LTC6401-8 - 2.2GHz Low Noise, Low Distortion Differential ADC Driver for DC-140MHz


  • 2.2GHz -3dB Bandwidth
  • Fixed Gain of 2.5V/V (8dB)
  • -92dBc IMD3 at 70MHz (Equivalent OIP3 = 50dBm)
  • -80.5dBc IMD3 at 140MHz (Equivalent OIP3 = 44dBm)
  • 1nV/√Hz Internal Op Amp Noise
  • 12.1dB Noise Figure
  • Differential Inputs and Outputs
  • 400Ω Input Impedance
  • 2.85V to 3.5V Supply Voltage
  • 45mA Supply Current (135mW)
  • 1V to 1.6V Output Common Mode, Adjustable
  • DC- or AC-Coupled Operation
  • Max Differential Output Swing 4.6VP-P
  • Small 16-Lead 3mm x 3mm x 0.75mm QFN Package

Typical Application

LTC6401-8 Typical Application
LTC6401-8 Typical Application


The LTC6401-8 is a high-speed differential amplifier targeted at processing signals from DC to 140MHz. The part has been specifically designed to drive 12-, 14- and 16-bit ADCs with low noise and low distortion, but can also be used as a general-purpose broadband gain block.

The LTC6401-8 is easy to use, with minimal support circuitry required. The output common mode voltage is set using an external pin, independent of the inputs, which eliminates the need for transformers or AC-coupling capacitors in many applications. The gain is internally fixed at 8dB (2.5V/V).

The LTC6401-8 saves space and power compared to alternative solutions using IF gain blocks and transformers. The LTC6401-8 is packaged in a compact 16-lead 3mm x 3mm QFN package and operates over the -40°C to 85°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
LTC6401CUD-8#PBF 3x3 QFN-16 UD C 05-08-1691 Yes
LTC6401CUD-8#TRPBF 3x3 QFN-16 UD C 05-08-1691 Yes
LTC6401IUD-8#PBF 3x3 QFN-16 UD I 05-08-1691 Yes
LTC6401IUD-8#TRPBF 3x3 QFN-16 UD I 05-08-1691 Yes

LTC6401-8 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
LTC6401CUD-8#PBF 3x3 QFN-16 C $4.21 $2.95 Yes
LTC6401CUD-8#TRPBF 3x3 QFN-16 C $3.01 Yes
LTC6401IUD-8#PBF 3x3 QFN-16 I $4.85 $3.40 Yes
LTC6401IUD-8#TRPBF 3x3 QFN-16 I $3.46 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
DC987B-E LTC6401-8 3GHz Fully Differential ADC Driver Demo Circuit $80.00
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Click here to view our complete list of demo boards


  • Differential ADC Driver
  • Differential Driver/Receiver
  • Single Ended to Differential Conversion
  • IF Sampling Receivers
  • SAW Filter Interfacing

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