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TLV5636推荐的REF是2.048V, 因为这样最大输出可以是4.096V, 满足VDD=5V是时VDD-0.4V的输出限制，否则用1.024做基准，VDD=3V时。见datasheet第三页说明：Due to the x2 output buffer, a reference input voltage . (VDD - 0.4 V)/2 causes clipping of the transfer function. The output buffer of the internal reference must be disabled, if an external reference is used.
The output buffer of the internal reference must be disabled, if an external reference is used. If external reference voltage is applied to the REF pin, external reference MUST be selected.
