AD9833 datasheet(10/24 Pages) AD

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AD9833

Data Sheet

Rev. E | Page 10 of 24

TERMINOLOGY

Integral Nonlinearity (INL)

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

passing through the endpoints of the transfer function. The end-

points of the transfer function are zero scale, a point 0.5 LSB

below the first code transition (000 … 00 to 000 … 01), and full

scale, a point 0.5 LSB above the last code transition (111 … 10

to 111 … 11). The error is expressed in LSBs.

Differential Nonlinearity (DNL)

DNL is the difference between the measured and ideal 1 LSB

change between two adjacent codes in the DAC. A specified

DNL of ±1 LSB maximum ensures monotonicity.

Output Compliance

Output compliance refers to the maximum voltage that can be

generated at the output of the DAC to meet the specifications.

When voltages greater than that specified for the output compli-

ance are generated, the AD9833 may not meet the specifications

listed in the data sheet.

Spurious-Free Dynamic Range (SFDR)

Along with the frequency of interest, harmonics of the funda-

mental frequency and images of these frequencies are present at

the output of a DDS device. SFDR refers to the largest spur or

harmonic present in the band of interest. The wideband SFDR

gives the magnitude of the largest spur or harmonic relative to

the magnitude of the fundamental frequency in the zero 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.

Total Harmonic Distortion (THD)

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

of the fundamental. For the AD9833, THD is defined as

log

THD

where:

V1 is the rms amplitude of the fundamental.

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

through sixth harmonics.

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

output spectrum of the AD9833.

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