3 High-Speed Transmit DAC's for Aerospace and Defence Applications

ADI’s 14-bit dual-channel AD9117, 16-bit dual-channel AD9122 and 14-bit single-channel AD9739 transmit DACs were designed for signal synthesis applications, including pulse-modulated waveform generation and for synthesising the modulated carrier in quadrature digital architectures.



In addition to extended temperature ranges, some aerospace and defence applications require an alternate solution to matte tin for lead-frame packages in order to eliminate the concern with the whiskering associated with the Sn plating process. These DACs are available in NiPdAu lead-frame or Pb BGA packaging, as applicable, to avoid the issue of whiskering. The NiPdAu lead-frame package is assembled with low halogen/halogen-free RoHS-compliant materials and the entire lead-frame is pre-plated.



AD9117 Dual-channel D/A Converter for Baseband Synthesis Features and Benefits:

•SFDR to Nyquist:

o86 dBc @ 1 MHz output

o85 dBc @ 10 MHz output

•NSD @ 10 MHz output, 125 MSPS, 20 mA: −157 dBc/Hz

•Differential current outputs: 4 mA to 20 mA

•-40° C to +85° C operating temperature range.

•NiPdAu lead-frame packaging



AD9122EP Dual-channel D/A Converter for IF Synthesis Features and Benefits:

•72 dBc SFDR performance with fDAC = 800 MSPS, fOUT = 70 MHz

•Analog output: adjustable 8.7 mA to 31.7 mA, RL = 25 Ω to 50 Ω

•Novel 2×/4×/8× interpolator/complex modulator allows carrier placement anywhere in the DAC bandwidth

•-55° C to +105° C operating temperature range.

•NiPdAu lead-frame packaging



AD9739 Single-channel D/A Converter for RF Synthesis Features and Benefits:

•Industry leading single/multicarrier IF or RF synthesis

o60 dBc SFDR performance with fDAC = 2400 MSPS, fOUT = 950 MHz

•-40° C to +85° C operating temperature range

•Pb BGA packaging



Pricing, Availability and Complementary Products:



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Complementary products include the AD9266-EP 16-Bit, 65-MSPS, 1.8-V A/D converter with an on-chip sample-and- hold circuit that enables the device to maintain excellent performance with input frequencies up to 200 MHz. This device operates over the full military temperature range of −55°C to +125° C and is designed for low cost, low power, small size, and ease of use.