OPA830 datasheet(28/63 Pages) TI2

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OPA 835

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 = 2 kΩ, select RG =

1 kΩ to set the gain. R1 = R2 = 667 Ω for 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 8-10 but may

increase the current from the 5-V supply.

OPA 835

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

OPA835, OPA2835

SLOS713J – JANUARY 2011 – REVISED MARCH 2021

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OPA830 Datasheet(PDF) 28 Page - Texas Instruments