INA159 datasheet(29/51 Pages) TI2

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INA Out

SW2

ADC_Diff

RG 49.9 k

Amp Out

Vin

SW1

R4 250

VoltageInput

CurrentInput

Iin

Source_Switch

Ref 1

Ref 2

Sense

U1 INA159

Vs 5

Vref 2.5

Ref

U2 INA826

Vin

Iin

+ Terminal

- Terminal

V1 15

V2 15

+Vs

-Vs

+Vs

-Vs

INA826

www.ti.com

SBOS562G – AUGUST 2011 – REVISED JUNE 2020

Product Folder Links: INA826

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System Examples (continued)

9.3.3 Using TINA-TI SPICE-Based Analog Simulation Program With the INA826

TINA is a simple, powerful, and easy-to-use circuit simulation program based on a SPICE engine. TINA-TI is a

free, fully-functional version of the TINA software, preloaded with a library of macromodels in addition to a range

of both passive and active models. TINA provides all the conventional dc, transient, and frequency domain

analysis of SPICE as well as additional design capabilities.

Available as a free download from the Analog eLab Design Center, TINA-TI offers extensive post-processing

capability that allows users to format results in a variety of ways. Virtual instruments offer users the ability to

select input waveforms and probe circuit nodes, voltages, and waveforms, creating a dynamic quick-start tool.

Figure 68 and Figure 70 illustrate example TINA-TI circuits for the INA826 that can be used to develop, modify,

and assess the circuit design for specific applications. Links to download these simulation files are provided in

this section.

NOTE

These files require that either the TINA software (from DesignSoft) or TINA-TI software be

installed. Download the free TINA-TI software from the TINA-TI folder.

The circuit in Figure 68 is used to convert inputs of ±10 V, ±5 V, or ±20 mA to an output voltage range from 0.5 V

to 4.5 V. The input selection depends on the settings of SW1 and SW2. Further explanation as well as the TINA-

TI simulation circuit is provided in the compressed file that can be downloaded at the following link: PLC Circuit.

Figure 68. Two-Terminal Programmable Logic Controller (PLC) Input

Figure 69 is an example of a LEAD I ECG circuit. The input signals come from leads attached to the right arm

(RA) and left arm (LA). These signals are simulated with the circuitry in the corresponding boxes. Protection

resistors (RPROT1 and RPROT2) and filtering are also provided. The OPA333 is used as an integrator to remove the

gained-up dc offsets and servo the INA826 outputs to VREF. Finally, the right leg drive is biased to a potential

(+VS / 2), and inverts and amplifies the average common-mode signal back into the patient's right leg. This

architecture reduces the 50-Hz and 60-Hz noise pickup.

INA159 Datasheet(PDF) 29 Page - Texas Instruments

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