ADF4350
0
–20
–40
–60
–80
–100
–120
–140
–160
1k
10k
100k
1M
10M
FREQUENCY (Hz)
Figure 10. Integer-N Phase Noise and Spur Performance. GSM900 Band,
RFOUT = 904 MHz, REFIN = 100 MHz, PFD = 800 kHz, Output Divide-by-4
Selected; Loop-Filter Bandwidth = 16 kHz, Channel Spacing = 200 kHz.
0
–20
–40
–60
–80
–100
–120
–140
–160
1k
10k
100k
1M
10M
FREQUENCY (Hz)
Figure 11. Fractional-N Spur Performance; Low Noise Mode. W-CDMA Band,
RFOUT = 2113.5 MHz, REFIN = 100 MHz, PFD = 25 MHz, Output Divide-by-2
Selected; Loop Filter Bandwidth = 40 kHz, Channel Spacing = 200 kHz.
0
–20
–40
–60
–80
–100
–120
–140
–160
1k
10k
100k
1M
10M
FREQUENCY (Hz)
Figure 12. Fractional-N Spur Performance. Low Spur Mode, W-CDMA Band
RFOUT = 2113.5 MHz, REFIN = 100 MHz, PFD = 25 MHz, Output Divide-by-2
Selected; Loop Filter Bandwidth = 40 kHz, Channel Spacing = 200 kHz
0
–20
–40
–60
–80
–100
–120
–140
–160
1k
10k
100k
1M
10M
FREQUENCY (Hz)
Figure 13. Fractional-N Spur Performance. Low Noise Mode, RFOUT =
2.591 GHz, REFIN = 105 MHz, PFD = 17.5 MHz, Output Divide-by-1 Selected;
Loop Filter Bandwidth = 20 kHz, Channel Spacing = 100 kHz.
0
–20
–40
–60
–80
–100
–120
–140
–160
1k
10k
100k
1M
10M
FREQUENCY (Hz)
Figure 14. Fractional-N Spur Performance. Low Spur Mode RFOUT =
2.591 GHz, REFIN = 105 MHz, PFD = 17.5 MHz, Output Divide-by-1 Selected.
Loop Filter Bandwidth = 20 kHz, Channel Spacing = 100 kHz (Note That
Fractional Spurs Are Removed and Only the Integer Boundary Spur Remains
in Low Spur Mode).
3.02
CSR OFF
3.01
CSR ON
3.00
2.99
2.98
2.97
2.96
2.95
0
100
200
300
400
500
600
TIME (µs)
Figure 15. Lock Time for 100 MHz Jump from 3070 MHz to 2970 MHz with
CSR On and Of f, PFD = 25 MHz, ICP = 313 μA, Loop Filter Bandwidth = 20 kHz
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