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Precision JFET-input op amp claims best-in-class signal acquisition and fast settling times

Analog Devices, Inc., has introduced a compact, 36-volt precision JFET-input (junction field-effect transistor input) operational amplifier (op amp) that claims to offer the industry's lowest noise and distortion over the widest 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 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 very low offset drift of 2 uV/ degrees C maximum over the -40 to +125 degrees C extended industrial temperature range, which is three times better than competitive offerings.

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. The proprietary process is optimised 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/uS (micro second) slew rate, 120-dB (typical) open-loop gain, and high output current capacity. The 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.

The ADA4627 has 6.1-nV/rt-Hz voltage noise and 120-uV typical offset voltage (200 uV/300 uV max for the A/B grades). The ±18-V ADA4627 JFET-input op amp operates from standard ±12-V and ±15-V industrial power supplies. It has a wide ±5-V to ±18-V operating-voltage range and is well-suited to functions that require accurate reproduction over a wide frequency range with minimal loading, including ADC (analogue-to-digital converter) drivers and buffers, DAC (digital-to-analogue converter) output buffers, high-source-impedance sensors and photo diodes.

The ADA4627 is optimised for interoperability with Analog Devices' data converter portfolio, including its PulSAR ADCs, such as the AD7949 14-bit, 8-channel, 250-kSPS PulSAR ADC and the AD7625 16-bit, 6 MSPS PulSAR differential ADC. Design tools available for use with the ADA4627 include the ADIsimOpAmp parametric evaluation tool, the NI Multisim Analog Devices Edition SPICE simulation program, and Analog Filter Wizard design and product selection tool.

Availability and Pricing

The ADA4627-1ARZ is available now for $6.75 each per 1,000 and is packaged in a 3 mm x 3 mm 8-pin SOIC.

The ADA4627-1ACPZ is available now for $6.75 each per 1,000 and is packaged in a 3 mm x 3 mm 8-pin LFCSP.

The ADA4627-1 BRZ is available now for $10.75 each per 1,000 and is packaged in a 3 mm x 3 mm 8-pin SOIC.

The ADA4627-1BCPZ is available now for $10.75 each per 1,000 and is packaged in a 3 mm x 3 mm 8-pin LFCSP.

Datasheet:

ADA4627

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