Trying to multiplex voltage reference gives incorrect output

Question

I'm trying to make the voltage reference for an INA214 opamp selectable between GND, 4.5V and 10V. I'm using a CD4051B multiplexer.

However, the 10V VREF gets pulled down to 5.84V, and I can't figure out why.

^{simulate this circuit – Schematic created using CircuitLab}

CD4051B has:

• INH, Vee, Vss to GND
• C to GND
• A, B to 5V (thus selecting CH3 as output)
• CH3 to GND
• CH1 to D1 output
• CH2 to D2 output
• Output measured by multimeter

Output measures:

• 4.95V when D2 is connected to any pin on the mux
• 0V when D2 is not connected
• 4.54V when B is GND, no matter if A is 5V or GND (D2 is not connected)

which is strange, because CH1 is A=1 B=0.

What is going here? Are the TL431s interfering with the function of the CD4051B, or...?

By the way, am I required to connect the other pins/channels to ground, or can they be floating?

Answer 1

As stated in comments, issue has to do with supply voltage to device and fixing that screws with the logic levels requiring additional components which makes the rationale for using the device itself suspect.

Alternative: Use two low RdsON MOSFETS to change the bias on the TL431 and or short the reference to ground.

^{simulate this circuit – Schematic created using CircuitLab}