INA821 datasheet(24/40 Pages) TI

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VREF = 0V

G = 16V/V

Figure 8-3. Input Common-Mode Voltage vs Output

Voltage

VS = ±15V

VSOUT = 5V

VREF = 2.5V

Figure 8-4. Input Common-Mode Voltage vs Output

Voltage

8.1.2 Current Consumption with Differential Inputs

Programmable gain amplifiers such as the PGA849 use internal resistors to set the gain. Consequently, the

current consumption is increased by the current that passes through these resistors. The largest supply current

consumption occurs at G = 1V/V when applying large amplitude differential signals.

Figure 8-5 to Figure 8-8 show typical current consumption versus input differential voltage for the input stage

supply, and the current drawn by the PGA849 inputs when the device is overdriven. The dashed vertical

reference lines outline the linear operating region of the device at that given gain (VINDIFF), outside of this

region is when the inputs of the device are overdriven.

VS = VSOUT = ±15V

VICM = VREF = 0V

VINDIFF = ±24.1V

G = 0.125V/V

Figure 8-5. Current Consumption versus

Differential Input Voltage

VS = VSOUT = ±15V

VICM = VREF = 0V

VINDIFF = ±14.5V

G = 1V/V

Figure 8-6. Current Consumption versus

Differential Input Voltage

PGA849

SBOSAG3A – MARCH 2024 – REVISED DECEMBER 2024

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