AD6644 Analog Devices, AD6644 Datasheet - Page 11

• Manufacturer Part Number: AD6644
• Description: 14-Bit, 40 MSPS/65 MSPS Analog-to-Digital Converter
• Manufacturer: Analog Devices

Specifications of AD6644

• Resolution (bits): 14bit
• # Chan: 1
• Sample Rate: 65MSPS
• Interface: Par
• Analog Input Type: Diff-Uni
• Ain Range: 2.2 V p-p
• Adc Architecture: Pipelined
• Pkg Type: QFP

–100
–110
–120
–130
100
90
80
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40
30
20
10
–10
–20
–30
–40
–50
–60
–70
–80
–90
0
–90
0
0
ENCODE = 65MSPS
AIN = 15.5MHz
NO DITHER
–80
ENCODE = 65MSPS
AIN = 15.5MHz @ –29.5dBFS
NO DITHER
5
Figure 16. 1M FFT Without Dither
ANALOG INPUT POWER LEVEL (dBFS)
–70
Figure 17. SFDR Without Dither
–60
10
FREQUENCY (MHz)
–50
15
–40
SFDR = 90dB
REFERENCE LINE
20
–30
–20
25
–10
30
0
Rev. D | Page 11 of 24
Figure 18. SNR, Worst Spurious vs. Clamped Encode Power (See Figure 27)
100
–100
–110
–120
–130
95
90
85
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75
70
65
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–20
–30
–40
–50
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–70
–80
–90
90
80
70
60
50
40
30
20
10
–15
0
–90
0
0
ENCODE = 65MSPS
AIN = 15.5MHz
DITHER = –19dBm
WORST SPUR
ENCODE = 65MSPS
AIN = 15.5MHz @ –29.5dBFS
DITHER @ –19dBm
–80
–10
30.5MHz
5
ANALOG INPUT POWER LEVEL (dBFS)
–70
Figure 19. 1M FFT with Dither
Figure 20. SFDR with Dither
ENCODE INPUT POWER (dBm)
2.2MHz
–60
–5
10
SFDR = 90dB
REFERENCE LINE
FREQUENCY (MHz)
–50
30.5MHz
2.2MHz
15
0
–40
20
SNR
SFDR = 100dB
REFERENCE LINE
ENCODE = 65MSPS
–30
5
–20
25
10
–10
AD6644
30
15
0