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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

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

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