
4-Channel, 500 MSPS DDS
with 10-Bit DACs
AD9959
Rev. B
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FEATURES
4 synchronized DDS channels @ 500 MSPS
Independent frequency/phase/amplitude control between
channels
Matched latencies for frequency/phase/amplitude changes
Excellent channel-to-channel isolation (>65 dB)
Linear frequency/phase/amplitude sweeping capability
Up to 16 levels of frequency/phase/amplitude modulation
(pin-selectable)
4 integrated 10-bit digital-to-analog converters (DACs)
Individually programmable DAC full-scale currents
0.12 Hz or better frequency tuning resolution
14-bit phase offset resolution
10-bit output amplitude scaling resolution
Serial I/O port interface (SPI) with enhanced data throughput
Software-/hardware-controlled power-down
Dual supply operation (1.8 V DDS core/3.3 V serial I/O)
Multiple device synchronization
Selectable 4× to 20× REFCLK multiplier (PLL)
Selectable REFCLK crystal oscillator
56-lead LFCSP package
APPLICATIONS
Agile local oscillators
Phased array radars/sonars
Instrumentation
Synchronized clocking
RF source for AOTF
FUNCTIONAL BLOCK DIAGRAM
(4)
500MSPS
DDS CORES
REF CLOCK
INPUT CIRCUITRY
TIMING AND
CONTROL
MODULATION
CONTROL
SYSTEM
CLOCK
SOURCE
USER INTERFACE
RECONSTRUCTED
SINE WAVE
RECONSTRUCTED
SINE WAVE
RECONSTRUCTED
SINE WAVE
RECONSTRUCTED
SINE WAVE
10-BIT DAC
05
24
6-
1
01
Figure 1.