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

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.

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
Applications
  • Differential ADC Driver
  • Differential Driver/Receiver
  • Single Ended to Differential Conversion
  • IF Sampling Receivers
  • SAW Filter Interfacing
Packaging
LTC6400-20 Package Drawing
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LTC6400CUD-20#PBF3x3 QFN-16C$4.57$3.20
LTC6400CUD-20#TRPBF3x3 QFN-16C$3.26
LTC6400IUD-20#PBF3x3 QFN-16I$5.26$3.68
LTC6400IUD-20#TRPBF3x3 QFN-16I$3.74
Demo Boards
Part NumberDescriptionPrice
DC987B-CLTC6400-20 3GHz Fully Differential ADC Driver Demo Circuit$80.00
Datasheet
Application Note
Design Note
Reliability Data
Product Selector Card
LT Journal
Press Release
CAD Symbol
Ad
LTspice
Related Products
LTC6400-20 - 1.8GHz Low Noise, Low Distortion Differential ADC Driver for 300MHz IF
LTC6400-20 - 1GHz 和 2GHz 全差分放大器实现了高速 ADC 性能
AN123 - Application and Optimization of a 2GHz Differential Amplifier/ADC Driver
DN454 - Single-Ended to Differential Amplifier Design Tips
R532 - Reliability Data
High Speed Amplifiers/ADC Drivers
Jun 2007 - SiGe Differential Amplifier Drives High Speed ADCs at Hundreds of MHz
1GHz & 2GHz Fully Differential Amplifiers Enable High-Speed ADC Performance
LTC6400-20 Footprints and Symbols
88dB SFDR @ 100MHz
LTC6400-20 Demo Circuit - Differential Impedance Matching for Fully-Differential Amplifiers
LTC6400-20 Demo Circuit - Noise Simulation for Fully-Differential Amplifiers
LTC6400-20 Demo Circuit - Single-Ended Impedance Matching for Fully Differential Amplifiers