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问 AD7886的资料上说，其内部自带两个分压电阻，只需外部接一个运放和给一个5V基准就可以得到其所需的－3.5v基准。但实事上并不是如此。外接运放必须用电阻分压自己形成-3.5v。是这样么？洋鬼子的Datasheet是骗人的还是我用错了？ 答 1: 无需使用外部分压电阻。按照参考图连接即可。Figure 2. TyPICal Reference Circuitry 答 2: 原厂文件一般不会有问题的All rights reserved. This publication, or parts thereof, may not be reproduced in any form without permission of the copyright owner.Information furnished by Analog Devices, Inc. is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices, Inc. for its use.