OPA830 datasheet(31/66 Pages) TI2

31 / 66 page

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, as well as validating and testing 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 8-1.

If VIN = VREF + VSIG, then the output of the amplifier may be calculated according to Equation 1.

SIG

REF

= V

1 +

+ V

OUT

(1)

The signal gain of the circuit is set by

G = 1 +

, 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 8-2.

If VIN = VREF + VSIG, then the output of the amplifier may be calculated according to Equation 2.

SIG

REF

= V

+ V

OUT

(2)

The signal gain of the circuit is set by

G =

, 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 9-1 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.

www.ti.com

OPA836, OPA2836

SLOS712J – JANUARY 2011 – REVISED MARCH 2021

Submit Document Feedback

Product Folder Links: OPA836 OPA2836

OPA830 Datasheet(PDF) 31 Page - Texas Instruments

OPA830 Datasheet(HTML) 31 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66

Datasheet Download

Link URL