Datasheet

AD6620
–14–
REV. A
CIC2 DECIMATION
LOG
2
(M)
225
51
POWER – mW
234
250
275
300
325
350
375
400
CIC5 DECIMATION
RCF DECIMATION
TPC 1. Typical Power vs. Decimation Rates
0
–132
–120
–108
–96
–84
–72
–60
–48
–36
–24
–12
0
f
SAMP
SPUR = –104dB
PHASE DITHER OFF
TPC 2. Typical NCO Spur Without Dither
0
–132
–120
–108
–96
–84
–72
–60
–48
–36
–24
–12
0
f
SAMP
SPUR = –118dB
PHASE DITHER ON
TPC 3. Typical NCO Spur with Dither
–Typical Performance Characteristics
0
1
–140
–120
–100
–80
–60
–40
–20
0
REJECTION – dB
COMPOSITE FREQUENCY RESPONSE – MHz
23
TPC 4. 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
REJECTION – dB
COMPOSITE FREQUENCY RESPONSE – MHz
486
TPC 5. High Decimation AMPS Filter
Input sample rate 58.32 MSPS, decimation is 300, FIR taps is
128. Unshown spectrum is below that shown. Decimation distri-
bution among CIC2, CIC5, and RCF is 10, 30 and 1, respectively.