LMP7717 datasheet(28/56 Pages) TI

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8 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.

8.1 Application Information

8.1.1 Noninverting Amplifier

The OPA838 can be used as noninverting amplifier with signal input to the noninverting input (VIN+). Figure 7-1

illustrates a basic block diagram of the circuit. VREF is often ground when split supplies are used.

If VIN = VREF + VSIG, and the gain setting resistor (RG) is dc referenced to VREF, use Equation 1 to calculate the

output of the amplifier.

SIG

REF

= V

1 +

+ V

OUT

(1)

The noninverting signal gain (also called the noise gain) of the circuit is set by:

G = 1 +

VREF provides a reference around which the input and output signals swing. Output signals are in-phase with

the input signals within the flat portion of the frequency response. For a high-speed, low-noise device like the

OPA838, the values selected for RF (and the RG for the desired gain) can strongly influence the operation of the

circuit. For the characteristic curves, the noninverting circuit of Figure 8-1 shows the test configuration. Table 8-1

lists the recommended resistor values over gain.

VCC

VEE

VCC

RS 50 Ÿ

Network

Analyzer

VEE

V2 -2.5 V

V1 2.5 V

RT 50 Ÿ

R6 51.1 Ÿ

RLOAD 50 Ÿ

R3 1.96 NŸ

VM1

Æ 2 NŸ ORDG

50 Ÿ

Cable

50 Ÿ

Cable

Å 50 Ÿ VRXUFH

Network

Analyzer

RG 200 Ÿ

RF 1 NŸ

Figure 8-1. Noninverting Characterization Circuit

OPA838

SBOS867D – AUGUST 2017 – REVISED SEPTEMBER 2024

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