TPL0102 datasheet(28/48 Pages) TI2

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Gain

= +

NŸ

Vcc

TPL0102

OPA316

100 K

33 pF

100

TPL0102

SLIS134C – MARCH 2011 – REVISED SEPTEMBER 2015

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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. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

There are many applications in which variable resistance or voltage division is needed through the use of a

digital potentiometer such as the TPL0102; these are just a few examples. In conjunction with various amplifiers,

the TPL0102 can effectively be used in rheostat mode to modify the gain of an amplifier, in voltage divider mode

to create a Digital to Analog Converter, or one of the potentiometers can be used in voltage divider mode while

the other is in rheostat mode to create a variable current sink.

8.2 Typical Applications

8.2.1 Adjustable Gain Non-Inverting Amplifier

Figure 31. Gain Control Compensation Schematic

8.2.1.1 Design Requirements

DESIGN PARAMETER

EXAMPLE VALUE

Gain range

6 to 60 dB

8.2.1.2 Detailed Design Procedure

The TPL0102 can be used in rheostat mode with an OPA316 to create an adjustable gain non-inverting amplifier.

The capacitor and resistor values were chosen based upon the Non-Inverting Amplifier Gain equation:

(5)

Where Zin is the impedance between the inverting input and GND and Zf is the impedance of the feedback

network.

TPL0102 Datasheet(PDF) 28 Page - Texas Instruments