R

1

R

2

REF

1.25V

Internal

Reference

Foroutput

signals>comparatortrip-point.

(a)

INA193-INA198outputadjustedbyvoltagedivider.

TLV3012

REF

1.25V

Internal

Reference

R

1

R

2

Forusewith

smalloutputsignals.

(b)

Comparatorreferencevoltageadjustedbyvoltagedivider.

TLV3012

OUT

V

IN+

V

IN-

V+

INA193-INA198

OUT

V

IN+

V

IN-

V+

INA193-INA198

16

INA193, INA194, INA195

INA196, INA197, INA198

SBOS307G – MAY 2004 – REVISED JANUARY 2015

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Product Folder Links: INA193 INA194 INA195 INA196 INA197 INA198

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Copyright © 2004–2015, Texas Instruments Incorporated

Figure 24. INA193-INA198 with Comparator

8.4 Device Functional Modes

8.4.1 Input Filtering

An obvious and straightforward location for filtering is at the output of the INA193-INA198 devices; however, this

location negates the advantage of the low output impedance of the internal buffer. The only other option for

filtering is at the input pins of the INA193-INA198 devices, which is complicated by the internal 5-kΩ + 30% input

impedance; this is illustrated in Figure 25. Using the lowest possible resistor values minimizes both the initial shift

in gain and effects of tolerance. The effect on initial gain is given by Equation 1: