AD6644PCB AD [Analog Devices], AD6644PCB Datasheet - Page 10

• Manufacturer Part Number: AD6644PCB
• Description: 14-Bit, 40 MSPS/65 MSPS A/D Converter
• Manufacturer: AD [Analog Devices]

AD6644
Figure 14. Harmonics vs. Analog Frequency (IF)
Figure 16. Two Tones at 19 MHz and 19.5 MHz
–100
–110
–120
–130
100
120
110
100
–10
–20
–30
–40
–50
–60
–70
–80
–90
95
90
85
80
75
70
65
60
55
90
80
70
60
50
40
30
20
10
0
0
–80
0
0
10
ENCODE = 65MSPS
AIN = 19MHz,
NO DITHER
ENCODE = 65MSPS
AIN = 15.5MHz
–70
Figure 15. Single Tone SFDR
WORST OTHER SPUR
5
ANALOG INPUT POWER LEVEL – dBFS
19.5MHz @ –7dBFS
20
HARMONICS (2
–60
ANALOG FREQUENCY – MHz
30
10
FREQUENCY – MHz
–50
40
15
nd
50
–40
, 3
rd
)
60
–30
20
ENCODE = 65MSPS
AIN = –1dBFS
dBc
SFDR = 90dB
REFERENCE LINE
70
dBFS
–20
25
80
–10
90
30
100
0
–10–
Figure 17. Two Tones at 15 MHz and 15.5 MHz
–100
–110
–120
–130
Figure 19. SNR, Worst Spurious vs. Encode
110
100
–10
–20
–30
–40
–50
–60
–70
–80
–90
100
90
80
70
60
50
40
30
20
10
95
90
85
80
75
70
65
60
0
0
–77
0
0
ENCODE = 65MSPS
F1 = 15MHz
F2 = 15.5MHz
10
–67
Figure 18. Two-Tone SFDR
5
INPUT POWER LEVEL – (F1 = F2) dBFS
20
–57
ENCODE FREQUENCY – MHz
10
30
FREQUENCY – MHz
WORST SPUR
–47
40
15
SNR
50
ENCODE = 65MSPS
AIN = 15MHz,
NO DITHER
–37
AIN = 2.2MHz @ –1dBFS
20
dBc
60
SFDR = 90dB
REFERENCE LINE
15.5MHz @ –7dBFS
–27
70
25
dBFS
–17
80
30
90
–7
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