AD6645 Analog Devices, AD6645 Datasheet - Page 12

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AD6645

Manufacturer Part Number
AD6645
Description
14-Bit, 80 MSPS/105 MSPS A/D Converter
Manufacturer
Analog Devices
Datasheet

Specifications of AD6645

Resolution (bits)
14bit
# Chan
1
Sample Rate
105MSPS
Interface
Par
Analog Input Type
Diff-Uni
Ain Range
2.2 V p-p
Adc Architecture
Pipelined
Pkg Type
QFP

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AD6645
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0
0
0
90
0
Figure 24. Single Tone @ 69.1 MHz, Encode = 76.8 MSPS
0
ENCODE = 80.0MSPS
AIN = 30.5MHz @ –29.5dBFS
NO DITHER
ENCODE = 80.0MSPS
AIN = 30.5MHz
NO DITHER
80
Figure 22. 1 M Sample FFT Without Dither
5
5
5
Figure 23. SFDR Without Dither
70
10
10
ANALOG INPUT LEVEL (dBFS)
3
60
FREQUENCY (MHz)
FREQUENCY (MHz)
15
15
2
50
2
20
20
6
SFDR = 90dB
REFERENCE LINE
40
ENCODE = 76.8MSPS
AIN = 69.1MHz @ –1dBFS
SNR = 73.5dB
SFDR = 89.0dBc
3
25
25
30
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20
6
4
35
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Rev. D | Page 12 of 24
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Figure 27. W-CDMA Tone @ 69.1 MHz, Encode = 76.8 MSPS
0
0
0
–90
0
0
ENCODE = 80.0MSPS
AIN = 30.5MHz @ –29.5dBFS
WITH DITHER @ –19.2 dBm
ENCODE = 80.0MSPS
AIN = 30.5MHz
WITH DITHER @ –19.2dBm
SFDR = 100dB
REFERENCE LINE
–80
5
5
Figure 25. 1 M Sample FFT with Dither
5
–70
10
10
Figure 26. SFDR with Dither
ANALOG INPUT LEVEL (dBFS)
3
–60
FREQUENCY (MHz)
FREQUENCY (MHz)
15
15
2
–50
2
20
20
–40
SFDR = 90dB
REFERENCE LINE
ENCODE = 76.8MSPS
AIN = W-CDMA @ 69.1MHz
6
3
25
25
–30
30
30
–20
6
4
35
35
–10
4
5
40
40
0

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