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LT1819 Datasheet(PDF) 1 Page - Linear Technology |
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LT1819 Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page LTC6401-20 1 640120f TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION 1.3GHz Low Noise, Low Distortion Differential ADC Driver for 140MHz IF The LTC®6401-20 is a 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 LTC6401-20 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 ca- pacitors in many applications. The gain is internally fixed at 20dB (10V/V). The LTC6401-20 saves space and power compared to alternative solutions using IF gain blocks and transform- ers. The LTC6401-20 is packaged in a compact 16-lead 3mm × 3mm QFN package and operates over the –40°C to 85°C temperature range. ■ 1.3GHz –3dB Bandwidth ■ Fixed Gain of 10V/V (20dB) ■ –93dBc IMD3 at 70MHz (Equivalent OIP3 = 50.5dBm) ■ –74dBc IMD3 at 140MHz (Equivalent OIP3 = 41dBm) ■ 1nV/√⎯H⎯z Internal Op Amp Noise ■ 2.1nV/√⎯H⎯z Total Input Noise ■ 6.2dB Noise Figure ■ Differential Inputs and Outputs ■ 200Ω Input Impedance ■ 2.85V to 3.5V Supply Voltage ■ 50mA Supply Current (150mW) ■ 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 ■ Differential ADC Driver ■ Differential Driver/Receiver ■ Single Ended to Differential Conversion ■ IF Sampling Receivers ■ SAW Filter Interfacing , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. 29 Ω 66.5 Ω 0.1 μF 0.1 μF 640120 TA01a LTC6401-20 VOCM ENABLE LTC2208 10 Ω 0.1 μF + 1000pF INPUT 0.1 μF LTC2208 130Msps 16-Bit ADC 1.25V 3.3V 10 Ω AIN+ AIN– VCM VDD 20dB GAIN V+ –IN +IN 3.3V +OUT +OUTF –OUTF –OUT V– Single-Ended to Differential ADC Driver Equivalent Output IP3 vs Frequency FREQUENCY (MHz) 0 70 (NOTE 7) 60 50 40 30 20 10 0 100 50 150 640120 TA01b 200 |
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