Signal Conditioning Operational Amplifiers (Op Amps) Programmable Gain Amplifiers
Signal Conditioning Operational Amplifiers (Op Amps) Differential Amplifiers
High Frequency & Optical IF Amplifiers / ADC Drivers

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

Features

  • 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

Description

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.

Packaging

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

QFN-24

LTC6412 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC6412CUF#PBF QFN 24 C $6.75 $4.69 View
LTC6412CUF#TRPBF QFN 24 C $4.75 View
LTC6412IUF#PBF QFN 24 I $7.43 $5.16 View
LTC6412IUF#TRPBF QFN 24 I $5.22 View
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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 demo boards are offered free of charge to qualified customers. Contact your local sales office or distributor to request 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
DC890_LVDS_XFMR LVDS Power Transformer, goes with DC890B/ LVDS output demoboards Contact Factory
DC890B High Speed (up to 250Mbps, CMOS/LVDS) USB Data Collection Board $300.00
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Click here to view our complete list of demo boards

Applications

  • IF Signal Chain Automatic Gain Control (AGC)
  • 2.5G and 3G Cellular Basestation Transceivers
  • WiMAX, WiBro, WLAN Receivers
  • Satellite and GPS Receiver IF

Simulate

LTspice IV is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. To download LTspice IV and other FREE simulation tools, please visit our Design Simulation page.

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