Datasheet

AD9272
Rev. C | Page 16 of 44
–7 –6 –5 –4
500k
450k
400k
350k
300k
250k
200k
150k
100k
50k
0
–3–2–101234567
NUMBER OF HITS
CODES
07029-115
Figure 11. Output-Referred Noise Histogram, GAIN+ = 0 V
–7 –6 –5 –4
180k
160k
140k
120k
100k
80k
60k
40k
20k
0
–3–2–101234567
NUMBER OF HITS
CODES
07029-116
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
1234567891
INPUT-REFERRED NOISE (nV/
0
√
Hz)
FREQUENCY (MHz)
LNA GAIN = 21.3dB
LNA GAIN = 15.6dB
LNA GAIN = 17.9dB
07029-187
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 0.2 0.4 0.6 0.8
GAIN+ (V)
1.0 1.2 1.4 1.6
OUTPUT-REFERRED NOISE (dBFS/Hz)
LNA GAIN = 8×
LNA GAIN = 12×
LNA GAIN = 6×
07029-117
Figure 14. Short-Circuit, Output-Referred Noise vs. GAIN+
50
52
54
56
58
60
62
64
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
SNR/SIN
A
D(dBFS)
GAIN+ (V)
SINAD
SNR
07029-118
Figure 15. SNR/SINAD vs. GAIN+, AIN = −1 dBFS
–25
–20
–15
–10
–5
0
0 5 10 15 20 25 30 35 40
AMPLITUDE (dBFS)
FREQUENCY (MHz)
07029-120
AD9272-40
AD9272-65
AD9272-80
Figure 16. Antialiasing Filter (AAF) Pass-Band Response,
LPF Cutoff = 1 × (1/4.5) × f
SAMPLE