May 3, 2012 – Linear Technology Korea (CEO Hong Sa-kwak) announced the development of a low-power fully differential amplifier (product name: LTC6362) capable of driving high-precision 16- and 18-bit SAR ADCs even at a supply current of 1mA. Featuring a maximum input offset voltage of 200μV and input-referred noise of 3.9nV/√Hz, this product is suitable for precision industrial and data acquisition applications.
The LTC6362 is ideal for driving ADCs such as the LTC2379-18 in multiplexed input and control loop applications, featuring an 18-bit settling time of 550ns along with output common-mode pins ranging from 0.5V to 4.5V and 8VP-P output stages. This 18-bit SAR ADC features digital gain compression, allowing a full-scale input range of 10 to 90% of the reference voltage to be set. Combined with the LTC6362's rail-to-rail output stages, this feature simplifies the circuit and minimizes power consumption by eliminating the need for a negative supply rail.
This flexible architecture of the LTC6362 can convert single-ended DC coupled, ground-referenced signals into differential or DC level-shifted differential input signals. The LTC6362 also enables use in high-impedance configurations through features such as low input bias current, low offset voltage, and rail-to-rail input, allowing it to connect directly to sensors early in the signal chain.
The LTC6362 is available in MSOP-8 and 3mm x 3mm DFN packages and is guaranteed to perform over temperature ranges of 0°C to 70°C, -40°C to 85°C, and -40°C to 125°C. The product is priced at $1.59 per unit based on a quantity of 1,000. For detailed product information, please refer to www.linear.com/product/LTC6362 .

Image caption: 1mA IS precision ADC driver

LTC6362 Product Features

• 1mA supply current
• Single 2.8V ~ 5.25V supply
• 200μV maximum offset voltage
• 260nA maximum input bias current
• Fast Settling: 550ns ~ 18-bit, 8VP-P Output
• Rail-to-rail input and output
• 3.9 nV/√ Hz input reference noise
• 8-pin MSOP, 8-pin 3mm x 3mm DFN package