough from the MCLK input to the analog

output. Clock feedthrough refers to the magnitude of the

MCLK signal relative to the fundamental frequency in the

AD5930’s output spectrum.

Rev. 0 | Page 15 of 28

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