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AD9866
65.0
64.5
64.0
63.5
63.0
62.5
62.0
61.5
61.0
60.5
60.0
0
5
10
INPUT FREQUENCY (MHz)
Figure 15. SNR and THD vs. Input Frequency and Supply
( LPF f
= 26 MHz; RxPGA = 0 dB)
−3 dB
109.4
98.5
87.5
76.6
56.6
54.7
43.8
32.8
21.9
+25°C
10.9
0
18
24
30
RxPGA GAIN (dB)
Figure 16. Input Referred Integrated Noise and Noise Spectral Density
vs. RxPGA Gain (LPF f
5
4
3
2
1
0
–1
–2
–3
–4
–5
–6
0
6
12
Figure 17. Rx DC Offset vs. RxPGA Gain
–52
SNR @ 3.14V
SNR @ 3.3V
–54
SNR @ 3.47V
–56
–58
–60
THD @ 3.14V
–62
THD @ 3.3V
THD @ 3.47V
–64
–66
–68
–70
–72
15
20
35
30
20
18
16
14
12
10
8
–40°C
6
+85°C
4
2
0
36
42
48
= 26 MHz)
−3 dB
DEVICE 1
DEVICE 2
DEVICE 3
DEVICE 4
18
24
30
36
42
48
GAIN (dB)
63
62
61
60
59
58
57
56
55
54
53
20
Figure 18. SNR and THD vs. Sample Rate and Supply
45
44
43
42
41
40
39
38
0
(50 MSPS; f
0.5
0.4
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
–6
Figure 20. RxPGA Gain Step Error vs. Gain (f
Rev. A | Page 14 of 48
SNR vs. MSPS @ 3.0V
SUP
SNR vs. MSPS @ 346V
SUP
SNR @ 3.13V
30
40
50
60
INPUT FREQUENCY (MHz)
(LPF Disabled; RxPGA = 0 dB; f
= 8 MHz)
IN
10
20
30
40
50
CUTOFF FREQUENCY (MHz)
Figure 19. SNR vs. Filter Cutoff Frequency
= 5 MHz; AIN = −1 dB; RxPGA = 48 dB)
IN
AD9866: GAIN STEP ERROR @ +25°C
AD9866: GAIN STEP ERROR @ +85°C
AD9866: GAIN STEP ERROR @ –40°C
0
6
12
18
24
30
RxPGA GAIN (dB)
–20
–25
–30
–35
–40
–45
THD @ 3.13V
THD @ 3.46V
–50
THD @ 3.3V
–55
–60
–65
–70
70
80
60
70
80
36
42
48
= 10 MHz)
IN
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