D/A converter with means to prevent output signal instability

摘要

A D/A converter of the type provided with an amplifier to produce the analog output signal and formed as an IC chip. The chip includes a power voltage monitor to sense when the applied DC voltage is above a preset lower level and below a preset upper level. When that condition is sensed, the monitor activates a control circuit which in turn opens a transmission gate between the amplifier output circuit and the converter output terminal, and closes a transmission gate between the output terminal and ground. When the DC voltage goes above the preset upper level, and a valid digital word is loaded into the converter register and presented for conversion, the condition of the transmission gates is reversed to provide for normal operation of the converter.