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AD7266

Rev. B | Page 12 of 28

The AD7266 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, while the third-order

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

As a result, the second-order 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 dBs.

Common-Mode Rejection Ratio (CMRR)

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 p-p sine wave

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

frequency fS as

CMRR (dB) = 10 log(Pf/PfS)

where:

Pf is the power at frequency f in the ADC output.

PfS is the power at frequency fS in the ADC output.

Power Supply Rejection Ratio (PSRR)

Variations in power supply affect the full-scale transition but

not the converter’s linearity. PSRR is the maximum change in

the full-scale transition point due to a change in power supply

voltage from the nominal value (see Figure 4).

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

It is expressed in ppm by

)

(

)

(

)

(

)

(

−

REF

HYS

ppm

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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