INA821 datasheet(20/51 Pages) TI2

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8.3 Feature Description

8.3.1 Setting the Gain

Figure 8-1 shows that the gain of the INA819 is set by a single external resistor (RG) connected between the RG

pins (pins 1 and 8).

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

Figure 8-1. Simplified Diagram of the INA819 With Gain and Output Equations

The value of RG is selected according to Equation 1:

50 k

(1)

Table 8-1 lists several commonly used gains and resistor values. The 50-kΩ term in Equation 1 is a result of 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 INA819. As shown in Figure 8-1 and explained in more details in Section 11, 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 8-1. 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

INA819

SBOS959D – DECEMBER 2018 – REVISED APRIL 2022

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