SBOSA75B July 2021 – November 2021 INA823
Figure 8-2 shows that the gain of the INA823 is set by a single external resistor (RG) connected between the RG pins (pins 1 and 8).
The gain of the INA823 can be calculated with Equation 1:
The value of the external gain resistor RG is then derived from the gain equation:
Table 8-1 lists several commonly used gains and resistor values. The 100-kΩ term in Equation 1 is a result of the sum of the two internal 50-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 Section 7.5. As shown in Figure 8-2 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.
|DESIRED GAIN||NEAREST 1% RG (Ω)||CALCULATED GAIN ERROR (%)|
|1||Not connected||Not connected|