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UCC21750芯片AIN端口使用问题

Other Parts Discussed in Thread: UCC21750

关于UCC21750芯片AIN口用于采集IGBT结温(通过片上温敏二极管)时有些疑问: 
 1)目前的IGBT片上温敏二极管采样的设计流通电流大多为1mA左右,而21750芯片的电流源大小为200uA无法满足采样要求,当时设计芯片是怎么考虑的?

2)   如果要用于采集,如何改进电路以满足需求?