一般都用MDAC做程控放大,不知道TI的MDAC内部电阻多大?比如说 DAC7802 DAC8043 DAC8811.
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7802手册第十页右下角有提到“where R is the ladder resistance of the DAC (typical value, 10kΩ)”。你指的是这只电阻吗?
可以试一试把Iout这个输出脚短路到地,用万用表测一下从RFB到Iout的电阻,应该可以测出来的。