LTC6400-20 - 1.8GHz Low Noise, Low Distortion Differential ADC Driver for 300MHz IF

Features

  • 1.8GHz –3dB Bandwidth
  • Fixed Gain of 10V/V (20dB)
  • –94dBc IMD3 at 70MHz (Equivalent OIP3 = 51dBm)
  • –65dBc IMD3 at 300MHz (Equivalent OIP3 = 36.5dBm)
  • 1nV/rHz Internal Op Amp Noise
  • 2.1nV/rHz Total Input Noise
  • 6.2dB Noise Figure
  • Differential Inputs and Outputs
  • 200ohm Input Impedance
  • 2.85V to 3.5V Supply Voltage
  • 90mA Supply Current (270mW)
  • 1V to 1.6V Output Common Mode Voltage, Adjustable
  • DC- or AC-Coupled Operation
  • Max Differential Output Swing 4.4VP-P
  • Small 16-Lead 3mm × 3mm × 0.75mm QFN Package

Typical Application

LTC6400-20 Typical Application
LTC6400-20 Typical Application

Description

The LTC6400-20 is a 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 LTC6400-20 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 LTC6400-20 saves space and power compared to alternative solutions using IF gain blocks and transformers. The LTC6400-20 is packaged in a compact 16-lead 3mm x 3mm QFN package and operates over the –40°C to 85°C temperature range.

Packaging

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
Drawing
RoHS
LTC6400CUD-20#PBF 3x3 QFN-16 UD C 05-08-1691 Yes
LTC6400CUD-20#TRPBF 3x3 QFN-16 UD C 05-08-1691 Yes
LTC6400IUD-20#PBF 3x3 QFN-16 UD I 05-08-1691 Yes
LTC6400IUD-20#TRPBF 3x3 QFN-16 UD I 05-08-1691 Yes


LTC6400-20 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
(1-99)
Price
(1k)*
RoHS
LTC6400CUD-20#PBF 3x3 QFN-16 C $4.57 $3.20 Yes
LTC6400CUD-20#TRPBF 3x3 QFN-16 C $3.26 Yes
LTC6400IUD-20#PBF 3x3 QFN-16 I $5.26 $3.68 Yes
LTC6400IUD-20#TRPBF 3x3 QFN-16 I $3.74 Yes
Buy NowRequest Samples
* 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-C LTC6400-20 3GHz Fully Differential ADC Driver Demo Circuit $80.00
Buy Now
Click here to view our complete list of demo boards

Applications

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

Product Notifications

Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.

Forgot your password? Click here.
Need help? Email mylinear@linear.com with questions and comments.

Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

To launch a ready to run LTspice demonstration circuit for this part:

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Models for the following parts are available in LTspice:
LTC6400-14
LTC6400-20
LTC6400-26
LTC6400-8

Technical Support