LTC6421-20 - Dual Matched 1.3GHz Differential Amplifiers/ADC Drivers

The LTC6421-20 is a dual 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 LTC6421-20 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 LTC6421-20 saves space and power compared to alternative solutions using IF gain blocks and transformers. The LTC6421-20 is packaged in a compact 20-lead 3mm × 4mm QFN package and operates over the – 40°C to 85°C temperature range.

Features
  • Matched Gain ±0.1dB
  • Matched Phase ±0.2° at 100MHz
  • Channel Separation 80dB at 100MHz
  • 1.3GHz –3dB Bandwidth; Fixed Gain of 10V/V (20dB)
  • IMD3 = –76dBc at 100MHz, 2VP-P
  • Equivalent OIP3 = 42dBm at 100MHz
  • 1nV/√Hz Internal Op Amp Noise
  • 6.2dB Noise Figure
  • Differential Inputs and Outputs
  • Rail-to-Rail Output Swing
  • 40mA Supply Current (120mW) per Amplifier
  • 1V to 1.6V Output Common Mode Voltage, Adjustable
  • DC- or AC-Coupled Operation
  • 20-Lead 3mm × 4mm × 0.75mm QFN Package
Typical Application
LTC6421-20 Typical Application
LTC6421-20 Typical Application
Applications
  • Differential ADC Driver
  • Single Ended to Differential Conversion
  • IF Sampling (Diversity) Receivers
  • Broadband I/Q Amplifiers
  • Satellite Communications
Packaging
LTC6421-20 Package Drawing
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LTC6421CUDC-20#PBF3x4 QFN-20C$6.88$4.77
LTC6421CUDC-20#TRPBF3x4 QFN-20C$4.82
LTC6421IUDC-20#PBF3x4 QFN-20I$7.92$5.49
LTC6421IUDC-20#TRPBF3x4 QFN-20I$5.54
Demo Boards
Part NumberDescriptionPrice
DC1299A-BLTC6421CUD-20 | Dual Matched 1.3GHz Differential Amplifiers/ADC Drivers$125.00
Datasheet
Reliability Data
Product Selector Card
Press Release
CAD Symbol
Related Products
LTC6421-20 - Dual Matched 1.3GHz Differential Amplifiers/ADC Drivers
LTC6420-20/LTC6421-20 - 1.8GHz/1.3GHz、低失真、双路 ADC 驱动器具有保证的匹配和低噪声
R532 - Reliability Data
High Speed Amplifiers/ADC Drivers
1.8/1.3GHz, Low Distortion, Dual ADC Drivers Deliver Guaranteed Matching & Low Noise
LTC6421-20 Footprints and Symbols