LTC6409 - 10GHz GBW, 1.1nV/√Hz Differential Amplifier/ADC Driver


  • 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

Typical Application

LTC6409 Typical Application
LTC6409 Typical Application


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.


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
LTC6409CUDB#PBF 3x2 QFN-10 UDB C 05-08-1848 Yes
LTC6409CUDB#TRMPBF 3x2 QFN-10 UDB C 05-08-1848 Yes
LTC6409CUDB#TRPBF 3x2 QFN-10 UDB C 05-08-1848 Yes
LTC6409HUDB#PBF 3x2 QFN-10 UDB H 05-08-1848 Yes
LTC6409HUDB#TRMPBF 3x2 QFN-10 UDB H 05-08-1848 Yes
LTC6409HUDB#TRPBF 3x2 QFN-10 UDB H 05-08-1848 Yes
LTC6409IUDB#PBF 3x2 QFN-10 UDB I 05-08-1848 Yes
LTC6409IUDB#TRMPBF 3x2 QFN-10 UDB I 05-08-1848 Yes
LTC6409IUDB#TRPBF 3x2 QFN-10 UDB I 05-08-1848 Yes

LTC6409 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
LTC6409CUDB#PBF 3x2 QFN-10 C $6.34 Yes
LTC6409CUDB#TRMPBF 3x2 QFN-10 C $6.34 $4.55 Yes
LTC6409CUDB#TRPBF 3x2 QFN-10 C $4.50 Yes
LTC6409HUDB#PBF 3x2 QFN-10 H $7.91 Yes
LTC6409HUDB#TRMPBF 3x2 QFN-10 H $7.91 $5.68 Yes
LTC6409HUDB#TRPBF 3x2 QFN-10 H $5.63 Yes
LTC6409IUDB#PBF 3x2 QFN-10 I $6.97 Yes
LTC6409IUDB#TRMPBF 3x2 QFN-10 I $6.97 $5.00 Yes
LTC6409IUDB#TRPBF 3x2 QFN-10 I $4.95 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
DC1591A LTC6409 | 10GHz, 1nV/rt(Hz) Differential Amplifier/ADC Driver $150.00
DC1760A LTC2261-14 + LTC6409 ADC and Driver Combo Board,DC-100MHz, CMOS Outputs, req DC890 and DC1075 $200.00
DC1945A LTC2185 and LTC6409 Combo Board with differential inputs, req DC890, LVDS_XFMR and DC1075 $200.00
DC2266A LTC2107 + LTC6409 Demo Board | 16-Bit, 210Msps ADC and Driver Combo Board, DC-100MHz Input, DDR LVDS Outputs, (req DC1371 and DC2219) $200.00
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Companion Boards

Part Number Description Price Documentation
DC1075A Clock Divider board $50.00
DC890B USB Data Acquisition Controller, for PScope Evaluation Kits (up to 250Mbps, CMOS/LVDS) $300.00
DC1371B FMC High-Speed Data Acquisition Board $1,950.00
DC2219A Single-Ended to Differential Adaptor Board for High-Speed ADC Demoboards $50.00
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Click here to view our complete list of demo boards


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