Hello,

My design is about a SAR system and I want to control the output of the I&Q Modulator (AD8346) using the AD9761. I have done the same schematic as the figure 28 of the AD8346's datasheet and the idea is to control the DAC's with an Arduino Micro.

My question is, does anybody know how to introduce to the AD9761 the data bits? I've found that when all data bits are at Logic 1 IOUTA (or QOUTA) produces a full-scale output current, aprox. 10mA and IOUTB (or QOUTB) produces a complementary output.

Says anywhere which output is produced by the input code? I haven't find it.

Thanks a lot!!!!

Pep

Hi Pep,

AD9761 team can give better answer. However, Please refer to the section, called " DAC Transfer Function" on page 11 of AD9761 datasheet. Equation (1) and (2) show how much currents there are on IOUTA and IOUTB according to the Input Digital Data code. Same equations are for QOUTA and QOUTB. DAC codes for I and Q should be the digital data of in-phase (for I) and quad-phase(for Q). I hope this is what you are asking.

Thanks

Tony