1 Features
• 16-bit, 12 to 24GSPS, multi-Nyquist DAC cores
• Maximum input data rate:
– 16-bit, single channel complex I/Q: 775MSPS
– 16-bit, dual channel complex I/Q: 388MSPS
• Output bandwidth (-3dB): 12GHz
• Performance at fOUT = 2.997GHz, DES2XL mode,
DEM and Dither off
– Noise floor (small signal): -154dBFS/Hz
– SFDR (-0.1dBFS): 68dBc
– IMD3 (-7dBFS each tone): -74dBc
– Additive phase noise, 10kHz offset: -138dBc/Hz
• Four Integrated digital up-converters (DUC)
– Interpolation: 4x, 6x, 8x, 12x ... 256x
– Complex baseband DUC for I/Q output
– Complex to real up conversion for dual channel
direct RF sampling
– 64-bit frequency resolution NCOs
• Fast reconfiguration interface for fast frequency
hopping
– 4-bit data with 200MHz clock
– 60ns reconfiguration (32-bit frequency)
– Any frequency hopping with phase coherence
• JESD204C Interface
– Up to 2 Lanes at up to 12.8Gbps each
– Class C-S, subclass-1 compatible
– Internal AC coupling capacitors
• SYSREF Windowing for automatic SYSREF timing
calibration

2 Applications
• Satellite communications (SATCOM)
• Phased array antenna systems
• Synthetic aperture radar (SAR) exciter
• Wireless communications testers
• Arbitrary waveform generator (AWG)
• Agile, low phase noise LO generation

3 Description
DDS39RF12 and 'RFS12 are a family of dual and
single channel direct digital synthesizers with 16-bit
resolution digital-to-analog converters (DAC). The
high sampling rate, output frequency range, 64-bit
NCO frequency resolution and any frequency hopping
with phase coherence makes the device capable
of arbitrary waveform generation (AWG) and direct
digital synthesis (DDS).
The devices can also be used as interpolating
DACs for narrowband direct RF sampling or complex
baseband signal generation. The maximum input data
rate is 775MSPS for a single channel or 388MSPS for
two channels. The devices can generate signals of up
to 620MHz signal bandwidth (16-bit input resolution)
at carrier frequencies exceeding 10GHz enabling
direct sampling through C-band and into X-band.
A JESD204B and JESD204C compatible serial
interface has 2 receiver pairs capable of up to
12.8Gbps each. The interface is JESD204B and
JESD204C subclass-1 compliant for deterministic
latency and multi-device synchronization through the
use of SYSREF.