V

1.8

A

3.6

0.5

OUT

V

IN

V

A

V

VSUP+

+

VOUT

RF

VIN

RI

VSUP-

16

TLV314, TLV2314, TLV4314

SBOS754A – MARCH 2016 – REVISED MARCH 2016

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Product Folder Links: TLV314 TLV2314 TLV4314

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Copyright © 2016, Texas Instruments Incorporated

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

The TLV314 device is a low-power, rail-to-rail input and output operational amplifier specifically designed for

portable applications. These devices operate from 1.8 V to 5.5 V, are unity-gain stable, and suitable for a wide

range of general-purpose applications. The class AB output stage is capable of driving

≤ 10-kΩ loads connected

to any point between V+ and ground. The input common-mode voltage range includes both rails, and allows the

TLV314 device to be used in virtually any single-supply application. Rail-to-rail input and output swing

significantly increases dynamic range, especially in low-supply applications, and makes the device ideal for

driving sampling analog-to-digital converters (ADCs).

The TLV314 family of devices features a 3-MHz bandwidth and 1.5-V/

μs slew rate with only 150-μA supply

current per channel, providing good ac performance at very low power consumption. DC applications are also

well served with a very-low input noise voltage of 14 nV/

√Hz at 1 kHz, low-input bias current (0.2 pA), and an

input offset voltage of 0.5 mV (typical).

9.2 Typical Application

A typical application for an operational amplifier is an inverting amplifier, as shown in Figure 15. An inverting

amplifier takes a positive voltage on the input and outputs a signal inverted to the input, making a negative

voltage of the same magnitude. In the same manner, the amplifier also makes negative input voltages positive on

the output. In addition, amplification can be added by selecting the input resistor RI and the feedback resistor RF.

Figure 15. Application Schematic

9.2.1 Design Requirements

The supply voltage must be chosen to be larger than the input voltage range and the desired output range. The

limits of the input common-mode range (VCM) and the output voltage swing to the rails (VO) must also be

considered. For instance, this application scales a signal of ±0.5 V (1 V) to ±1.8 V (3.6 V). Setting the supply at

±2.5 V is sufficient to accommodate this application.

9.2.2 Detailed Design Procedure

Determine the gain required by the inverting amplifier using Equation 1 and Equation 2:

(1)

(2)