Analog Devices Inc. AD8338 18MHz Variable Gain Amplifier

Analog Devices Inc. AD8338 18MHz Variable Gain Amplifier is designed for applications that require a fully differential signal path, low power, low noise, and a well-defined gain over frequencies from LF to 18MHz. The device can also operate using single-ended sources if required. The basic gain function is linear-in-dB with a nominal gain range of 0dB to 80dB; the nominal gain range corresponds to a control voltage on the GAIN pin of 0.1V to 1.1V. The gain range can be adjusted up or down via direct access to the internal summing nodes at the INPD and INMD pins. ADI AD8338 includes additional circuits to enable offset correction and automatic gain control. This ADI VGA is ideal for use in a variety of applications, including front end for inductive telemetry systems.


  • 3mA supply current at gain of 40dB
  • Low frequency (LF) to 18MHz operation
  • 3.0V to 5.0V Supply range
  • Adjustable gain range
  • Low noise:
    • 4.5nV/√Hz
    • 1.5nV/√Hz with 50√Hz input resistors
  • Fully differential signal path
  • Offset correction (offset null) feature
  • Adjustable bandwidth
  • Internal 1.5V reference
  • 16-lead LFCSP
  • Automatic gain control feature
  • Wide gain range for high dynamic range signals


  • Front end for inductive telemetry systems
  • Ultrasonic signal receivers
  • RF baseband signal conditioning
  • Portable and hand held instrumentation
  • Low power PGA, VGA or AGC applications

Additional Resources

Design a Powerful Signal Generator Output Stage

How to design a small and inexpensive output stage with a voltage gain amplifier (VGA) and a current feedback amplifier (CFA).

Learn More

Block Diagram

Block Diagram - Analog Devices Inc. AD8338 18MHz Variable Gain Amplifier
Published: 2013-06-28 | Updated: 2022-03-11