Datasheet

AD9776/AD9778/AD9779
Rev. A | Page 18 of 56
100
50
55
60
65
70
75
80
85
90
95
0
400
f
OUT
(MHz)
IMD (dBc)
80 160 240 36032040 120 200 280
05361-117
0dBFS
–3dBFS
–6dBFS
Figure 24. IMD Performance vs. Digital Full-Scale Input, 4× Interpolation,
f
DATA
= 200 MSPS
100
50
55
60
65
70
75
80
85
90
95
0
400
f
OUT
(MHz)
IMD (dBc)
80 160 240 36032040 120 200 280
05361-118
20mA
10mA
30mA
Figure 25. IMD Performance vs. Full-Scale Output Current, 4× Interpolation,
f
DATA
= 200 MSPS
STOP 400.0MHz
SWEEP 1.203s (601 pts)VBW 20kHz
START 1.0MHz
*RES BW 20kHz
REF 0dBm
*PEAK
Log
10dB/
LGAV
51
W1
S3
£(f):
FTUN
SWP
S2
FC
AA
*ATTEN 20dB
EXT REF
DC COUPLED
05361-023
Figure 26. AD9779 Single Tone, 4× Interpolation, f
DATA
= 100 MSPS,
f
OUT
= 30 MHz
STOP 400.0MHz
SWEEP 1.203s (601 pts)VBW 20kHz
START 1.0MHz
*RES BW 20kHz
REF 0dBm
*PEAK
Log
10dB/
LGAV
51
W1
S3
£(f):
FTUN
SWP
S2
FC
AA
*ATTEN 20dB
EXT REF
DC COUPLED
05361-024
Figure 27. AD9779 Two-Tone Spectrum, 4× Interpolation,
f
DATA
= 100 MSPS, f
OUT
= 30 MHz, 35 MHz
–142
–146
–150
–154
–158
–162
–166
–170
0
f
OUT
(MHz)
NSD (dBm/Hz)
20 40 60 80
0dBFS
–3dBFS
–6dBFS
05361-025
Figure 28. AD9779 Noise Spectral Density vs. Digital Full-Scale of Single-Tone
Input, f
DATA
= 200 MSPS, 2× Interpolation
–150
–170
0 100
f
OUT
(MHz)
NSD (dBm/Hz)
–154
–158
–162
–166
20 40 60 80
f
DAC
= 800MSPS
f
DAC
= 400MSPS
f
DAC
= 200MSPS
05361-026
Figure 29. AD9779 Noise Spectral Density vs. f
DAC
, Eight-Tone Input
with 500 kHz Spacing, f
DATA
= 200 MSPS