LTC6412 - 800MHz, 31dB Range Analog-Controlled VGA


  • 800MHz –3dB Small-Signal Bandwidth
  • Continuously-Adjustable Gain Control
  • –14dB to +17dB Linear-in-dB Gain Range
  • 35dBm OIP3 at 240MHz Across All Gain Settings
  • 10dB Noise Figure at Maximum Gain
  • (IIP3 – NF) = +8dBm at 240MHz Across All Gains
  • 2.7nV/√Hz Input Referred Noise
  • Differential Inputs and Outputs
  • 50Ω Input Impedance Across all Gains
  • Single Supply Operation from 3V to 3.6V
  • 110mA Supply Current
  • 4mm × 4mm × 0.75mm 24-Pin QFN Package

Typical Application

LTC6412 Typical Application
LTC6412 Typical Application


The LTC6412 is a fully differential variable gain amplifier with linear-in-dB analog gain control. It is designed for AC-coupled operation in IF receiver chains from 1MHz to 500MHz. The part has a constant OIP3 across a wide output amplitude range and across the 31dB gain control range. The output noise (NF + Gain) is also fl at versus gain to provide a uniform spurious-free dynamic range (SFDR) >120dB over the full gain control range at 240MHz.

The LTC6412 is ideal for interfacing with the LT®5527 and LT5557 downconverting mixers, LTC6410-6 IF amplifier and the LTC6400/LTC6401/LTC6416 ADC drivers for use in 12-, 14-, and 16-bit ADC applications.

The LTC6412 recovers quickly from an overdrive condition, and the EN pin allows for a fast output signal disable to protect sensitive downstream components. Asserting the SHDN pin reduces the current consumption below 1mA for power-down or sleep modes.


CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
LTC6412CUF#PBF 4x4 QFN-24 UF C 05-08-1697 Yes
LTC6412CUF#TRPBF 4x4 QFN-24 UF C 05-08-1697 Yes
LTC6412IUF#PBF 4x4 QFN-24 UF I 05-08-1697 Yes
LTC6412IUF#TRPBF 4x4 QFN-24 UF I 05-08-1697 Yes

LTC6412 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
LTC6412CUF#PBF 4x4 QFN-24 C $6.75 $4.69 Yes
LTC6412CUF#TRPBF 4x4 QFN-24 C $4.75 Yes
LTC6412IUF#PBF 4x4 QFN-24 I $7.43 $5.16 Yes
LTC6412IUF#TRPBF 4x4 QFN-24 I $5.22 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC1464A LTC6412 l 800 MHz, 31dB Range Analog-Controlled VGA $100.00
DC1600A LTC6412, LTC2261-14 | 10MHz to 800MHz, 31dB Range Analog Controlled VGA $200.00
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Companion Boards

Part Number Description Price Documentation
DC890B USB Data Acquisition Controller, for PScope Evaluation Kits (up to 250Mbps, CMOS/LVDS) $300.00
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Click here to view our complete list of demo boards


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Linear Technology provides a variety of custom design simulation tools and device models to allow even novice designers to quickly and easily evaluate circuits using high performance switching regulators, amplifiers, data converters, filters and more. Please visit our Design Tools page to view and download:

  • LTspice - A powerful SPICE simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators
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