AD7352YRUZ-RL datasheet(11/20 Pages) AD

Part #	AD7352YRUZ-RL

Description	Differential Input, Dual, Simultaneous Sampling, 3 MSPS, 12-Bit, SAR ADC

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Manufacturer	AD [Analog Devices]

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11 / 20 page

AD7352

Rev. 0 | Page 11 of 20

Intermodulation Distortion (IMD)

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 is equal to zero. For example,

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

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

(fa − 2fb).

The AD7352 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 and 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 as 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.

Thermal Hysteresis

Thermal hysteresis is defined as the absolute maximum change

of reference output voltage after the device is cycled through

temperature from either

T_HYS+ = +25°C to TMAX to +25°C

T_HYS− = +25°C to TMIN to +25°C

Thermal hysteresis is expressed in ppm using the following

equation:

6

10

)

25

(

)

_

(

)

25

(

)

ppm

(

×

°

−

°

=

C

V

HYS

T

V

C

V

REF

HYS

where:

VREF(25°C) is VREF at 25°C.

VREF(T_HYS) is the maximum change of VREF at T_HYS+

or T_HYS–.

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AD7352YRUZ-RL Datasheet(PDF) 11 Page - Analog Devices

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