AD6620SSLASHPCB datasheet(14/43 Pages) AD

14 / 43 page

AD6620

–14–

REV. 0

CIC2 DECIMATION

LOG2 – M

225

234

250

275

300

325

350

375

400

CIC5 DECIMATION

RCF DECIMATION

Figure 21. Typical Power vs. Decimation Rates

–132

–120

–108

–96

–84

–72

–60

–48

–36

–24

–12

fSAMP

SPUR = –104dB

PHASE DITHER OFF

Figure 22. Typical NCO Spur Without Dither

–132

–120

–108

–96

–84

–72

–60

–48

–36

–24

–12

fSAMP

SPUR = –118dB

PHASE DITHER ON

Figure 23. Worst Case NCO Spur with Dither

–140

–120

–100

–80

–60

–40

–20

COMPOSITE FREQUENCY RESPONSE – MHz

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.

–140

–120

–100

–80

–60

–40

–20

COMPOSITE FREQUENCY RESPONSE – MHz

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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