2-Channel, 500 MSPS DDS
with 10-Bit DACs
AD9958
FEATURES
2 synchronized DDS channels @ 500 MSPS
Independent frequency/phase/amplitude control between
channels
Matched latencies for frequency/phase/amplitude changes
Excellent channel-to-channel isolation (>72 dB)
Linear frequency/phase/amplitude sweeping capability
Up to 16 levels of frequency/phase/amplitude modulation
(pin-selectable)
2 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 800 Mbps 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
APPLICATIONS
Agile local oscillators
Phased array radars/sonars
Instrumentation
Synchronized clocking
RF source for AOTF
Single-side band suppressed carriers
Quadrature communications
FUNCTIONAL BLOCK DIAGRAM
AD9958
(2)
500MSPS
DDS CORES
10-BIT
DAC
10-BIT
DAC
RECONSTRUCTED
SINE WAVE
RECONSTRUCTED
SINE WAVE
MODULATION CONTROL
SYSTEM
CLOCK
SOURCE
REF CLOCK
INPUT CIRCUITRY
TIMING AND
CONTROL
05252-000
USER INTERFACE
Figure 1.
Rev. A
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