Output Differential Voltage (V)

-30

-24

-18

-12

-6

0

6

12

18

24

30

-18

-15

-12

-9

-6

-3

0

3

6

9

12

VS = VSOUT = 15V

VS = VSOUT = 5V

VS = VSOUT = ±15V,

VS = VSOUT = ±5V,

VOCM = 0V

G = 2V/V

Figure 8-3. Input Common-Mode Voltage vs

Output Differential Voltage

Output Differential Voltage (V)

-30

-24

-18

-12

-6

0

6

12

18

24

30

-15

-12

-9

-6

-3

0

3

6

9

12

15

VS =VSOUT= 15V

VS =VSOUT= 5V

VS = VSOUT = ±15V,

VS = VSOUT = ±5V,

VOCM = 0V

G = 100V/V

Figure 8-4. Input Common-Mode Voltage vs

Output Differential Voltage

8.1.2 Current Consumption with Differential Inputs

Programmable gain amplifiers such as the PGA854 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 = 2V/V when applying large amplitude differential signals.

Note that IQvalues in the specifications section are under the condition VIN = 0V. Higher supply current is to be

expected for higher differential input levels. Same goes to bias current IB, which is specified with zero differential

input. Input bias current increases slightly with increased differential inputs up to the linear input range limit (see

Section 8.1.1 for details), If the input exceeds the linear input range limit (inputs are overdriven), the input bias

current significantly increases.

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 PGA854 inputs when the device is overdriven. The dashed vertical

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

when the inputs of the device are overdriven.

VIN, Differential Input Voltage (V)

-30 -25 -20 -15 -10

-5

0

5

10

15

20

25

30

-20

-15

-10

-5

0

5

10

15

20

25

I(Vs+)

I(Vs–)

I(IN+)

I(IN–)

VS = VSOUT = ±15V

VICM = VREF = 0V

G = 0.5V/V

VIN linear limits = ±16V

Figure 8-5. Current Consumption versus

Differential Input Voltage

VIN, Differential Input Voltage (V)

-30 -25 -20 -15 -10

-5

0

5

10

15

20

25

30

-25

-20

-15

-10

-5

0

5

10

15

20

25

I(Vs+)

I(Vs–)

I(IN+)

I(IN–)

VS = VSOUT = ±15V

VICM = VREF = 0V

G = 1V/V

VIN linear limits = ±16V

Figure 8-6. Current Consumption versus

Differential Input Voltage

PGA854

SBOSAN2A – AUGUST 2025 – REVISED DECEMBER 2025

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