add a resistor ladder on the d flip flop outputs and you get a dac. AND gate is removed, pin2 is a passthrough
attach a r2r ladder and a non-inverting op-amp on the output and you can control the adc output
resistors, opamp, and you
| # | Input | Output |
|---|---|---|
| 0 | clock | segment a |
| 1 | reset | segment b |
| 2 | segment c | |
| 3 | segment d | |
| 4 | segment e | |
| 5 | segment f | |
| 6 | segment g | |
| 7 |