Analog Devices AD9776 Instruction Manual page 17

REF 0dBm *ATTEN 20dB
*PEAK
Log
10dB/
LGAV
51
S2
W1
FC
S3
AA
£(f):
FTUN
SWP
START 1.0MHz
*RES BW 20kHz VBW 20kHz
Figure 23. AD9779 Single Tone, 4× Interpolation, f
f
OUT
REF 0dBm *ATTEN 20dB
*PEAK
Log
10dB/
LGAV
51
W1 S2
FC
S3
AA
£(f):
FTUN
SWP
START 1.0MHz
*RES BW 20kHz VBW 20kHz
Figure 24. AD9779 Two-Tone Spectrum, 4× Interpolation, f
f
OUT
–142
–146
–150
–154
–158
–162
–166
–170
0 20
Figure 25. AD9779 Noise Spectral Density vs. Digital Full-Scale of Single-Tone
Input, f = 200 MSPS, 2× Interpolation
DATA
EXT REF
DC COUPLED
STOP 400.0MHz
SWEEP 1.203s (601 pts)
= 100 MSPS,
DATA
= 30 MHz
EXT REF
DC COUPLED
STOP 400.0MHz
SWEEP 1.203s (601 pts)
= 100 MSPS,
DATA
= 30,35 MHz
–3dBFS
0dBFS
–6dBFS
40 60 80
f
(MHz)
OUT
–150
–154
–158
–162
–166
–170
0
Figure 26. AD9779 Noise Spectral Density vs. f
–150
–154
–158
–162
–166
–170
0
Figure 27. AD9779 Noise Spectral Density vs. f
–55
–60
–65
–70
0dBFS
–75
–80
–85
–90
0 20
Figure 28. AD9779 ACLR for First Adjacent Band WCDMA, 4× Interpolation,
f = 122.88 MSPS, On-Chip Modulation Translates Baseband Signal to IF
DATA
Rev. 0 | Page 17 of 56
AD9776/AD9778/AD9779
f
DAC
f
= 200MSPS
DAC
f
= 800MSPS
DAC
20 40 60
f
(MHz)
OUT
DAC
with 500 kHz Spacing, f = 200 MSPS
DATA
f
= 200MSPS
DAC
f
= 400MSPS
DAC
f
= 800MSPS
DAC
20 40 60
f
(MHz)
OUT
Single-Tone Input at –6 dBFS
0dBFS – PLL ON
–3dBFS
–6dBFS
40 60 80 100 120 140 160 180 200 220 240
f
(MHz)
OUT
= 400MSPS
80 100
, Eight-Tone Input
80 100
,
DAC
260