Dual 12-/14-/16-Bit,
1 GSPS, Digital-to-Analog Converters
AD9776/AD9778/AD9779
FEATURES GENERAL DESCRIPTION Low power: 1.0 W @ 1 GSPS, 600 mW @ 500 MSPS,
full operating conditions
SFDR = 78 dBc to fOUT = 100 MHz
Single carrier WCDMA ACLR = 79 dBc @ 80 MHz IF
Analog output: adjustable 8.7 mA to 31.7 mA,
RL = 25 О© to 50 О©
Novel 2Г—, 4Г—, and 8Г— interpolator/coarse complex modulator
allows carrier placement anywhere in DAC bandwidth
Auxiliary DACs allow control of external VGA and offset control
Multiple chip synchronization interface
High performance, low noise PLL clock multiplier
Digital inverse sinc filter
100-lead, exposed paddle TQFP package The AD9776/AD9778/AD9779 are dual, 12-/14-/16-bit, high
dynamic range, digital-to-analog converters (DACs) that provide a sample rate of 1 GSPS, permitting multicarrier generation
up to the Nyquist frequency. They include features optimized
for direct conversion transmit applications, including complex
digital modulation, and gain and offset compensation. The DAC
outputs are optimized to interface seamlessly with analog quadrature modulators such as the AD8349. A serial peripheral interface
(SPIВ®) provides for programming/readback of many internal
parameters. Full-scale output current can be programmed over a …