INA821 datasheet(20/43 Pages) TI2

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50 k

40 k

25 k

40 k

25 k

Overvoltage

Protection

Overvoltage

Protection

REF

+VS

V-

OUT

V+

-VS

-IN

+IN

50 k

REF

G V

INA818

SBOS894A – APRIL 2019 – REVISED JUNE 2019

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8.3 Feature Description

8.3.1 Setting the Gain

Figure 55 shows that the gain of the INA818 is set by a single external resistor (RG) connected between the RG

pins (pins 1 and 8).

Figure 55. Simplified Diagram of the INA818 With Gain and Output Equations

The value of RG is selected according to Equation 1:

(1)

Table 2 lists several commonly-used gains and resistor values. The 50-kΩ term in Equation 1 comes from the

sum of the two internal 25-kΩ feedback resistors. These on-chip resistors are laser-trimmed to accurate absolute

values. The accuracy and temperature coefficients of these resistors are included in the gain accuracy and drift

specifications of the INA818. As shown in Figure 55 and explained in more details in the Layout section, make

sure to connect low-ESR, 0.1-µF ceramic bypass capacitors between each supply pin and ground that are placed

as close to the device as possible.

Table 2. Commonly-Used Gains and Resistor Values

DESIRED GAIN

RG (Ω)

NEAREST 1% RG (Ω)

50 k

49.9 k

12.5 k

12.4 k

5.556 k

5.49 k

2.632 k

2.61 k

1.02 k

100

505.1

511

200

251.3

249

500

100.2

100

1000

50.05

49.9

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