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

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.

  • 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
  • IF Signal Chain Automatic Gain Control (AGC)
  • 2.5G and 3G Cellular Basestation Transceivers
  • WiMAX, WiBro, WLAN Receivers
  • Satellite and GPS Receiver IF
LTC6412 Package Drawing
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LTC6412CUF#PBF4x4 QFN-24C$6.75$4.69
LTC6412CUF#TRPBF4x4 QFN-24C$4.75
LTC6412IUF#PBF4x4 QFN-24I$7.43$5.16
LTC6412IUF#TRPBF4x4 QFN-24I$5.22
Demo Boards
Part NumberDescriptionPrice
DC1464ALTC6412 l 800 MHz, 31dB Range Analog-Controlled VGA$100.00
DC1600ALTC6412, LTC2261-14 | 10MHz to 800MHz, 31dB Range Analog Controlled VGA$200.00
Companion Boards
Part NumberDescriptionPrice
DC890BUSB Data Acquisition Controller, for PScope Evaluation Kits (up to 250Mbps, CMOS/LVDS)$300.00
Design Note
Reliability Data
Product Selector Card
LT Journal
Press Release
CAD Symbol
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LTC6412 Footprints and Symbols