Digital voltmeter 0-100V on the basis of the successive-approximation ADC

I propose a digital voltmeter circuit based on a serial approximation ADC with limits of 0-9V, 0-100V. The advantages include a high conversion rate (the diagram shows a speed of about 1000 samples per second). Among the disadvantages, I can note some complexity of the scheme. If you apply the sequential approximation register, the scheme is much simpler (as long as the simulator does not have a model of the sequential approximation register). The scheme works simply: the input voltage is converted to a binary code in 14 cycles (hence the high conversion speed), then it is fed to the display module, which outputs the resulting code to the indicator. It couldn't be easier. I do not consider microcontrollers. Everything is done on logic chips.

Updated circuit of the voltmeter. The scheme uses the sequential approximation registers 74XX503.