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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

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

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