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dac900用opa637做iv转换

Other Parts Discussed in Thread: DAC900, OPA637, OPA211, OPA627

opa637连接如图,2脚接dac900互补电流。da的full-scale电流是20mA,当da的data输入0x000时Vout约为-1V,但是输入0x3FF是Vout才0.5V左右。如果把da的两个电流输出直接接50欧电阻到地,一个是1V,一个是0V,正常输出,接上opa637就不正常了,请问哪里出问题了。