Dual 12-/14-/16-Bit 800 MSPS DAC
with Low Power 32-Bit Complex NCO
AD9785/AD9787/AD9788 Data Sheet
FEATURES GENERAL DESCRIPTION Analog output: adjustable 8.7 mA to 31.7 mA,
RL = 25 О© to 50 О©
Low power, fine complex NCO allows carrier placement
anywhere in DAC bandwidth while adding <300 mW power
Auxiliary DACs allow I and Q gain matching and offset control
Includes programmable I and Q phase compensation
Internal digital upconversion capability
Multiple chip synchronization interface
High performance, low noise PLL clock multiplier
Digital inverse sinc filter
100-lead, exposed pad TQFP package The AD9785/AD9787/AD9788 are 12-bit, 14-bit, and 16-bit,
high dynamic range TxDACВ® devices, respectively, that provide
a sample rate of 800 MSPS, permitting multicarrier generation
up to the Nyquist frequency. Features are included for optimizing
direct conversion transmit applications, including complex
digital modulation, as well as gain, phase, and offset compensation. The DAC outputs are optimized to interface seamlessly
with analog quadrature modulators, such as the ADL5375
family from Analog Devices, Inc. A serial peripheral interface
(SPI) provides for programming and readback of many internal
parameters. Full-scale output current can be programmed over …