OPA830 datasheet(30/66 Pages) TI2

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OPA 836

VOUT

Signal and bias to

next stage

Signal and bias

from previous stage

VSIG

GVSIG

5 V

2.5 V

REF

2.5 V

Figure 8-10. Inverting Single Supply With Reference

Figure 8-11 shows 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 would otherwise be 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 coupling of noise into the positive input. For example if gain of –2 is required and RF = 1 kΩ,

select RG = 499 Ω to set the gain. R1 = R2 = 665 Ω for mid-supply voltage bias and for operational amplifier 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 8-10 but may increase the current from the 5-V supply.

OPA 836

Signal and bias to

next stage

Signal and bias

from previous stage

5 V

2.5 V

5 V

VOUT

VSIG

GVSIG

2.5 V

Figure 8-11. Inverting Single Supply With Resistors

OPA836, OPA2836

SLOS712J – JANUARY 2011 – REVISED MARCH 2021

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OPA830 Datasheet(PDF) 30 Page - Texas Instruments