Analog Devices has announced the LTC6419 (product from Linear Technologies which is now part of ADI), a dual 10 GHz gain bandwidth product differential amplifier with very low input voltage noise density of 1.1 nV / √Hz, delivering outstanding SNR performance for wideband signal amplification. Additionally, the LTC6419 offers low distortion, providing 85 dB spurious-free dynamic range (SFDR) at 100 MHz while driving 2VP-P signals.
Four external resistors set the differential gain of each amplifier, configurable from unity gain with frequency response beyond 1 GHz, to gain of 100 with bandwidth of 100 MHz, and up to a maximum gain of 400 with bandwidth of 30 MHz. At these high frequencies, the LTC6419 offers significantly better channel-to-channel isolation of 95 dB at 100 MHz than other similar class dual amplifiers. Also its wide DC common mode voltage ranges from 0 to 3.5 V at the input, and 0.5 to 3.5 V at the output, which 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 (A/D) converters.
It has a supply voltage range from 2.7 V to 5.25 V. Each amplifier also has a shutdown pin, so each amplifier can be enabled independently, drawing a nominal supply current of 52 mA. When disabled, the supply current reduces to 100 µA per amplifier. It is offered in a small 4 mm x 3 mm x 0.75 mm, 20-lead LQFN plastic package with Two grades on offer: an I grade rated from (- 40°C) to 85°C and an H grade from (- 40°)C to 125°C.
The LTC6419 dual differential amplifier, with its DC coupling, low noise and high bandwidth capabilities, is well suited for 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.
LTC6419 Feature Summary:
- Configurable Gain and Bandwidth: Unity Gain = 1.4 GHz / Gain = 100 at 100 MHz / Gain = 400 at 30 MHz
- 1.1 nV / Hz Input Voltage Noise Density with 40kHz Noise Corner Frequency
- Wide DC Common Mode Voltage Range: Input = 0 V to 3.5 V / Output = 0.5 V to 3.5 V
- Channel Separation 95 dB at 100 MHz
- Industrial and High Temperature Grades Offered: I Grade = ( - 40°C) to 85°C / H Grade = ( - 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-pieces quantities. Both are available immediately in production quantities.
