| 摘要 |
PURPOSE:To stably form an image with high accuracy by providing a latch circuit for digital data, its control circuit, a D/A converting circuit, a reference power source circuit supplying the converting circuit and a buffer amplifying device on a semiconductive chip. CONSTITUTION:Digital data of eight bits is inputted to terminals D0-D7 in the latch circuit 1 from a CPU. The chip select terminal 20 of a control logic 2 supplying a latch timing pulse, etc., to the latch circuit 1 is connected to the decoder circuit of the CPU, while a chip enable terminal 21 is connected to a write enable terminal. When the terminals 20 and 21 are simultaneously at 'L', data inputted to the input terminal of the circuit 1 is outputted to a D/A converter 3 as it is. When the terminal 20 and/or terminal 21 changes from 'L' to 'H', the data inputted to the input terminal of the circuit 1 is latched by the circuit 1. By referring to a voltage outputted from the reference power source circuit 4, the converter 3 converts the data from the circuit 1 into analog signals, and a buffer amplifier 5 further converts it into a voltage and outputs the voltage. |
