AD8244BRMZ-R7

AD8244BRMZ-R7 is a precision, low power, FET input, quad unity-gain buffer that is designed to isolate very large source impedances from the rest of the signal chain. The 2pA maximum bias current, near-zero current noise, and 10 Tohm input impedance introduce almost no error, even with source impedance well into the megaohms. The AD8244 solves this problem with a unique pinout that physically separates the high-impedance inputs from the low-impedance supplies and outputs of the other buffers. This configuration simplifies guarding while reducing board space, allowing high performance and high density in the same design. The AD8244 design is focused on solving problems specific to buffers. This includes close channel-to-channel matching which allows channels of the AD8244 to be used in differential signal chains with minimal error. Typical applications are biopotential electrodes, medical instrumentation, high-impedance sensor conditioning, filters, and photodiode amplifiers.

• Low power, FET input, extremely high input impedance
• Low noise, high dc precision, unique pinout
• No leakage from inputs to supply pins, provides guarding capability
• Rail-to-rail output, single-supply operation, input range extends to the ground
• Offset voltage is 100µV typ at +VS=5V, –VS=0V, TA=25°C, VIN=0.2V, RL=10Kohm
• Input bias current is 0.5pA typ at +VS=5V, –VS=0V, TA=25°C, VIN=0.2V, RL=10Kohm
• Average temperature coefficient is 1ppm/°C max at TA=-40°C to +85°C
• Slew rate is 0.8V/µs typ at +VS=5V, –VS=0V, TA=25°C, VIN=0.2V, RL=10Kohm
• 10-lead mini small outline package [MSOP], high performance grade package
• Temperature range from -40°C to +85°C

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