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.