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AD6620S/PCB Datasheet(PDF) 14 Page - Analog Devices

No. de pieza AD6620S/PCB
Descripción Electrónicos  65 MSPS Digital Receive Signal Processor
PDF  43 Pages
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Fabricante Electrónico  AD [Analog Devices]
Página de inicio  http://www.analog.com
Logo AD - Analog Devices

AD6620S/PCB Datasheet(HTML) 14 Page - Analog Devices

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AD6620
–14–
REV. 0
CIC2 DECIMATION
LOG2 – M
225
5
1
234
250
275
300
325
350
375
400
CIC5 DECIMATION
RCF DECIMATION
Figure 21. Typical Power vs. Decimation Rates
0
–132
–120
–108
–96
–84
–72
–60
–48
–36
–24
–12
0
fSAMP
SPUR = –104dB
PHASE DITHER OFF
Figure 22. Typical NCO Spur Without Dither
0
–132
–120
–108
–96
–84
–72
–60
–48
–36
–24
–12
0
fSAMP
SPUR = –118dB
PHASE DITHER ON
Figure 23. Worst Case NCO Spur with Dither
0
1
–140
–120
–100
–80
–60
–40
–20
0
COMPOSITE FREQUENCY RESPONSE – MHz
23
Figure 24. High Decimation GSM Filter
Input sample rate 65 MSPS, decimation is 240, FIR taps is 240.
Unshown spectrum is below that shown. Decimation distribu-
tion is 3, 10, 8, respectively.
0
2
–140
–120
–100
–80
–60
–40
–20
0
COMPOSITE FREQUENCY RESPONSE – MHz
48
6
Figure 25. High Decimation AMPS Filter
Input sample rate 58.32 MSPS, decimation is 300, FIR taps is
128. Unshown spectrum is below that shown. Decimation
distribution among CIC2, CIC5 and RCF is 10, 30 and 1,
respectively.



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