AD9272 datasheet(17/45 Pages) AD

17 / 45 page

AD9272

Rev. C | Page 16 of 44

–7 –6 –5 –4

500k

450k

400k

350k

300k

250k

200k

150k

100k

50k

–3 –2 –1

234

CODES

Figure 11. Output-Referred Noise Histogram, GAIN+ = 0 V

–7 –6 –5 –4

180k

160k

140k

120k

100k

80k

60k

40k

20k

–3 –2 –1

234

CODES

Figure 12. Output-Referred Noise Histogram, GAIN+ = 1.6 V

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

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FREQUENCY (MHz)

LNA GAIN = 21.3dB

LNA GAIN = 15.6dB

LNA GAIN = 17.9dB

Figure 13. Short-Circuit, Input-Referred Noise vs. Frequency,

PGA Gain = 30 dB, GAIN+ = 1.6 V

–140

–138

–136

–134

–132

–130

–128

–126

0.2

0.4

0.6

0.8

GAIN+ (V)

1.0

1.2

1.4

1.6

LNA GAIN = 8×

LNA GAIN = 12×

LNA GAIN = 6×

Figure 14. Short-Circuit, Output-Referred Noise vs. GAIN+

0.4

0.5 0.6

0.7 0.8

0.9 1.0 1.1

1.2 1.3 1.4

1.5 1.6

GAIN+ (V)

SINAD

SNR

Figure 15. SNR/SINAD vs. GAIN+, AIN = −1 dBFS

–25

–20

–15

–10

–5

FREQUENCY (MHz)

AD9272-40

AD9272-65

AD9272-80

Figure 16. Antialiasing Filter (AAF) Pass-Band Response,

LPF Cutoff = 1 × (1/4.5) × fSAMPLE

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