TMUX1111 datasheet(27/44 Pages) TI2

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9.2.3 Application Curve

TMUX1111, TMUX1112, andTMUX1113 have excellent charge injection performance and ultra-low leakage

current, making them excellent choices to minimize sampling error for the sample and hold application.

VS - Source Voltage (V)

-20

-15

-10

-5

VDD = 5 V

VDD = 3.3 V

D011

TA = -40°C to +125°C

Figure 9-3. Charge Injection vs Source Voltage

VS or VD - Source or Drain Voltage (V)

-80

-60

-40

-20

D006

VDD= 5V

Figure 9-4. On-Leakage vs Source or Drain Voltage

9.3 Typical Application - Switched Gain Amplifier

Switches and multiplexers are commonly used in the feedback path of amplifier circuits to provide configurable

gain control. By using various resistor values on each switch path the TMUX111x allows the system to have

multiple gain settings. An external resistor, or utilizing 1 channel always being closed, causes the amplifier to

not operate in an open loop configuration. A transimpedance amplifier (TIA) for photodiode inputs is a common

circuit that requires gain control using a multi-channel switch to convert the output current of the photodiode into

a voltage for the MCU or processor. The leakage current, capacitance, and charge injection performance of the

TMUX111x are key specifications to evaluate when selecting a device for gain control.

RF_1

RF_2

RF_3

RF_4

IPD

SEL2

SEL4

SEL3

SEL1

Processor

VDD

VI/O

1.8V Logic I/O

VDD

0.1µF

Gain / Filter

Network

VDD

Digital Processing

ADC

AMP

VDD

Figure 9-5. Switching Gain Settings of a TIA circuit

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TMUX1111, TMUX1112, TMUX1113

SCDS408C – FEBRUARY 2019 – REVISED DECEMBER 2023

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