Datasheet

AD9277
Rev. 0 | Page 15 of 48
–8
–
1
0
–12 –6 –4
180,000
160,000
140,000
120,000
100,000
80,000
60,000
40,000
20,000
0
–2 0 2 4 6 8 10 12
NUMBER OF HITS
CODES
08181-011
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
0
–15 –10 –5 0 5 10 15 20 25 30 35
NUMBER OF HITS
CODES
08181-012
Figure 12. Output-Referred Noise Histogram, GAIN+ = 1.6 V
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
12345678910
INPUT-REFERRED NOISE (nV/ Hz)
FREQUENCY (MHz)
LNA GAIN = 21.3dB
LNA GAIN = 15.6dB
LNA GAIN = 17.9dB
08181-013
Figure 13. Short-Circuit, Input-Referred Noise vs. Frequency,
PGA Gain = 30 dB, GAIN+ = 1.6 V
–140
–142
–138
–136
–134
–132
–130
–128
–
126
0 0.2 0.4 0.6 0.8
GAIN+ (V)
1.0 1.2 1.4 1.6
OUTPUT-REFERRED NOISE (dBFS/Hz)
08181-014
LNA GAIN = 21.3dB
LNA GAIN = 17.9dB
LNA GAIN = 15.6dB
Figure 14. Short-Circuit, Output-Referred Noise vs. GAIN+
50
52
54
56
58
60
62
64
0.4 0.6 0.8 1.0 1.2 1.4 1.6
SNR/SIN
A
D(dBFS)
GAIN+ (V)
08181-015
SNR
SINAD
Figure 15. SNR/SINAD vs. GAIN+, AIN = −1.0 dBFS
–25
–20
–15
–10
–5
0
0 5 10 15 20 25 30 35 40
AMPLITUDE (dBFS)
FREQUENCY (MHz)
08181-016
40MSPS
50MSPS
Figure 16. Antialiasing Filter (AAF) Pass-Band Response,
LPF Cutoff = f
SAMPLE
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