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CWD IV amplifier driving capability


In AD9278, using ADA4841 as IV amplifier. But it mention that one ADA4841 has maximum sum number (4 AD9278s, 32 channels). If we use ADA4896 as IV & summing amplifier, how to calculate the number of channel can be summed in one ADA4896? Note that, the input circuit of summing amplifier is 1K ohm series 2.2uF for one IV output, feedback network is 20K ohm parallel 150pF. (same as reference schematic) And IV transimpedance is 255 ohm.