AD5934_15 datasheet(11/32 Pages) AD

Part #	AD5934

Description	250 kSPS, 12-Bit Impedance Converter, Network Analyzer

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Manufacturer	AD [Analog Devices]

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Data Sheet

AD5934

Rev. C | Page 11 of 32

TERMINOLOGY

Total System Accuracy

The AD5934 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 fundamental

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 fundamental,

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. THD is defined as

V1

V6

V5

V4

V3

V2

THD

2

log

20

)

dB

(

+

=

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