Analog Devices AD9854 User Manual page 21

Cmos 300 msps quadrature complete dds
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F2
F1
0
000 (DEFAULT)
MODE
TW1
0
TW2
0
I/O UD CLK
FSK DATA (PIN 29)
F2
F1
0
MODE
000 (DEFAULT)
TW1
0
TW2
0
DFW
I/O UD CLK
FSK DATA (PIN 29)
F2
F1
0
MODE
000 (DEFAULT)
TW1
0
TW2
0
I/O UD CLK
FSK DATA
001 (FSK NO RAMP)
Figure 36. Unramped (Traditional) FSK Mode
010 (RAMPED FSK)
F1
F2
REQUIRES A POSITIVE TWOS COMPLEMENT VALUE
RAMP RATE
Figure 37. Ramped FSK Mode (Start at F1)
010 (RAMPED FSK)
F1
F2
Figure 38. Ramped FSK Mode (Start at F2)
Rev. E | Page 21 of 52
F1
F2
AD9854

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