| 摘要 |
PURPOSE:To facilitate making the two-way code converter for AD conversion and DA conversion into an integrated circuit, by using one reference power source and by using a part of the circuit for AD conversion and DA conversion in common. CONSTITUTION:Unipolar DACs 11 and 12 are provided which hold an input signal temporarily, and one unipolar DAC12 is used as a local demodulator for AD conversion, and the other unipolar DAC11 is switched to be used for holding an input signal during the polarity discrimination time for AD conversion and to be used as a DA converter for DA conversion. Thus, only one reference power source Vr is required, and the holding circuit is omitted, and therefore, the circuit scale is reduced to facilitate making this converter into an integrated circuit. |
