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LTC6409

RECOMMENDED FOR NEW DESIGNS

10GHz GBW, 1.1nV/√Hz Differential Amplifier/ADC Driver

Data Sheet Product Selection Table
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Overview

  • 10GHz Gain-Bandwidth Product
  • 88dB SFDR at 100MHz, 2VP-P
  • 1.1nV/√Hz Input Noise Density
  • Input Range Includes Ground
  • External Resistors Set Gain (Min 1V/V)
  • 3300V/μs Differential Slew Rate
  • 52mA Supply Current
  • 2.7V to 5.25V Supply Voltage Range
  • Fully Differential Input and Output
  • Adjustable Output Common Mode Voltage
  • Low Power Shutdown
  • Small 10-Lead 3mm × 2mm × 0.75mm QFN Package

The LTC6409 is a very high speed, low distortion, differential amplifier. Its input common mode range includes ground, so that a ground-referenced input signal can be DC-coupled, level-shifted, and converted to drive an ADC differentially.

The gain and feedback resistors are external, so that the exact gain and frequency response can be tailored to each application. For example, the amplifier could be externally compensated in a no-overshoot configuration, which is desired in certain time-domain applications.

The LTC6409 is stable in a differential gain of 1. This allows for a low output noise in applications where gain is not desired. It draws 52mA of supply current and has a hardware shutdown feature which reduces current consumption to 100μA.

The LTC6409 is available in a compact 3mm × 2mm 10‑pin leadless QFN package and operates over a –40°C to 125°C temperature range.

Applications

  • Differential Pipeline ADC Driver
  • High-Speed Data-Acquisition Cards
  • Automated Test Equipment
  • Time Domain Reflectometry
  • Communications Receivers

 
LTC6409
10GHz GBW, 1.1nV/√Hz Differential Amplifier/ADC Driver
DC-Coupled Interface from a Ground-Referenced Single-Ended Input to an LTC2262-14 ADC LTC6409 Driving LTC2262-14 ADC, fIN = 70MHz, –1dBFS, fS = 150MHz, 4096-Point FFT Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 4

Technical Articles 3

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Analog to Digital Converters (ADCs) 1
LTC2262-14
PRODUCTION 14-Bit, 150Msps Ultralow Power 1.8V ADC
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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC6409

ADI DiffAmpCalc™

ADI's new ADI DiffAmpCalc™ is a free, downloadable calculator for designing differential amplifier circuits. The tool is easy to use and features an interactive user interface to quickly get you up and running.

Open Tool

ADIsimRF

ADIsimRF is an easy-to-use RF signal chain calculator. Cascaded gain, noise, distortion and power consumption can be calculated, plotted and exported for signal chains with up to 50 stages. ADIsimRF also includes an extensive data base of device models for ADI’s RF and mixed signal components.

Open Tool

Signal Chain Designer

Signal Chain Designer is a web-based tool designed to create and simulate complex precision signal chains. See your circuit’s performance before you commit to your PCB: transfer function, noise, power consumption, input range, and DC error. Quickly experiment with different parts and architectures. Signal chains can be exported to LTspice for further analysis.

Open Tool

Sys-Parameter Models for Keysight Genesys

Sys-Parameter models contain behavioral parameters, such as P1dB, IP3, gain, noise figure and return loss, which describe nonlinear and linear characteristics of a device.

Open Tool
LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

eval board
schematic 1
schematic 2
schematic 3
schematic 4
schematic 5
DC1945A

LTC2185 and LTC6409 Combo Board with differential inputs, requires DC890, LVDS_XFMR and DC1075

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Product Details

DC1945A: Demo Board for the LTC2185 - 16-Bit, 125Msps Low Power Dual ADCs and LTC6409 - 10GHz GBW, 1.1nV/√Hz Differential Amplifier/ADC Driver.


 


eval board
schematic 6
DC1760A

LTC2261-14 + LTC6409 ADC and Driver Combo Board,DC-100MHz, CMOS Outputs, requires DC890 and DC1075

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Product Details

DC1760A Demo Board for:
LTC2261-14 14-Bit, 125Msps Ultra-Low Power 1.8V ADCs
LTC6409 10GHz GBW, 1.1nV/√Hz Differential Amplifier/ADC Driver


 


eval board
schematic 7
schematic 8
schematic 9
schematic 10
schematic 11
DC1591A

LTC6409 | 10GHz, 1nV/√(Hz) Differential Amplifier/ADC Driver

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Product Details

DC1591A: Demo Board for the LTC6409 10GHz GBW, 1.1nV/√Hz Differential Amplifier/ADC Driver.

eval board
schematic 12
DC2266A

LTC2107 and LTC6409 Demo Board | 16-Bit, 210Msps ADC and Driver Combo Board, DC-100MHz Input, DDR LVDS Outputs, (Requires DC1371 and DC2219)

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Product Details

Demonstration circuit 2266A features the LTC2107, 210Msps ADC, and the LTC6409 low noise amplifier. DC2266A supports the LTC2107 DDR LVDS output mode.


The circuitry on the analog inputs is optimized for analog input frequencies from DC to 100MHz. When driven with a 50Ω source, the gain will be 6dB. To modify the input for other input ranges or gains refer to the LTC6409 data sheet.
DC1945A
LTC2185 and LTC6409 Combo Board with differential inputs, requires DC890, LVDS_XFMR and DC1075
DC1945A Demo Board DC1945A Demo Board DC1945A Demo Board DC1945A Demo Board DC1945A - Schematic
DC1760A
LTC2261-14 + LTC6409 ADC and Driver Combo Board,DC-100MHz, CMOS Outputs, requires DC890 and DC1075
DC1760A - Schematic
DC1591A
LTC6409 | 10GHz, 1nV/√(Hz) Differential Amplifier/ADC Driver
DC1591A Demo Board DC1591A Demo Board DC1591A Demo Board DC1591A Demo Board DC1591A - Schematic
DC2266A
LTC2107 and LTC6409 Demo Board | 16-Bit, 210Msps ADC and Driver Combo Board, DC-100MHz Input, DDR LVDS Outputs, (Requires DC1371 and DC2219)
DC2266A - Schematic

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