Analog Devices AD9865 Manual page 14

AD9865
61.0
60.5
60.0
59.5
THD @ 3.13V
THD @ 3.3V
59.0
THD @ 3.47V
58.5
58.0
57.5
57.0
56.5
56.0
–6 0 6 12 18
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
65.6
54.7
43.8
32.8
21.9
10.9
0
–6 0 6 12 18
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 18
GAIN (dB)
Figure 17. Rx DC Offset vs. RxPGA Gain
–52
SNR @ 3.13V
SNR @ 3.3V
–54
SNR @ 3.47V
–56
–58
–60
–62
–64
–66
–68
–70
–72
24 30 36 42 48
20
18
16
14
AD9865: +25°C
AD9865: +85°C 12
AD9865: –40°C
10
8
6
4
2
0
24 30 36 42 48
= 26 MHz)
−3 dB
DEVICE 1
DEVICE 2
DEVICE 3
DEVICE 4
24 30 36 42 48
Rev. A | Page 14 of 48
60.0
59.5
59.0
SNR @ 3.13V
SNR @ 3.3V
58.5
SNR @ 3.46V
58.0
57.5
57.0
56.5
56.0
55.5
55.0
20 30 40 50
INPUT FREQUENCY (MHz)
Figure 18. SNR and THD vs. Sample Rate and Supply
(LPF Disabled; RxPGA = 0 dB; f
45
44
43
42
41
40
39
38
0 10 20 30 40
CUTOFF FREQUENCY (MHz)
Figure 19. SNR vs. Filter Cutoff Frequency
= 5 MHz; AIN = −1 dB; RxPGA = 48 dB)
(50 MSPS; f
IN
0.5
0.4
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
AD9865: GAIN STEP ERROR @ +25 ° C
AD9865: GAIN STEP ERROR @ +85 ° C
–0.4
AD9865: GAIN STEP ERROR @ –40 ° C
–0.5
–6 0 6 12 18
RxPGA GAIN (dB)
Figure 20. RxPGA Gain Step Error vs. Gain (f
–20
–30
–40
THD @ 3.13V
THD @ 3.3V –50
THD @ 3.46V
–60
–70
60 70 80
= 8 MHz)
IN
50 60 70 80
24 30 36 42 48
= 10 MHz)
IN