Datasheet

AD9740
Rev. B | Page 12 of 32
TEMPERATURE (°C)
SFDR (dBc)
90
80
85
50
55
60
70
65
75
–40 0 20–20 40 60 80
4MHz
19MHz
34MHz
49MHz
02911-017
Figure 18. SFDR vs. Temperature @ 165 MSPS, 0 dBFS
FREQUENCY (MHz)
MAGNITUDE (dBm)
0
–40
–30
–20
–10
–100
–90
–80
–60
–70
–50
111166213126 36
f
CLOCK
= 78MSPS
f
OUT
= 15.0MHz
SFDR = 77dBc
AMPLITUDE = 0dBFS
02911-018
Figure 19. Single-Tone SFDR
FREQUENCY (MHz)
MAGNITUDE (dBm)
0
–40
–30
–20
–10
–100
–90
–80
–60
–70
–50
111166213126 36
f
CLOCK
= 78MSPS
f
OUT1
= 15.0MHz
f
OUT2
= 15.4MHz
SFDR = 77dBc
AMPLITUDE = 0dBFS
02911-019
Figure 20. Dual-Tone SFDR
FREQUENCY (MHz)
MAGNITUDE (dBm)
0
–40
–30
–20
–10
–100
–90
–80
–60
–70
–50
111166213126 36
f
CLOCK
= 78MSPS
f
OUT1
= 15.0MHz
f
OUT2
= 15.4MHz
f
OUT3
= 15.8MHz
f
OUT4
= 16.2MHz
SFDR = 72dBc
AMPLITUDE = 0dBFS
02911-020
Figure 21. Four-Tone SFDR
DIGITAL DATA INPUTS (DB9–DB0)
150pF
1.2V REF
AVDD
ACOM
REFLO
PMOS
CURRENT SOURCE
ARRAY
3.3V
SEGMENTED SWITCHES
FOR DB9–DB1
LSB
SWITCHES
REFIO
FS ADJ
DVDD
DCOM
CLOCK
3.3V
R
SET
2kΩ
0.1μF
IOUTA
IOUTB
AD9740
SLEEP
LATCHES
I
REF
V
REFIO
CLOCK
IOUTB
IOUTA
R
LOAD
50Ω
V
OUTB
V
OUTA
R
LOAD
50Ω
V
DIFF
= V
OUTA
– V
OUTB
MODE
02911-021
Figure 22. Simplified Block Diagram (SOIC/TSSOP Packages)