AD5933 datasheet(12/40 Pages) AD

12 / 40 page

AD5933

Data Sheet

Rev. E | Page 12 of 40

TERMINOLOGY

Total System Accuracy

The AD5933 can accurately measure a range of impedance

values to less than 0.5% of the correct impedance value for

supply voltages between 2.7 V to 5.5 V.

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. The spurious-free dynamic range

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 Hz 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.

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.

Total Harmonic Distortion (THD)

THD is the ratio of the rms sum of harmonics to the funda-

mental, where V1 is the rms amplitude of the fundamental

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

second through the sixth harmonics. For the AD5933, THD

is defined as

THD

log

(dB)

AD5933 Datasheet(PDF) 12 Page - Analog Devices