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I would like get some help with this. This is the 2nd time I use Tikz and I'm trying to draw the following in latex.
. I started with the script in Drawing a multiple input - multiple output system diagram with TiKz
I tried to look up how to modify it to look like the one I want but no success. I would appreciate your help with this.

documentclass[border=3mm,

               tikz]{standalone}

usetikzlibrary{arrows,positioning}

    begin{document}

begin{tikzpicture}[

node distance = 4mm and 22mm]

node (adc) [draw,minimum size=24mm] {ADC};

coordinate[above left = of adc.west]   (a1);

coordinate[below = of a1]              (a2);

coordinate[below = of a2]              (a3);

coordinate[above right= 8mm and 22mm of adc.east]  (b1);

coordinate[above right = of adc.east]   (A1);

coordinate[below = of A1]              (A2);

coordinate[below = of A2]              (A3);

coordinate[above left= 8mm and 22mm of adc.west]  (b2);

foreach i [count=xi from 1] in {X,Y,Z}

draw[-latex']  (axi) node[left] {i} -- (axi-| adc.west);

foreach i [count=xi from 1] in {A,B,C}

draw[-latex']  (Axi-| adc.east) -- (Axi) node[right] {i};

end{tikzpicture}

    end{document}

The arrows library has been superseded by arrows.meta.

documentclass[border=3.14mm,tikz]{standalone}

usetikzlibrary{arrows.meta,positioning}

begin{document}

tikzset{% https://tex.stackexchange.com/a/156990/121799

  dots/.style args={#1per #2}{%

    line cap=round,

    dash pattern=on 0 off #2/#1

  }

}



begin{tikzpicture}[>=Latex]

node (adc) [draw,minimum size=24mm]at (0,0) {ADC} ;

coordinate[right=4cm of adc] (r);

coordinate[below=1cm of adc] (b);

foreach X/Z [count=Y] in {0.1/1,0.5/2,1.8/n}

{node[below left=X*1cm and 2cm of adc.north west] (yY) {$y_Z$};

draw[->] (yY) -- (yY-|adc.west) coordinate[pos=Y/4] (auxY);

node[draw,below right=X*1cm and {(2.5-X)*1cm} of adc.north east,circle,inner sep=3pt] (y'Y) {};

draw[->] (y'Y-|adc.east) --  node[pos=0.5,above]{$widehat{y}_Y$} (y'Y);

draw[->] (y'Y) -- (y'Y-|r) node[right]{$r_Z'$};

draw[->] (auxY) |- ([yshift={(-1+Y*0.5)*1cm}]b) -| (y'Y);

}

draw[very thick,dots={6 per 1cm}] ([yshift=1mm]aux3) -- ([yshift=-1mm]aux2 -| aux3);

draw[very thick,dots={6 per 1cm}] ([yshift=1mm]y'3.north) -- ([yshift=-1mm]y'2 -| y'3);

end{tikzpicture}

end{document}