ANALOG-TO-DIGITAL CONVERSION CIRCUIT AND DIGITAL-TO-ANALOG CONVERSION CIRCUIT

摘要

PROBLEM TO BE SOLVED: To improve signal amplitude characteristics and to increase the number of effective bits by reflecting a control signal used to control a signal amplitude on an output signal.;SOLUTION: A signal level detecting means 3 is configured to digitally output a control signal making an analog input gain control means 2 select attenuating operation when the signal level of an input signal is higher than a predetermined level and to digitally output a control signal making the analog input gain control means 2 select amplifying operation when the signal level of the input signal is not higher than the predetermined level, the control signal being output to the outside together with the output of an analog-to-digital converter 4 digitally converting the output of the analog input gain control means 2.;COPYRIGHT: (C)2009,JPO&INPIT