AD768
REV. B
–9–
Typical Performance Curves––AD768
0.2
0.0
–0.2
–0.4
–0.6
–0.8
–1.0
VOLTS
TIME – 5ns/Div
RL = 50
VOUT = 0 TO –1V
Figure 14. Rise and Fall
Characteristics
10k
2.0M
1.0M
OUTPUT
–
dB
FREQUENCY – Hz
CLOCK = 10MHz
FOUT = 1.002MHz
AMPLITUDE = 0dBm
0
–20
–40
–60
–80
–100
Figure 17. Typical SFDR
(With a Window)
FREQUENCY – Hz
OUTPUT
–
dB
0
–100
150
350
190
230
270
310
–60
–80
–40
–20
CLOCK = 10 MHz
F
OUT1 = 240 kHz
F
OUT2 = 260 kHz
AMPLITUDE = –6.0 dB FS
PER TONE
OUTPUT IOUTB
R
L = 50
Figure 20. Intermodulation
Distortion
RL = 50
VOUT = 0 TO –1V
–0.470
–0.472
–0.474
–0.476
–0.478
–0.480
–0.482
OUTPUT
–
V
TIME – 2ns/Div
Figure 13. Glitch Impulse at Major
Carry
5
0.1
3
24
1
OUTPUT
–
dB
FREQUENCY – MHz
0
–20
–40
–60
–80
–100
CLOCK = 10MHz
FOUT = 1.002MHz
AMPLITUDE = 0dBm
OUTPUT IOUTB
RL = 50
Figure 16. Typical Spectral
Performance
FREQUENCY – MHz
THD
–
dB
–80
–75
–50
0.01
0.1
10
1
–65
–60
–55
–70
CLOCK = 1MHz
CLOCK = 10MHz
CLOCK = 20MHz
CLOCK = 30MHz
CLOCK = 40MHz
Figure 19. THD vs. FOUT
Figure 12. Settling Time
FREQUENCY – MHz
–80
–75
–50
420
40
THD
–
dB
–65
–60
–55
–70
56 7 8 9 10
30
RL = 50
VOUT = 0 TO –1V
Figure 15. THD vs. Clock Frequency
at FOUT = 1 MHz
1
10
FREQUENCY – MHz
CLOCK = 30MHz
CLOCK = 20MHz
–86
–82
–50
–78
–74
–70
–66
–62
–58
–54
SFDR
CLOCK = 10MHz
Figure 18. SFDR (Within a Window)
vs. FOUT
–0.9405
–0.9443
–0.9415
–0.9424
–0.9433
–0.9453
–0.9500
–0.9462
–0.9472
–0.9498
–0.9481
12
24
36
14 16 18 20 22
34
26 28 30 32
1.00
0.60
0.90
0.80
0.70
0.50
0.10
0.40
0.30
0.20
0.025
0.05
OUTPUT
–
dB
ERROR
BAND
–
%
TIME – ns
RL = 50
VOUT = 0 TO –1V