Datasheet

AD9748 Data Sheet
Rev. B | Page 10 of 24
FREQUENCY (MHz)
MAGNITUDE (dBm)
0
–30
–20
–10
–50
–40
–90
–80
–70
–60
–100
0 10 20 30 40 50 60
f
CLOCK
= 125MSPS
f
OUT
= 27MHz
SFDR = 56.2dBc
AMPLITUDE = 0dBFS
03211-010
Figure 11. Single-Tone Spectral Plot @ 125 MSPS (Single-Ended Output)
FREQUENCY (MHz)
MAGNITUDE (dBm)
0
–30
–20
–10
–50
–40
–90
–80
–70
–60
–100
0 10 20 30 40 706050 80
f
CLOCK
= 165MSPS
f
OUT
= 49MHz
SFDR = 50.1dBc
AMPLITUDE = 0dBFS
03211-011
Figure 12. Single-Tone Spectral Plot @ 165 MSPS (Single-Ended Output)
5ns/DIV
50mV/DIV
03211-012
Figure 13. Step Response (Single-Ended Output)
FREQUENCY (MHz)
MAGNITUDE (dBm)
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
0 10.5 105
03211-043
f
CLOCK
= 210MSPS
f
OUT
= 68MHz
SFDR = 50dBc
AMPLITUDE = 0dBFS
Figure 14. Single-Tone Spectral Plot @ 210 MSPS (Single-Ended Output)
1.2V REF
3.3V
R
SET
R
LOAD
50Ω
V
DIFF
= V
OUTA
= V
OUTB
R
LOAD
50Ω
0.1µF
CLK+
SLEEP
REFIO
FS ADJ
DVDD
DCOM
DIGITAL DATA INPUTS (DB7–DB0)
150pF
3.3V
AVDD ACOM
AD9748
CURRENT
SOURCE
ARRAY
IOUTA
IOUTB
MODE
LSB
SWITCHES
SEGMENTED
SWITCHES
3.3V
CLKVDD
CLKCOM
CLK–
CMODE
LATCHES
03211-013
Figure 15. Simplified Block Diagram