What load can each VCM pin drive before a buffer should be added?
I am looking at driving 4x 50K loads ie. 12K5 from one VCM pin.
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I do not know if this is still of value to you, but VCM1 and VCM2 of AD9681 each will not have a problem with a 12.5kOhm load. You can get an indication of the drive capability from Figure 40 in the AD9681 datasheet. Figure 40 is for VREF, but its drive capability is very close to VCM1 and VCM2.
I'm sorry about the delayed response.
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