AD775
54
48
42
36
–36
–30
S/(N + D) – dB
30
24
18
12
6
0
0.1
THD – dB
–42
–48
1
f
IN
– MHz
10
–54
0.1
1
f
IN
– MHz
10
Figure 2. S/(N + D) vs. Input Frequency at 20 MSPS Clock
Rate (V
IN
= –0.3 dB)
Figure 5. THD vs. Input Frequency at 20 MSPS Clock Rate
(V
IN
= –0.3 dB)
0
–10
–20
–30
–40
dB
0
–10
–20
–30
–40
dB
0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
–50
–60
–70
–80
–90
–100
FREQUENCY – MHz
–50
–60
–70
–80
–90
–100
0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
FREQUENCY – MHz
Figure 3. Typical FFT at 1 MHz Input, 20 MSPS Clock Rate
(V
IN
= –0.5 dB)
Figure 6. Typical FFT at 5 MHz Input, 20 MSPS Clock Rate
(V
IN
= –0.5 dB)
+0.4
+0.3
+0.2
+0.1
0
–0.1
–0.2
–0.3
–0.4
–FULLSCALE
INL – LSB
+1
DNL – LSB
0
+FULLSCALE
–1
–FULLSCALE
+FULLSCALE
Figure 4. Typical Differential Nonlinearity (DNL)
Figure 7. Typical Integral Nonlinearity (INL)
REV. 0
–5–
AD [ ANALOG DEVICES ]
