AD9834 datasheet(14/32 Pages) AD

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AD9834

Data Sheet

Rev. D | Page 14 of 32

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

endpoints 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

The 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 com-

pliance are generated, the AD9834 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 present in the band of interest. The

wideband 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.

Total Harmonic Distortion (THD)

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

of the fundamental. For the AD9834, THD is defined as

THD

log





where V1 is the rms amplitude of the fundamental and V2, V3,

, V5, and V6 are the rms amplitudes of the second harmonic

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

output spectrum of the AD9834.

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