Datasheet
AD9776A/AD9778A/AD9779A
Rev. B | Page 20 of 56
–
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
06452-027
Figure 30. AD9779A Noise Spectral Density vs. f
OUT
,
f
DAC
Over Output Frequency with a Single-Tone Input at −6 dBFS
–
55
–90
–85
–80
–75
–70
–65
–60
0
26024022020018016014012010080604020
f
OUT
(MHz)
ACLR (dBc)
06452-300
0dBFS, PLL DISABLED
–3dBFS, PLL DISABLED
–6dBFS, PLL DISABLED
0dBFS, PLL ENABLED
Figure 31. AD9779A ACLR for First Adjacent Band W-CDMA,
4× Interpolation, f
DATA
= 122.88 MSPS,
On-Chip Modulation Translates Baseband Signal to IF
SPAN 50MHz
SWEEP 162.2ms (601 pts)
VBW 300kHz
CENTER 143.88MHz
*RES BW 30kHz
RMS RESULTS
CARRIER POWER
–12.49dBm/
3.84000MHz
FREQ OFFSET
5.000MHz
10.00MHz
15.00MHz
REF BW
3.840MHz
3.840MHz
3.840MHz
dBc
–76.75
–80.94
–79.95
dBm
–89.23
–93.43
–92.44
LOWER
dBc
–77.42
–80.47
–78.96
dBm
–89.91
–92.96
–91.45
UPPER
REF –25.28dBm
*AVG
log
10dB
PAVG
10
W1 S2
*ATTEN 4dB
EXT REF
0
6452-031
Figure 32. AD9779A W-CDMA Signal,
4× Interpolation, f
DATA
= 122.88 MSPS, f
DAC
/4 Modulation
–
55
–90
–85
–80
–75
–70
–65
–60
0
26024022020018016014012010080604020
f
OUT
(MHz)
ACLR (dBc)
06452-301
–3dBFS, PLL DISABLED
–6dBFS, PLL DISABLED
0dBFS, PLL ENABLED
0dBFS, PLL DISABLED
Figure 33. AD9779A ACLR for Second Adjacent Band W-CDMA,
4× Interpolation, f
DATA
= 122.88 MSPS,
On-Chip Modulation Translates Baseband Signal to IF
–
55
–90
–85
–80
–75
–70
–65
–60
0
26024022020018016014012010080604020
f
OUT
(MHz)
ACLR (dBc)
06452-302
–3dBFS, PLL DISABLED
–6dBFS, PLL DISABLED
0dBFS, PLL ENABLED
0dBFS, PLL DISABLED
Figure 34. AD9779A ACLR for Third Adjacent Band W-CDMA,
4× Interpolation, f
DATA
= 122.88 MSPS,
On-Chip Modulation Translates Baseband Signal to IF
SPAN 50MHz
SWEEP 162.2ms (601 pts)
VBW 300kHz
CENTER 151.38MHz
*RES BW 30kHz
1 –17.87dBm
2 –20.65dBm
3 –18.26dBm
4 –18.23dBm
TOTAL CARRIER POWER –12.61dBm/15.3600MHz
REF CARRIER POWER –17.87dBm/3.84000MHz
FREQ OFFSET
5.000MHz
10.00MHz
15.00MHz
INTEG BW
3.840MHz
3.840MHz
3.840MHz
dBc
–67.70
–70.00
–71.65
dBm
–85.57
–97.87
–99.52
LOWER
dBc
–67.70
–69.32
–71.00
dBm
–85.57
–87.19
–88.88
UPPER
REF –30.28dBm
*AVG
log
10dB
PAVG
10
W1 S2
*ATTEN 4dB
EXT REF
06452-032
Figure 35. AD9779A Multicarrier W-CDMA Signal,
4× Interpolation, f
DAC
= 122.88 MSPS, f
DAC
/4 Modulation