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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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9 Application and Implementation
OPA836, OPA2836
SLOS712I – JANUARY 2011 – REVISED OCTOBER 2016
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
9.1.1 Noninverting Amplifier
The OPA836 and OPA2836 devices can be used as noninverting amplifiers with signal input to the noninverting
input, VIN+ . A basic block diagram of the circuit is shown in Figure 53.
If VIN = VREF + VSIG, then the output of the amplifier may be calculated according to Equation 1.
æ
VOUT
=
VSIG
ç1
è
+
RF
RG
ö
÷
ø
+ VREF
(1)
G = 1 + RF
The signal gain of the circuit is set by
RG , and VREF provides a reference around which the input and
output signals swing. Output signals are in-phase with the input signals.
The OPA836 and OPA2836 devices are designed for the nominal value of RF to be 1 kΩ in gains other than +1.
This gives excellent distortion performance, maximum bandwidth, best flatness, and best pulse response. RF = 1
kΩ must be used as a default unless other design goals require changing to other values. All test circuits used to
collect data for this data sheet had RF = 1 kΩ for all gains other than +1. Gain of +1 is a special case where RF is
shorted and RG is left open.
9.1.2 Inverting Amplifier
The OPA836 and OPA2836 devices can be used as inverting amplifiers with signal input to the inverting input,
VIN– , through the gain setting resistor RG. A basic block diagram of the circuit is shown in Figure 54.
If VIN = VREF + VSIG, then the output of the amplifier may be calculated according to Equation 2.
VOUT
=
VSIG
æ
ç
è
-RF
RG
ö
÷ + VREF
ø
(2)
G = -RF
The signal gain of the circuit is set by
RG , and VREF provides a reference point around which the input
and output signals swing. Output signals are 180° out-of-phase with the input signals. The nominal value of RF
must be 1 kΩ for inverting gains.
9.1.3 Instrumentation Amplifier
Figure 64 is an instrumentation amplifier that combines the high input impedance of the differential-to-differential
amplifier circuit and the common-mode rejection of the differential-to-single-ended amplifier circuit. This circuit is
often used in applications where high input impedance is required (such as taps from a differential line) or in
cases where the signal source has a high output impedance.
If VIN+ = VCM + VSIG+ and VIN– = VCM + VSIG– , then the output of the amplifier may be calculated according to
Equation 3.
VOUT =
(VIN+ - VIN- )
´
æ
ç1
è
+
2RF1
ö
÷
RG1 ø
æ
ç
è
RF2
RG2
ö
÷+
ø
VREF
(3)
Copyright © 2011–2016, Texas Instruments Incorporated
Product Folder Links: OPA836 OPA2836
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