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图1a所示的这种积分式3V的A/D转换器体积小,不需负电源和昂贵的精密元器件,仅耗用10μA这样的极小的电流。一次转换包括执行12,000次比较操作,大约只花300ms。每一次比较之后,μC将关闭IC_(2A)高限比较开关和IC_(2B)低限比较开关。这两个比较开关或者把V_(REF)(12V)接至它们的“B”端,或者把地端接至它们的“B”端,从而产生一种脉冲宽度调制(PWM)信号。R_1和C_1参照C_(IN)对此信号进行滤波和微秘分。IC_1把所得结果和转换器内部产生的1.2V的V_(REF)进行比较。
The integrated 3V A / D converter shown in Figure 1a is small in size and requires no negative supply and expensive precision components, consuming only very small currents of 10μA. A conversion involves performing 12,000 comparisons, only about 300ms. After each comparison, μC will turn off the IC_ (2A) high limit compare switch and the IC_ (2B) low limit compare switch. The two switches are either V_ (REF) (12V) connected to their “B” terminals, or terminated to their “B” terminals to produce a pulse width modulated (PWM) signal. R_1 and C_1 reference C_ (IN) on the signal filtering and micro-secret. IC_1 compares the result to the V_ (REF) of 1.2V generated inside the converter.