MC1403是2.5V的参考电压源，可以通过改变电阻的大小调节电压的大小，从而得到不同的电压。-The MC1403 is a serial 2.5V bandgap voltage ref-
erence. The major advantages are the 1 preci-
sion, thewide input voltagerange (4.5Vto 40V) and
the low quiescent current (1.5mA max.)
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