The amplifier offers low distortion, providing 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 improved channel-to-channel isolation of 95dB at 100MHz than other similar class dual amplifiers. Because of its wide DC common mode voltage ranges, 0V to 3.5V at the input, and 0.5V to 3.5V at the output, it is also 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 analogue-to-digital (A/D) converters.
This amplifier, with its DC coupling, low noise and high bandwidth capabilities, is suitable for a variety of different 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 has a supply voltage range from 2.7V to 5.25V. Each amplifier also has a shutdown pin, so each amplifier can be enabled independently, drawing a nominal supply current of 52mA. When disabled, the supply current reduces to 100μA per amplifier.
The LTC6419 comes in a small 4mm x 3mm x 0.75mm, 20-lead LQFN plastic package. Two grades are offered: an I grade rated from –40°C to 85°C and an H grade from –40°C to 125°C.
