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

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

QFN-24

Order Info

• Part numbers ending in PBF are lead free. Please contact LTC marketing for information on lead based finish parts.
• 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	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.

Applications

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

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To simulate selected Linear Technology products, please download LTSpice / SwitcherCAD III. This powerful schematic capture and simulation tool includes macro models for 80% of Linear Technology's switching regulators, over 200 op amp models, as well as resistors, transistors and MOSFET models.

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