OPA835 datasheet(11/21 Pages) TI1

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½ OPA2834

Signal and bias to

next stage

2.5 V

GVSIG

2.5 V

VSIG

5 V

VOUT

Signal and bias from

previous stage

2.5 V

REF

5 V

½ O PA283 4

Sign al and bias to

next sta ge

2.5 V

GVSIG

2.5 V

VSIG

5 V

VOUT

Sign al and bias from

previou s stag e

OPA2834

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SBOS973 – JUNE 2019

Product Folder Links: OPA2834

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Device Functional Modes (continued)

Figure 9. Noninverting Single Supply With Resistors

Figure 10 shows a typical inverting-amplifier circuit. With a 5-V single-supply, a mid-supply reference generator is

needed to bias the positive side through R1. To cancel the voltage offset that is otherwise caused by the input

bias currents, R1 is selected to be equal to RF in parallel with RG. For example, if a gain of –2 is required and RF

= 3.6 kΩ, select RG = 1.8 kΩ to set the gain and R1 = 1.2 kΩ for bias current cancellation. The value for C is

dependent on the reference, but TI recommends a value of at least 0.1 µF to limit noise into the op amp.

Figure 10. Inverting Single Supply With Reference

Figure 11 illustrates a similar inverting single-supply scenario with the reference generator replaced by the

Thevenin equivalent using resistors and the positive supply. R1 and R2 form a resistor divider from the 5-V supply

and are used to bias the positive side. To cancel the voltage offset that is otherwise caused by the input bias

currents, set the parallel sum of R1 and R2 equal to the parallel sum of RF and RG. C must be added to limit the

coupling of noise into the positive input. For example, if a gain of –2 is required and RF = 3.6 kΩ, select RG =

1.8 kΩ to set the gain. R1 = R2 = 2.4 kΩ for the mid-supply voltage bias and for op-amp input-bias current

cancellation. A good value for C is 0.1 µF. The resistor divider costs less than the 2.5-V reference in Figure 11

but can increase the current from the 5-V supply.

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