| 摘要 |
PURPOSE:To attain accurate setting of a grain with simple configuration, to attain ease of revision and high density mount with simple configuration by providing a D/A converter supplying an analog current to a gain adjustment analog input terminal of an amplifier based on output data of a rewritable memory to the circuit. CONSTITUTION:This circuit is provided with a D/A converter 11 supplying an analog current to a gain adjustment analog input terminal 3 of a differential amplifier circuit 1 based on output data of a rewritable memory 10. The memory 10 has a rewrite terminal 10a, output data are decoded by a decoder 12, a decode output controls a current generating section 13 to set current value circuits 14-17. The gain of the circuit 1 corresponds to an analog current output depending on the combination of the set circuits 14-17. Furthermore, the setting or revision of the gain is implemented by rewriting the memory 10 through the terminal 10a. Thus, accurate setting and easy revision of the gain and high density mount are attained with simple configuration. |
