AD9737A Datasheet

• Direct RF synthesis at 2.5 GSPS update rate
  • DC to 1.25 GHz in baseband mode
  • 1.25 GHz to 3.0 GHz in mix-mode
• Industry leading single/multicarrier IF or RF synthesis
• Dual-port LVDS data interface
  • Up to 1.25 GSPS operation
  • Source synchronous DDR clocking
• Pin compatible with the AD9739
• Programmable output current: 8.7 mA to 31.7 mA
• Low power: 1.1 W at 2.5 GSPS

• Broadband communications systems
  • DOCSIS CMTS systems
• Military jammers
• Instrumentation, automatic test equipment
• Radar, avionics

The AD9737A are 11-bit, 2.5 GSPS high performance RF DACs that are capable of synthesizing wideband signals from dc up to 3 GHz. The AD9737A are pin and functionally compatible with the AD9739 with the exception that the AD9737A do not support synchronization or RZ mode, and are specified to operate between 1.6 GSPS and 2.5 GSPS.

By elimination of the synchronization circuitry, some nonideal artifacts such as images and discrete clock spurs remain stationary on the AD9737A between power-up cycles, thus allowing for possible system calibration. AC linearity and noise performance remain the same between the AD9739 and the AD9737A.

The inclusion of on-chip controllers simplifies system integration. A dual-port, source synchronous, LVDS interface simplifies the digital interface with existing FGPA/ASIC technology. On-chip controllers are used to manage external and internal clock domain variations over temperature to ensure reliable data transfer from the host to the DAC core. A serial peripheral interface (SPI) is used for device configuration as well as readback of status registers.

The AD9737A are manufactured on a 0.18 µm CMOS process and operate from 1.8 V and 3.3 V supplies. They are supplied in a 160-ball chip scale ball grid array for reduced package parasitics.