AD9865
61.0
60.5
60.0
59.5
59.0
58.5
58.0
57.5
57.0
56.5
–52
–54
–56
–58
–60
–62
–64
–66
–68
–70
–72
60.0
59.5
59.0
58.5
58.0
57.5
57.0
56.5
56.0
55.5
55.0
–20
–30
–40
–50
–60
–70
SNR @ 3.13V
SNR @ 3.3V
SNR @ 3.47V
SNR @ 3.13V
SNR @ 3.3V
SNR @ 3.46V
THD @ 3.13V
THD @ 3.3V
THD @ 3.47V
THD @ 3.13V
THD @ 3.3V
THD @ 3.46V
56.0
–6
0
6
12
18
24
30
36
42
48
20
30
40
50
60
70
80
INPUT FREQUENCY (MHz)
INPUT FREQUENCY (MHz)
Figure 15. SNR and THD vs. Input Frequency and Supply
( LPF f−3 dB = 26 MHz; RxPGA = 0 dB)
Figure 18. SNR and THD vs. Sample Rate and Supply
(LPF Disabled; RxPGA = 0 dB; fIN = 8 MHz)
109.4
98.5
87.5
76.6
65.6
54.7
43.8
32.8
21.9
10.9
0
20
18
16
14
12
10
8
45
44
43
42
41
40
39
38
AD9865: +25°C
AD9865: +85°C
AD9865: –40°C
6
4
2
0
–6
0
6
12
18
24
30
36
42
48
0
10
20
30
40
50
60
70
80
RxPGA GAIN (dB)
CUTOFF FREQUENCY (MHz)
Figure 16. Input Referred Integrated Noise and Noise Spectral Density vs.
RxPGA Gain (LPF f−3 dB = 26 MHz)
Figure 19. SNR vs. Filter Cutoff Frequency
(50 MSPS; fIN = 5 MHz; AIN = −1 dB; RxPGA = 48 dB)
5
4
0.5
0.4
3
0.3
2
0.2
1
0.1
0
0
–1
–0.1
–0.2
–0.3
–0.4
–0.5
–2
DEVICE 1
DEVICE 2
DEVICE 3
DEVICE 4
–3
AD9865: GAIN STEP ERROR @ +25
AD9865: GAIN STEP ERROR @ +85
°
°
C
C
C
–4
AD9865: GAIN STEP ERROR @ –40
18 24 30 36 42
RxPGA GAIN (dB)
°
–5
–6
0
6
12
18
24
30
36
42
48
–6
0
6
12
48
GAIN (dB)
Figure 17. Rx DC Offset vs. RxPGA Gain
Figure 20. RxPGA Gain Step Error vs. Gain (fIN = 10 MHz)
Rev. A | Page 14 of 48
ADI [ ADI ]
