EVAL-AD7323CB【PDF 15/36 页】500 kSPS, 4-Channel, Software-Selectable

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AD7323

Channel-to-Channel Isolation

Channel-to-channel isolation is a measure of the level of

crosstalk between any two channels. It is measured by applying a

full-scale, 100 kHz sine wave signal to all unselected input channels

and determining the degree to which the signal attenuates in the

selected channel with a 50 kHz signal. Figure 14 shows the worst-

case across all eight channels for the AD7323. The analog input

range is programmed to be the same on all channels.

Rev. 0 | Page 15 of 36

Intermodulation Distortion

With inputs consisting of sine waves at two frequencies, fa and

fb, any active device with nonlinearities creates distortion

products at sum and difference frequencies of mfa ± nfb, where

m, n = 0, 1, 2, 3, and so on. Intermodulation distortion terms

are those for which neither m nor n are equal to 0. For example,

the second-order terms include (fa + fb) and (fa fb), whereas

the third-order terms include (2fa + fb), (2fa fb), (fa + 2fb),

and (fa 2fb).

The AD7323 is tested using the CCIF standard where two input

frequencies near the top end of the input bandwidth are used.

In this case, the second-order terms are usually distanced in

frequency from the original sine waves, whereas the third-order

terms are usually at a frequency close to the input frequencies.

As a result, the second- and third-order terms are specified

separately. The calculation of the intermodulation distortion is

per the THD specification, where it is the ratio of the rms sum

of the individual distortion products to the rms amplitude of

the sum of the fundamentals expressed in decibels.

PSR (Power Supply Rejection)

Variations in power supply affect the full-scale transition but

not the linearity of the converter. Power supply rejection is the

maximum change in the full-scale transition point due to a

change in power supply voltage from the nominal value (see the

Typical Performance Characteristics section).

CMRR (Common-Mode Rejection Ratio)

CMRR is defined as the ratio of the power in the ADC output at

full-scale frequency, f, to the power of a 100 mV sine wave

applied to the common-mode voltage of the VIN+ and VIN

frequency, f

, as

CMRR

(dB) = 10 log (

)

where

is the power at frequency f in the ADC output, and

is the power at frequency f

in the ADC output (see Figure 17).

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