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Analog Devices has released the LTC6363-0.5, LTC6363-1 and LTC6363-2 Precision, Fixed-Gain, Fully Differential Amplifiers, creating a family of ultra-precision fixed-gain variants of the successful LTC6363 amplifier. The new offerings are available in fixed gains of 0.5, 1 and 2V/V which provide flexibility when scaling inputs to the full range of ADCs. The 3 new parts join the LTC6363 device which is a standalone differential amplifier, where the gain is typically set using four external resistors.

The precision resistors, which are integrated in LTC6363-0.5, LTC6363-1 and LTC6363-2, have been designed with overall system performance in mind, striking a balance between noise and linearity, and utilizing laser trimmed factory calibration to achieve a level of precision which is difficult and costly to achieve discretely. Initial gain accuracy is 45ppm maximum and varies by only 0.5ppm/°C maximum over temperature. Common mode rejection ratio, which is typically limited by discrete resistor matching, is an outstanding 94dB minimum, equivalent to a 0.002% resistor matching.

“One of the challenges when driving high performance SAR ADCs is finding an appropriate driver that consumes comparable power while maintaining the noise and linearity performance of the ADC. This is where the LTC6363 family excels. For example, the LTC2378-20 20-bit SAR ADC consumes 21mW at 1Msps,” says Maziar Tavakoli, Design Manager, Linear Products and Solutions. “The LTC6363 family’s noise and linearity have negligible impact on ADC performance while consuming a mere 19mW, comparable to the ADC’s power consumption. Now with the LTC6363-0.5, LTC6363-1 and LTC6363-2 you can get this same ADC driving performance plus the added precision afforded by the precision integrated resistors, all in the same compact MSOP8 package.”

Click below to view a video on driving high resolution SAR ADCs using the LTC6363

The entire LTC6363 family operates with supply voltages from 2.8V (±1.4V) to 11V (±5.5V) while drawing 1.75mA typical supply current. The devices are specified for operation over a temperature range from –40°C to 125°C. The LTC6363 fixed-gain series are available in a 3mm × 5mm plastic MSOP8 package, and the LTC6363(without resistors) is also offered in the tiny 2mm × 3mm DFN package.

The LTC6363 family is supported by the DC2319A demonstration board which features the LTC6363 device where the gain can be set using external resistors.
The DC2319A demo board allows users to configure the amplifier to process a fully differential input signal or to convert a single-ended input signal to a differential output signal. The differential outputs of the DC2319A can be configured with a first order RC network for driving the differential inputs of an ADC. The DC2319A demo board can be DC-coupled or AC-coupled. On-board jumpers configure the DC2319A for dual or single power supply. In addition, there are multiple optional surface-mount pads that can be used to change the LTC6363 configuration.

Anglia are offering customers a FREE evaluation board and samples of the LTC6363 Family of Precision Fully Differential Amplifiers from Analog Devices, please fill in the form below to register your interest now.