OPA191_0017 datasheet(33/51 Pages) TI1

Part #	OPA191_0017

Description	36-V, Low Power, Precision, CMOS, Rail-to-Rail Input/Output, Low Offset Voltage, Low Input Bias Current Op Amp

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SAR

ADC

REFP

VINP

VINM

1

4:2

Mux

+

Antialiasing

Filter

Gain

Network

Gain

Network

High-Voltage Level Translation

VCM

High-Voltage Multiplexed Input

Reference Driver

2

4

Voltage

Reference

RC Filter

Buffer

RC Filter

16 Bits

400 kSPS

Delay

Digital Counter For Multiplexer

CONV

5

3

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

n

CH0+

CH0-

CH3+

CH3-

OPA191

OPA140

OPA191

Gain

Network

33

OPA191, OPA2191, OPA4191

www.ti.com

SBOS701A – DECEMEBER 2015 – REVISED APRIL 2016

Product Folder Links: OPA191 OPA2191 OPA4191

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Typical Applications (continued)

9.2.2 16-Bit Precision Multiplexed Data-Acquisition System

Figure 64 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

application example shows the process for optimizing the precision, high-voltage, front-end drive circuit using the

OPA191 and OPA140 to achieve excellent dynamic performance and linearity with the ADS8864. The full TI

Precision Design can be found in TIDU181.

Figure 64. OPA191 in 16-Bit, 400-kSPS, 4-Channel, Multiplexed Data Acquisition System for High-Voltage

Inputs With Lowest Distortion

9.2.2.1 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:

•

System supply voltage: ±15 V

•

ADC supply voltage: 3.3 V

•

ADC sampling rate: 400 kSPS

•

ADC reference voltage (REFP): 4.096 V

•

System input signal: A high-voltage differential input signal with a peak amplitude of 10 V and frequency

(fIN) of 10 kHz are applied to each differential input of the mux.

9.2.2.2 Detailed Design Procedure

The purpose of this application example is to design an optimal, high-voltage, multiplexed, data-acquisition

system for highest system linearity and fast settling. The overall system block diagram is shown in Figure 64.

The circuit is a multichannel, data-acquisition, signal chain consisting of an input low-pass filter, multiplexer

(mux), mux output buffer, attenuating SAR ADC driver, digital counter for the mux, and the reference driver. The

architecture allows fast sampling of multiple channels using a single ADC, providing a low-cost solution. The two

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