Below is the reference circuit of CW output circuitry of AD9279, the first stage(U401) is an I to V conversion stage and the second stage(U403) is a 20X voltage amplifier.
According to the datasheet of AD9279, the CWI/Q outputs(CWI_POS/CWI_NEG on above schematic) are current output, with 1.5V DC level and +/-1.25mA full scale current.
Let's focus on the I to V stage, because DC level of CWI/Q output is 1.5V, and assuming the power supplies on ADA4841 is +/-5V, the maximum positive current output is limited to (5-1.5)/3.9K = 0.8974mA, which is far from the maximum output current 1.25mA.
My question is, can I replace R455/R456 to a big capacitor(i.e. 22uF) to block the 1.5V DC, and connect positive inputs of ADA4841(U401.3 / U401.6) to ground, so the maximum positive current output is 5/3.9k = 1.2821mA ?