ADS8864

Analog Inputs

LED

Photo

Detector

Bridge Sensor

Thermocouple

Current

Sensing

Optical Sensor

OPA192

-

+

GND

TMUX6104

Multiplexer

Gain / Filter

Network

Copyright © 2018, Texas Instruments Incorporated

21

TMUX6104

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SCDS376A – FEBRUARY 2018 – REVISED SEPTEMBER 2018

Product Folder Links: TMUX6104

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Copyright © 2018, Texas Instruments Incorporated

9 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

9.1 Application Information

The TMUX6104 offers outstanding input/output leakage currents and ultralow charge injection. These devices

operate up to 33 V, and offer true rail-to-rail input and output. The on-capacitance of the TMUX6104 is very low.

These features makes the TMUX6104 a precision, robust, high-performance analog multiplexer for high-voltage,

industrial applications.

9.2 Typical Application

Figure 33 shows a 16-bit, differential, 4-channel, multiplexed, data-acquisition system. This example is typical in

industrial applications that require low distortion and a high-voltage input. The circuit uses the ADS8864, a 16-bit,

400-kSPS successive-approximation-resistor (SAR) analog-to-digital converter (ADC), along with a precision,

high-voltage, signal-conditioning front end, and a 4-channel single-ended mux. This TI Precision Design details

the process for optimizing the precision, high-voltage, front-end drive circuit using the TMUX6104 and OPA192 to

achieve excellent dynamic performance and linearity with the ADS8864.

Figure 33. 16-Bit Precision Multiplexed Data-Acquisition System for High-Voltage Inputs With Lowest

Distortion