Analog Devices AD9273 Manual page 17

AD9273
500k
450k
400k
350k
300k
250k
200k
150k
100k
50k
0
–7 –6 –5 –4 –3 –2
Figure 12. Output-Referred Noise Histogram, GAIN+ = 0.0 V
200k
180k
160k
140k
120k
100k
80k
60k
40k
20k
0
–7 –6 –5 –4 –3 –2 –1
Figure 13. Output-Referred Noise Histogram, GAIN+ = 1.6 V
3.0
2.5
2.0
LNA GAIN = 15.6dB
1.5
LNA GAIN = 21.3dB
1.0
0.5
0
1 2 3 4
FREQUENCY (MHz)
Figure 14. Short-Circuit, Input-Referred Noise vs. Frequency,
PGA Gain = 30 dB, GAIN+ = 1.6 V
–1 0 1 2 3 4 5 6
CODES
0 1 2 3 4 5 6
CODES
LNA GAIN = 17.9dB
5 6 7 8 9 10
–128
–129
–130
–131
–132
–133
–134
–135
–136
–137
–138
–139
0
7
Figure 15. Short-Circuit, Output-Referred Noise vs. GAIN+
65
60
55
50
45
40
7 0.5
Figure 16. SNR/SINAD vs. GAIN+, AIN = −1.0 dBFS
0
–2
–4
–6
–8
–10
–12
–14
–16
–18
–20
0
Figure 17. Antialiasing Filter (AAF) Pass-Band Response,
Rev. B | Page 16 of 48
LNA GAIN = 8×
0.2 0.4 0.6 0.8 1.0
GAIN+ (V)
SNR
SINAD
0.6 0.7 0.8 0.9 1.0 1.1 1.2
GAIN+ (V)
40MSPS
25MSPS
5 10 15
FREQUENCY (MHz)
LPF Cutoff = 1 × (1/3) × f
SAMPLE
LNA GAIN = 12×
LNA GAIN = 6×
1.2 1.4 1.6
1.3 1.4 1.5 1.6
50MSPS
20 25