AD9200ARS datasheet(18/25 Pages) AD

18 / 25 page

AD9200

–17–

REV. E

Figures 35–38 combine the dual-tone SFDR as well as single

tone SFDR and SNR performance at IF frequencies of 45 MHz,

70 MHz, 85 MHz and 135 MHz. Note, the SFDR vs. ampli-

tude 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 AD9200 without the AD8009.

The AD9200 was operated in the differential mode (via trans-

former) with a 1 V span at 20 MSPS. The analog supply

(AVDD) and the digital supply (DRVDD) were set to +5 V and

3.3 V, respectively.

–60

–40

–20

INPUT POWER LEVEL – dBFS

–10

–50

–30

SINGLE TONE SFDR

DUAL TONE SFDR

SNR

CLK = 20MSPS

SINGLE TONE – 45.52MHz

DUAL TONE – F1 = 44.49MHz

– F2 = 45.52MHz

Figure 35. SNR/SFDR for IF @ 45 MHz

–60

–40

–20

INPUT POWER LEVEL – dBFS

–10

–50

–30

SINGLE TONE SFDR

DUAL TONE SFDR

SNR

CLK = 21.538MSPS

SINGLE TONE – 70.55MHz

DUAL TONE – F1 = 69.50MHz

– F2 = 70.55MHz

Figure 36. SNR/SFDR for IF @ 70 MHz

Although not presented, data was also taken with the insertion

of an AD8009 gain stage of 32 dB in the signal path. No

degradation in two-tone SFDR vs. amplitude was noted at an

IF of 45 MHz, 70 MHz and 85 MHz. However, at 135 MHz,

the AD8009 became the limiting factor in the distortion perfor-

mance until the two input tones were decreased to –15 dBFS

from their full-scale level of –6.5 dBFS. Note: the SNR perfor-

mance in each case degraded by approximately 0.5 dB due to

the AD8009’s in-band noise contribution.

–60

–40

–20

INPUT POWER LEVEL – dBFS

–10

–50

–30

SINGLE TONE SFDR

DUAL TONE SFDR

SNR

CLK = 20MSPS

SINGLE TONE – 85.52MHz

DUAL TONE – F1 = 84.49MHz

– F2 = 85.52MHz

Figure 37. SNR/SFDR for IF @ 85 MHz

–60

–40

–20

INPUT POWER LEVEL – dBFS

–10

–50

–30

SINGLE TONE SFDR

DUAL TONE SFDR

SNR

CLK = 20MSPS

SINGLE TONE – 135.52MHz

DUAL TONE – F1 = 134.44MHz

– F2 = 135.52MHz

Figure 38. SNR/SFDR for IF @ 135 MHz

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