AD9277 datasheet(16/49 Pages) AD

16 / 49 page

AD9277

Rev. 0 | Page 15 of 48

–8

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–4

180,000

160,000

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120,000

100,000

80,000

60,000

40,000

20,000

–2

CODES

Figure 11. Output-Referred Noise Histogram, GAIN+ = 0.0 V

–35 –30 –25 –20

70,000

60,000

50,000

40,000

30,000

20,000

10,000

–15 –10 –5

10 15 20 25 30 35

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

2.0

12345

6789

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

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0.2

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GAIN+ (V)

1.0

1.2

1.4

1.6

LNA GAIN = 21.3dB

LNA GAIN = 17.9dB

LNA GAIN = 15.6dB

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

0.4

0.6

0.8

1.0

1.2

1.4

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GAIN+ (V)

SNR

SINAD

Figure 15. SNR/SINAD vs. GAIN+, AIN = −1.0 dBFS

–25

–20

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–5

FREQUENCY (MHz)

40MSPS

50MSPS

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

LPF Cutoff = fSAMPLE/4.5

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