AD9244_15 Datasheet, PDF (16/36 Pages) Analog Devices – 14-Bit, 40 MSPS/65 MSPS A/D Converter

AD9244
0
SNR = 62.6dBc
SFDR = 60.7dBc
–20
–40
–60
–80
–100
–120
0
5
10
15
20
25
30.0 32.5
FREQUENCY (MHz)
Figure 34. Dual-Tone with fIN−1 = 239.1 MHz and
fIN−2 = 240.7 MHz (AIN−1 = AIN−2 = –6.5 dBFS)
0
–10
–20
–30
–40
–50
–60
–70 ^{NOTE: SPUR FLOOR}
BELOW 90dBFS @ 240MHz
–80
–90
–100
–110
–120
0
5
10
15
20
FREQUENCY (MHz)
SNR = 71.3dBc
THD = –90.8dBc
25
30
Figure 35. Driving ADC Inputs with Transformer and Balun,
fIN = 240 MHz, AIN = –8.5 dBFS
105
100
95
90
85
80
75
70
65
0
50
100
150
200
250
INPUT FREQUENCY (MHz)
Figure 36. CMRR vs. Input Frequency (AIN = 0 dBFS and CML = 2.5 V)
100
90
SFDR (dBFS)
80
SNR (dBFS)
70
SFDR (dBc)
60 SFDR = 90dBc
REFERENCE LINE
50
SNR (dBc)
40
–30
–25
–20
–15
–10
–5
A_IN (dBFS)
Figure 37. Dual-Tone SNR/SFDR vs. AIN with
fIN−1 = 239.1 MHz and fIN−2 = 240.7 MHz
100
95
SFDR (dBFS)
90
SFDR = 90dBc
REFERENCE LINE
85
80
SNR (dBFS)
75
SFDR (dBc)
70
65
60
SNR (dBc)
55
50
–21
–18
–15
–12
–9
–6
–3
0
A_IN (dBFS)
Figure 38. Driving ADC Inputs with Transformer and
Balun SNR/SFDR vs. AIN, fIN = 240 MHz
95
90
SFDR (dBFS)
85
SFDR (dBc)
80
SFDR = 90dBc
REFERENCE LINE
75
SNR (dBFS)
70
65
SNR (dBc)
60
55
–21
–18
–15
–12
–9
–6
–3
0
A_IN (dBFS)
Figure 39. Driving ADC Inputs with Transformer and
Balun SNR/SFDR vs. AIN, fIN = 190 MHz
Rev. C | Page 16 of 36