1. Products
  2. Amplifiers
  3. Differential Amplifiers and ADC Drivers
  4. Fully Differential Amplifiers
  5. LTC6420-20


Features and Benefits

  • Matched Gain ±0.1dB
  • Matched Phase ±0.1° at 100MHz
  • Channel Separation 80dB at 100MHz
  • 1.8GHz –3dB Bandwidth; Fixed Gain of 10V/V (20dB)
  • IMD3 = –84dBc at 100MHz, 2VP-P
  • Equivalent OIP3 = 46dBm at 100MHz
  • 1nV/√Hz Internal Op Amp Noise
  • 6.2dB Noise Figure
  • Differential Inputs and Outputs
  • Rail-to-Rail Output Swing
  • 80mA Supply Current (240mW) per Amplifier
  • 1.1V to 1.6V Output Common Mode Voltage, Adjustable
  • DC- or AC-Coupled Operation
  • 20-Lead 3mm × 4mm × 0.75mm QFN Package

Product Details

The LTC6420-20 is a dual high-speed differential amplifier targeted at processing signals from DC to 300MHz. 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 LTC6420-20 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 20dB (10V/V).

The LTC6420-20 saves space and power compared to alternative solutions using IF gain blocks and transformers. The LTC6420-20 is packaged in a compact 20-lead 3mm × 4mm QFN package and operates over the –40°C to 85°C temperature range.


  • Differential ADC Driver
  • Single Ended to Differential Conversion
  • IF Sampling (Diversity) Receivers
  • Broadband I/Q Amplifiers
  • Satellite Communications

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits (1)

Tools & Simulations


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.

Design Tools


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.

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
LTC6420CUDC-20#PBF Material Declaration Reliability Data 20-Lead QFN (3mm x 4mm x 0.75mm w/ EP)
LTC6420CUDC-20#TRPBF Material Declaration Reliability Data 20-Lead QFN (3mm x 4mm x 0.75mm w/ EP)
LTC6420IUDC-20#PBF Material Declaration Reliability Data 20-Lead QFN (3mm x 4mm x 0.75mm w/ EP)
LTC6420IUDC-20#TRPBF Material Declaration Reliability Data 20-Lead QFN (3mm x 4mm x 0.75mm w/ EP)
Wafer Fabrication Data R532 Reliability Data

Sample & Buy

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Evaluation Boards

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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.