OPA835 datasheet(12/21 Pages) TI1

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SIG

REF

= V

+ V

OUT

G = 1 +

SIG

REF

= V

1 +

+ V

OUT

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

5 V

OPA2834

SBOS973 – JUNE 2019

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Device Functional Modes (continued)

Figure 11. Inverting Single Supply With Resistors

9 Application and Implementation

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 OPA2834 can be used as a noninverting amplifier with a signal input to the noninverting input, VIN+.. Figure 1

shows a basic block diagram of the circuit.

The amplifier output can be calculated according to Equation 1 if VIN = VREF + VSIG.

(1)

The signal gain of the circuit is set by

, and VREF provides a reference around which the input and

output signals swing. Output signals are in-phase with the input signals.

The OPA2834 is designed for the nominal value of RF to be 3.6 kΩ in gains other than +1. This value gives

excellent distortion performance, maximum bandwidth, best flatness, and best pulse response. RF = 3.6 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 document have RF = 3.6 kΩ for all gains other than +1. A gain of +1 is a special case where RF is

shorted and RG is left open.

9.1.2 Inverting Amplifier

The OPA2834 can be used as an inverting amplifier with a signal input to the inverting input, VIN–, through the

gain-setting resistor RG. Figure 2 shows a basic block diagram of the circuit.

The output of the amplifier can be calculated according to Equation 2 if VIN = VREF + VSIG.

(2)

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