Dual Differential Amp Exhibits Low Noise, 10 GHz Gain Bandwidth

28 March 2017

LTC6419 dual 10 GHz gain bandwidth product differential amplifier. Source: Linear Technology LTC6419 dual 10 GHz gain bandwidth product differential amplifier. Source: Linear Technology Analog Devices, Inc., which recently acquired Linear Technology Corporation, announces the LTC6419, a dual 10 gigahertz gain bandwidth product differential amplifier, with very low input voltage noise density of 1.1 nanovolts per square root hertz, delivering high signal-to-noise performance for wideband signal amplification.

Additionally, the LTC6419 offers low distortion, providing 85 decibel spurious-free dynamic range (SFDR) at 100 megahertz while driving 2 peak-to-peak voltage signals. Four external resistors set the differential gain of each amplifier, configurable from unity gain with frequency response beyond 1 gigahertz, to gain of 100 with bandwidth of 100 megahertz, and up to a maximum gain of 400 with bandwidth of 30 megahertz. At these high frequencies, the LTC6419 offers significantly better channel-to-channel isolation of 95 decibel at 100 megahertz than other similar class dual amplifiers.

Also, the part’s wide DC common mode voltage ranges, 0 volts to 3.5 volts at the input, and 0.5 volts to 3.5 volts at the output, make the part particularly 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 analog-to-digital converters (ADCs).

The LTC6419 has a supply voltage range from 2.7 to 5.25 volts. Each amplifier also has a shutdown pin, so each amplifier can be enabled independently, drawing a nominal supply current of 52 milliamps. When disabled, the supply current reduces to 100 microamps per amplifier.

With its DC coupling, low noise and high bandwidth capabilities, the LTC6419 dual differential amplifier suits many applications, such as 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 is offered in a small 4 millimeter-by-3 millimeter-by-0.75 millimeter, 20-lead LQFN plastic package. Two grades are offered: an I grade rated from negative 40 C to 85 C and an H grade from negative 40 C to 125 C. The LTC6419 I grade is priced starting at $8.50, and the H grade starting at $9.90 each in 1,000-piece quantities. Both are available immediately in production quantities.

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