AD9224ARSZ datasheet(20/24 Pages) AD

20 / 24 page

AD9224

–20–

REV. A

The distortion and noise performance of an ADC at the given

IF frequency is of particular concern when evaluating an ADC

for a narrowband IF sampling application. Both single tone and

dual tone SFDR vs. amplitude are very useful in assessing an

ADC’s dynamic and static nonlinearities. SNR vs. amplitude

performance at the given IF is useful in assessing the ADC’s

noise performance and noise contribution due to aperture jitter.

In any application, one is advised to test several units of the

same device under the same conditions to evaluate the given

applications sensitivity to that particular device.

Figures 36–39 combine the dual tone SFDR as well as single

tone SFDR and SNR performances at IF frequencies of 35 MHz,

45 MHz, 71 MHz, and 85 MHz. Note, the SFDR vs. amplitude

data is referenced to dBFS while the single tone SNR data is

referenced to dBc. The performance characteristics in these

figures are representative of the AD9224 without any preceding

gain stage. The AD9224 was operated in the differential mode

(via transformer) with a 2 V span and a sample rate between

28 MSPS and 36 MSPS. The analog supply (AVDD) and the

digital supply (DRVDD) were set to +5 V and +3.3 V respectively.

AIN – dBFS

100

–0.5

–30

–5

–10

–15

–20

–25

SFDR-SINGLE

TONE (dBFS)

SFDR-DUAL

TONE (dBFS)

SNR-SINGLE

TONE (dBc)

Figure 36. IF Undersampling at 35 MHz (F1 = 34.64 MHz,

F2 = 35.43 MHz, fCLOCK = 28 MSPS)

AIN – dBFS

100

–0.5

–30

–5

–10

–15

–20

–25

SFDR-SINGLE

TONE (dBFS)

SFDR-DUAL

TONE (dBFS)

SNR-SINGLE

TONE (dBc)

Figure 37. IF Undersampling at 45 MHz (F1 = 44.53 MHz,

F2 = 45.55 MHz, fCLOCK = 36 MSPS)

AIN – dBFS

100

–0.5

–30

–5

–10

–15

–20

–25

SFDR-SINGLE

TONE (dBFS)

SFDR-DUAL

TONE (dBFS)

SNR-SINGLE

TONE (dBc)

Figure 38. IF Undersampling at 70 MHz (F1 = 70.46 MHz,

F2 = 71.36 MHz, fCLOCK = 31.5 MSPS)

AIN – dBFS

100

–0.5

–5

–10

–15

–20

–25

SFDR-SINGLE

TONE (dBFS)

SFDR-DUAL

TONE (dBFS)

SNR-SINGLE

TONE (dBc)

Figure 39. IF Undersampling at 85 MHz (F1 = 84.46 MHz,

F2 = 85.36 MHz, fCLOCK = 31 MSPS)

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