Three Types: 0.5V/V, 1V/V, 2V/V
Low Noise and Linearity
Analog Devices is launching new products LTC6363-0.5, LTC6363-1, and LTC6363-2, which add three fixed gain options to the existing ultra-precision, differential LTC6363 amplifier. These three new products are offered with fixed gains of 0.5, 1, and 2V/V to provide flexibility when extending the input across the full ADC range.

The precision resistors integrated in the LTC6363-0.5, LTC6363-1, and LTC6363-2 are designed with overall system performance in mind, maintaining a balance between noise and linearity. Additionally, through factory calibration prior to shipment, a high level of precision has been achieved that would be difficult and costly to accomplish using discrete methods. Initial gain accuracy is at most 45ppm, and can vary by at most 0.5ppm/°C across the full temperature range. The CMRR (Common Mode Rejection Ratio), which is typically limited by discrete resistor matching, exhibits a minimum characteristic of 94dB, which corresponds to 0.002% resistor matching.

Maziar Tavakoli, Linear Products and Solutions Design Manager at ADI, states, "One of the challenges in driving high-performance SAR ADCs is finding a driver with similar power consumption levels while maintaining the noise and linearity performance of that ADC. This is where the strength of the LTC6363 product family lies." He adds, "For example, the LTC2378-20 20-bit SAR ADC consumes 21mW at 1Msps, and the noise and linearity of the LTC6363 product family are so low that they barely impact this ADC's performance, with comparable power consumption of 19mW."

He further states, "Now with the launch of LTC6363-0.5, LTC6363-1, and LTC6363-2, developers can leverage the same ADC driving performance, and additionally utilize the enhanced precision made possible through integrated precision resistors, all within a compact MSOP8 package."

All LTC6363 product family members operate from supply voltages of 2.8V (±1.4V) to 11V (±5.5V) and typically consume a supply current of 1.75mA. The operating temperature range is –40°C to 125°C. The LTC6363 fixed gain product family is offered in a 3mm x 5mm plastic MSOP8 package, while the LTC6363 (without integrated resistors) is provided in a 2mm x 3mm DFN package.