TMUX1113 datasheet(28/44 Pages) TI2

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9.3.1 Design Requirements

For this design example, use the parameters listed in Table 9-1.

Table 9-1. Design parameters

PARAMETERS

VALUES

Supply (VDD)

3.3V

Input / Output signal range

0µA to 10µA

Control logic thresholds

1.8V compatible

9.3.2 Detailed Design Procedure

The TMUX111x 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 recommend operating conditions of

the TMUX111x 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 max 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 TMUX111x 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 TMUX111x 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 go 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 vs. percent overshoot.

9.3.3 Application Curve

The TMUX1111 is 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)

0.5

1.5

2.5

3.5

-20

-15

-10

-5

VDD = 3.63 V

VDD = 1.98 V

VDD = 1.32 V

D005

TA = 25°C

Figure 9-6. On-Leakage vs Source or Drain Voltage

TMUX1111, TMUX1112, TMUX1113

SCDS408C – FEBRUARY 2019 – REVISED DECEMBER 2023

www.ti.com

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