A1

A2

RL

(1)

VIN+

VIN

V+

OUT

INA193-INA198

R1

(1)

5 k:

G = 20, RL = 100 k:

G = 50, RL = 250 k:

G = 100, RL = 500 k:

R1

(1)

5 k:

GND

13

INA193, INA194, INA195

INA196, INA197, INA198

www.ti.com

SBOS307G – MAY 2004 – REVISED JANUARY 2015

Product Folder Links: INA193 INA194 INA195 INA196 INA197 INA198

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Copyright © 2004–2015, Texas Instruments Incorporated

Feature Description (continued)

The differential input voltage, (VIN+) − (VIN−) applied across RS, is converted to a current through a resistor. This

current is converted back to a voltage through RL, and then amplified by the output buffer amplifier. When the

common-mode voltage is negative, amplifier A1 is active. The differential input voltage, (VIN+) − (VIN−) applied

across RS, is converted to a current through a resistor. This current is sourced from a precision current mirror

whose output is directed into RL converting the signal back into a voltage and amplified by the output buffer

amplifier. Patent-pending circuit architecture ensures smooth device operation, even during the transition period

where both amplifiers A1 and A2 are active.

(1) Nominal resistor values are shown. ±15% variation is possible. Resistor ratios are matched to ±1%.

Figure 21. INA193-INA198 Simplified Circuit Diagram