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OPA2836 View Datasheet(PDF) - Texas Instruments

Part NameDescriptionManufacturer
OPA2836 Very-Low-Power, Rail-to-Rail Out, Negative Rail In, Voltage-Feedback Operational Amplifiers TI
Texas Instruments TI
OPA2836 Datasheet PDF : 59 Pages
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OPA836, OPA2836
SLOS712I – JANUARY 2011 – REVISED OCTOBER 2016
Device Functional Modes (continued)
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5V
2.5 V
REF
5V
R1
C
OPA 836
RO
VOUT
GVSIG
2.5 V
RG
RF
VSIG
2.5 V
Signal and bias
from previous stage
Signal and bias to
next stage
Figure 62. Inverting Single Supply With Reference
Figure 63 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 62
but may increase the current from the 5-V supply.
5V
5V
R1
RO
R2
OPA 836
C
VOUT
GVSIG
2.5 V
RG
VSIG
2.5 V
RF
Signal and bias to
next stage
Signal and bias
from previous stage
Figure 63. Inverting Single Supply With Resistors
30
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