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Industry News / Semiconductors / Integrated Circuits

Analog Devices' Precision JFET-Input Op Amp Achieves Low Offset and Drift

August 27, 2009
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Analog Devices Inc. (ADI), a leader in high performance semiconductors for signal-processing applications and leading provider of amplifier technology, introduced a compact, 36 V precision JFET-input (junction field-effect transistor input) operational amplifier (op amp) with low noise and distortion over a wide temperature range. The 19 MHz ADA4627 JFET-input op amp specifies 5 pA (picoamp) maximum bias current at 25 degrees C and 500 pA maximum over the industrial temperature range of –40 degrees C to 85 degrees C, which is ten times lower than competing JFET-input amplifiers. The ADA4627 JFET-input op amp also offers best-in-class DC precision with low offset drift of 2µV/°C maximum over the -40 degrees C to +125 degrees C extended industrial temperature range.

Designed for applications that require accurate signal acquisition and fast settling times, such as optical, broadband and microwave communications systems; high-speed data acquisition systems; professional audio equipment; medical and electronic instrumentation; and automated test equipment—the ADA4627 JFET-input op amp is the first product created with ADI’s dielectrically-isolated iPolar® 36 V precision process technology. This proprietary process is optimized for linear circuits and enables both higher performance and extended signal chain integration in industrial and instrumentation applications.

The ADA4627 JFET-input op amp reduces signal distortion by a factor of two featuring an 82-V/µS (micro second) slew rate, 120 dB (typical) open-loop gain and high output current capacity. The exceptional combination of high drive, high slew rate and high open-loop gain also allows the ADA4627 to achieve the low-distortion levels required by precision instrumentation and professional audio equipment while driving impedances as low as 600 ohms.


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