To shorten processing time in an AD/DA conversion combined apparatus.
The apparatus is provided with an input signal selection circuit which selects and outputs an analog signal from among a plurality of analog input signals; an input sample hold circuit which carries on sampling and holds; a D/A converter which converts a digital signal to an analog signal and outputs; a comparison circuit which outputs a comparison signal which shows the magnitude relation of the input analog signal from the input sample-and-hold circuit and the analog signal from the D/A converter; a successive comparison register which successively decides on each digit of the digital signal, based on the output comparison signal; a selection circuit which receives a stored digital signal, a digital input signal, and a conversion selective signal, outputs the digital signal to be stored in the successive comparison register, to the D/A converter in a case of A/D conversion, and outputs the digital input signal to the D/A converter, in the case of D/A conversion; and a control unit which outputs the input selective signal, in the case that the conversion selection signal indicates D/A conversion.
| JPH05268085 | A/D CONVERTER |
| JP2751177 | [Title of Invention] Digital-to-analog converter |
| JPS60145745 | [Title of the device] D/A conversion circuit |
YOSHIDA AKIRA
KAWAI TAICHIRO
| JPH07147541A | 1995-06-06 | |||
| JP2003224473A | 2003-08-08 | |||
| JPS5332651A | 1978-03-28 | |||
| JPS60182220A | 1985-09-17 |