RF & Wireless IF Amplifiers / ADC Drivers
Signal Conditioning Operational Amplifiers (Op Amps) High Speed Amplifiers (GBW > 50MHz)
 Signal Conditioning Operational Amplifiers (Op Amps) Differential Output Amplifiers

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

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

Description

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.

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
LTC6421CUDC-20#PBF 3x4 QFN-20 UDC C 05-08-1742 Yes
LTC6421CUDC-20#TRPBF 3x4 QFN-20 UDC C 05-08-1742 Yes
LTC6421IUDC-20#PBF 3x4 QFN-20 UDC I 05-08-1742 Yes
LTC6421IUDC-20#TRPBF 3x4 QFN-20 UDC I 05-08-1742 Yes


LTC6421-20 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
LTC6421CUDC-20#PBF 3x4 QFN-20 C $6.88 $4.77 Yes
LTC6421CUDC-20#TRPBF 3x4 QFN-20 C $4.82 Yes
LTC6421IUDC-20#PBF 3x4 QFN-20 I $7.92 $5.49 Yes
LTC6421IUDC-20#TRPBF 3x4 QFN-20 I $5.54 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
DC1299A-B LTC6421CUD-20 | Dual Matched 1.3GHz Differential Amplifiers/ADC Drivers $125.00
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Click here to view our complete list of demo boards

Applications

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

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