OPA4192IPWR datasheet(31/61 Pages) TI2

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SAR

ADC

REFP

VINP

VINM

4:2

Mux

Antialiasing

Filter

Gain

Network

Gain

Network

High-Voltage Level Translation

High-Voltage Multiplexed Input

Reference Driver

Voltage

Reference

RC Filter

Buffer

RC Filter

16 Bits

400 kSPS

Delay

Digital Counter For Multiplexer

CONV

Very Low Output Impedance

Input-Filter Bandwidth

High-Impedance Inputs

No Differential Input Clamps

Fast Settling-Time Requirements

Attenuate High-Voltage Input Signal

Fast-Settling Time Requirements

Stability of the Input Driver

Attenuate ADC Kickback Noise

VREF Output: Value and Accuracy

Low Temp and Long-Term Drift

Fast logic transition

±20-V,

10-kHz

Sine Wave

±20-V,

10-kHz

Sine Wave

Shmidtt

Trigger

Counter

REF3240

Voltage

Divider

OPA350

VCM Generation Circuit

CH0+

CH0-

CH3+

CH3-

OPA192

OPA140

OPA192

Gain

Network

OPA192, OPA2192, OPA4192

www.ti.com

SBOS620E – DECEMBER 2013 – REVISED NOVEMBER 2015

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 OPAx192 family offers outstanding dc precision and ac performance. These devices operate up to 36-V

supply rails and offer true rail-to-rail input/output, ultralow offset voltage and offset voltage drift, as well as

10-MHz bandwidth and high capacitive load drive. These features make the OPAx192 a robust, high-

performance operational amplifier for high-voltage industrial applications.

9.2 Typical Applications

9.2.1 16-Bit Precision Multiplexed Data-Acquisition System

Figure 66 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 differential 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 differential multiplexer (mux). This

TI Precision Design details the process for optimizing the precision, high-voltage, front-end drive circuit using the

OPA192 and OPA140 to achieve excellent dynamic performance and linearity with the ADS8864.

Figure 66. OPA192 in 16-Bit, 400-kSPS, 4-Channel, Multiplexed Data Acquisition System for High-Voltage

Inputs with Lowest Distortion

9.2.1.1 Design Requirements

The primary objective is to design a ±20 V, differential 4-channel multiplexed data acquisition system with lowest

distortion using the 16-bit ADS8864 at a throughput of 400 kSPS for a 10 kHz full-scale pure sine-wave input.

The design requirements for this block design are:

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