AD6644PCB AD [Analog Devices], AD6644PCB Datasheet - Page 11

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

REV. 0
Figure 22. SNR, Worst Spurious vs. Clamped Encode
Power (See Figure 25)
–100
–110
–120
–130
100
–10
–20
–30
–40
–50
–60
–70
–80
–90
90
80
70
60
50
40
30
20
10
95
90
85
80
75
70
65
–15.0
0
0
–90
0
Figure 20. 1M FFT Without Dither
WORST SPUR
ENCODE = 65MSPS
AIN = 15.5MHz
NO DITHER
Figure 21. SFDR Without Dither
ENCODE = 65MSPS
AIN = 15.5MHz @ –29.5dBFS
NO DITHER
–80
–10.0
5
30.5MHz
ANALOG INPUT POWER LEVEL – dBFS
–70
ENCODE INPUT POWER – dBm
2.2MHz
10
–5.0
–60
FREQUENCY – MHz
–50
30.5MHz
15
2.2MHz
0
–40
20
SFDR = 90dB
REFERENCE LINE
SNR
ENCODE = 65MSPS
–30
5.0
–20
25
10.0
–10
30
15.0
0
–11–
–100
–110
–120
–130
–10
–20
–30
–40
–50
–60
–70
–80
–90
0
100
90
80
70
60
50
40
30
20
10
0
0
–90
ENCODE = 65MSPS
AIN = 15.5MHz @ –29.5dBFS
DITHER @ –19dBm
ENCODE = 65MSPS
AIN = 15.5MHz
DITHER = –19dBm
–80
Figure 23. 1M FFT with Dither
5
Figure 24. SFDR with Dither
ANALOG INPUT POWER LEVEL – dBFS
–70
10
FREQUENCY – MHz
–60
SFDR = 90dB
REFERENCE LINE
15
–50
–40
20
SFDR = 100dB
REFERENCE LINE
–30
25
–20
AD6644
–10
30
0