1 Features
• 16-bit, 12/24-GSPS, Multi-Nyquist DAC core
• Maximum input data rate:
– 8-bit, Single channel, DES mode: 24 GSPS
– 12-bit, Single channel, DES mode: 15.5 GSPS
– 16-bit, Single channel: 12 GSPS
– 8-bit, Dual channel, 12 GSPS
– 12-bit, Dual channel: 7.75 GSPS/ch
– 16-bit, Dual channel: 6.2 GSPS/ch
• Output bandwidth (-3dB): 12 GHz
• Performance at fOUT = 2.997 GHz, DES2XL mode,
DEM/Dither off
– Noise floor (small signal): –155 dBFS/Hz
– SFDR (-0.1dBFS) : –60 dBc
– IMD3 (-7dBFS each tone) : –60 dBc
– Additive phase noise, 10 kHz offset: -137
dBc/Hz
• Four integrated digital up-converters (DUC)
– Interpolation: 1x, 2x, 3x, 4x, 6x, 8x ... 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 200 MHz clock
– 60 ns reconfiguration (32-bit frequency)
– Any frequency hopping with phase coherence
• JESD204C Interface
– Up to 16 Lanes at up to 12.8 Gbps
– 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)

3 Description
The DAC39RF12 and 'RFS12 are a family of dual and
single channel digital-to-analog converters (DAC) with
16-bit resolution. The devices can be used as noninterpolating
or interpolating DACs for either direct RF
sampling or complex baseband signal generation. The
maximum input data rate is 24 GSPS for a single
channel or 12 GSPS for two channels. The devices
can generate signals of up to 12, 7.5, and 6 GHz
signal bandwidth (8, 12, and 16-bit input resolution) at
carrier frequencies exceeding 10 GHz enabling direct
sampling through C-band and into X-band.
The high sampling rate, output frequency range, 64-
bit NCO frequency resolution and any frequency
hopping with phase coherence also makes the device
capable of arbitrary waveform generation (AWG) and
direct digital synthesis (DDS).
A JESD204B and JESD204C compatible serial
interface has 16 receiver pairs capable of up to 12.8
Gbps. The interface is JESD204B and JESD204C
subclass-1 compliant for deterministic latency and
multi-device synchronization through the use of
SYSREF.