Datasheet

AD9244
Rev. C | Page 16 of 36
02404-034
FREQUENCY (MHz)
32.505 25201510 30.0
AMPLITUDE (dBFS)
0
–20
–40
–60
–80
–100
–120
SNR = 62.6dBc
SFDR = 60.7dBc
Figure 34. Dual-Tone with f
IN−1
= 239.1 MHz and
f
IN−2
= 240.7 MHz (A
IN−1
= A
IN−2
= –6.5 dBFS)
02404-035
FREQUENCY (MHz)
0 5 10 15 20 25 30
AMPLITUDE (dBFS)
0
–20
–10
–40
–30
–60
–50
–100
–110
–90
–80
–70
–120
SNR = 71.3dBc
THD = –90.8dBc
NOTE: SPUR FLOOR
BELOW 90dBFS @ 240MHz
Figure 35. Driving ADC Inputs with Transformer and Balun,
f
IN
= 240 MHz, A
IN
= –8.5 dBFS
02404-036
INPUT FREQUENCY (MHz)
2500 50 100 150 200
AMPLITUDE (dBFS)
105
100
95
90
85
80
75
70
65
Figure 36. CMRR vs. Input Frequency (A
IN
= 0 dBFS and CML = 2.5 V)
02404-037
A
IN
(dBFS)
–5–30 –25 –20 –15 –10
dBFS AND dBc
100
90
80
70
60
50
40
SFDR = 90dBc
REFERENCE LINE
SNR (dBc)
SFDR (dBFS)
SNR (dBFS)
SFDR (dBc)
Figure 37. Dual-Tone SNR/SFDR vs. A
IN
with
f
IN−1
= 239.1 MHz and f
IN−2
= 240.7 MHz
02404-038
A
IN
(dBFS)
0–21 –18 –15 –12 –9 –6 –3
dBFS AND dBc
100
85
90
95
80
75
70
65
60
55
50
SNR (dBc)
SNR (dBFS)
SFDR (dBc)
SFDR (dBFS)
SFDR = 90dBc
REFERENCE LINE
Figure 38. Driving ADC Inputs with Transformer and
Balun SNR/SFDR vs. A
IN
, f
IN
= 240 MHz
02404-039
A
IN
(dBFS)
0–21 –18 –15 –12 –9 –6 –3
dBFS AND dBc
95
90
85
80
75
70
65
60
55
SNR (dBc)
SNR (dBFS)
SFDR (dBc)
SFDR (dBFS)
SFDR = 90dBc
REFERENCE LINE
Figure 39. Driving ADC Inputs with Transformer and
Balun SNR/SFDR vs. A
IN
, f
IN
= 190 MHz