Low-Cost Digitally Programmable Gain Amplifier Reference Design


Design files


This simple and low-cost digitally programmable gain amplifier design creates non-inverting gains ranging from 6dB (2V/V) to 60dB (1000V/V). The design is based on a general purpose op amp and a digital potentiometer as one of the gain-setting elements. The digital potentiometer is controlled with a standard I2C digital interface.

  • Digital Programmed Gain Range:  6dB - 60dB (2V/V - 1000V/V)
  • Controlled with I2C Digital Commands
  • Features Non-Voltatile EEPROM memory
  • Power Supply Voltage ±2.7 V to ±5.5 V
  • Verified reference design includes theory, calculated error analysis, component selection, PCB layout, and measured results
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUB13.PDF (488 K)

Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components

TIDRJ19.PDF (369 K)

Detailed schematic diagram for design layout and components

TIDRJ20.PDF (201 K)

Complete listing of design components, reference designators, and manufacturers/part numbers


Includes TI products in the design and potential alternatives.

General-purpose op amps

OPA316Single, 5.5-V, 10-MHz, 50-mA output current, low noise (11-nV/√Hz), RRIO operational amplifier

Data sheet: PDF | HTML
Digital potentiometers (digipots)

TPL0102-100256-tap dual-channel digital potentiometer with I2C interface and nonvolatile memory

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide Low-Cost Digital Programmable Gain Amplifier Design Guide Nov. 09, 2015

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