9.3.2 Detailed Design Procedure

The TMUX110x devices can be operated without any external components except for the supply decoupling

capacitors. All inputs signals passing through the switch must fall within the recommended operating conditions

of the TMUX110x, including signal range and continuous current. For this design example, with a supply of 3.3V,

the signals can range from 0V to 3.3V when the device is powered. The maximum continuous current can be

30mA.

Photodiodes commonly have a current output that ranges from a few hundred picoamps to tens of microamps

based on the amount of light being absorbed. The TMUX110x devices have a typical On-leakage current of less

than 10pA, which would lead to an accuracy well within 1% of a full scale 10µA signal. The low ON and OFF

capacitance of the TMUX110x improves system stability by minimizing the total capacitance on the output of the

amplifier. Lower capacitance leads to less overshoot and ringing in the system, which can cause the amplifier

circuit to become unstable if the phase margin is not at least 45°. Refer to Improve Stability Issues with Low CON

Multiplexers for more information on calculating the phase margin versus percent overshoot.

9.3.3 Application Curve

The TMUX110x devices are capable of switching signals from high source-impedance inputs into a high input-

impedance op amp with minimal offset error because of the ultra-low leakage currents.

VS or VD - Source or Drain Voltage (V)

0

0.5

1

1.5

2

2.5

3

3.5

4

-20

-15

-10

-5

0

5

10

15

20

VDD = 3.63 V

VDD = 1.98 V

VDD = 1.32 V

D005

TA = 25°C

Figure 9-5. On-Leakage vs Source or Drain Voltage

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TMUX1101, TMUX1102

SCDS410D – MARCH 2019 – REVISED FEBRUARY 2024

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