Dual differential amplifier has SNR for wideband signal amplification

A dual 10GHz gain bandwidth differential amplifier has been announced by Analog Devices. The LTC6419 has a low input voltage noise density of 1.1nV/√Hz, and delivers signal noise ratio (SNR) performance for wideband signal amplification.

The LTC6419 offers low distortion and provides 85dB spurious-free dynamic range (SFDR) at 100MHz while driving 2VP-P signals. Four external resistors set the differential gain of each amplifier, configurable from unity gain with frequency response beyond 1GHz, to gain of 100 with bandwidth of 100MHz, and up to a maximum gain of 400 with bandwidth of 30MHz. At these high frequencies, the LTC6419 offers significantly better channel-to-channel isolation of 95dB at 100MHz than other similar class dual amplifiers. The wide DC common mode voltage ranges, 0 to 3.5V at the input, and 0.5V to 3.5V at the output, make the part useful in DC coupled applications interfacing between two dissimilar DC levels, such as from the outputs of an I/Q demodulator to the inputs of analogue to digital converters (ADCs).

The LTC6419 dual differential amplifier has DC coupling, low noise and high bandwidth capabilities, making it suitable for direct conversion receivers, driving high sample rate ADCs, high speed data acquisition systems, test instrumentation, high resolution radar systems, advanced image sensors and LIDAR systems.

The LTC6419 has a supply voltage range from 2.7 to 5.25V. Each amplifier also has a shutdown pin, allowing it to be enabled independently, drawing a nominal supply current of 52mA. When disabled, the supply current reduces to 100microA per amplifier.

The LTC6419 is offered in a small 4.0 x 3.0 x 0.75mm, 20-lead LQFN plastic package. Two grades are offered. There is the I grade, rated from   ̶ 40 to +85 degree C and an H grade from  ̶ 40 to +125 degree C.

On March 10 2017, Analog Devices acquired Linear Technology.



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