Electrometer-grade amplifiers reduce chemical analyzer size and accuracy

Photocoupler

Analog Devices, Inc. ( ADI ), the world's leading provider of high-performance signal processing solutions, recently introduced the ADA4530-1 , an electrometer-grade operational amplifier that is compact and ensures that chemical analysis instruments are available over a wider temperature range. Maximum precision and data repeatability are achieved, reducing overall material cost and design size. The success of the ADA4530-1 op amp is that its bias current is extremely low, one-twentieth or even lower for competing products. This low bias current makes the ADA4530-1 a sensor that is sensitive to output loads (such as photodiodes) and other high-output impedance sensors commonly used in precision monitoring/analysis equipment (such as spectrophotometers, chromatographs, mass spectrometers, Ideal for constant potential and constant current Coulomb analytical measurement equipment. The new amplifiers can also be used as front-end amplifiers for picoammeters and coulomb measurement systems, transimpedance amplifiers for photodiodes, ionization chambers and working electrode measurements, or high-impedance buffers for chemical and capacitive sensors.

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The ADA4530-1 op amp has an input bias current of 250 fA at 125 ° C, which is one-twentieth of its competitors, dropping to 20 fA at 85 ° C, which is one-fifth of the competition. In addition, the ADA4530-1 is the only op amp capable of maintaining the same 20 fA input bias current from room temperature to 85 ° C. It is the only one in its class that passes from room temperature to 125 ° C. Fully bias current production test amplifier. The closest competitor to this product rarely reaches the 125°C standard, and none of them are tested for bias current production at room temperature. Bias currents prevent system designers from taking full advantage of sensor sensitivity because they need to reserve some guard bands for large variations in bias current.

The ADA4530-1 also features an on-chip guard buffer that tracks the input common-mode voltage and provides an output to drive the PCB guard ring or interconnected shield to reduce stray capacitance in the sensitive connector between the sensor and the amplifier. influences. This simplifies the sensor interface design, eliminating the need for customers to design separate circuits for the required output drivers, which reduces design time, cost, and PCB space.

Main features of the ADA4530-1 electrometer-level operational amplifier

· Ultra low bias current

20 fA @ 25°C (maximum, after production test)

20 fA @ 85°C (maximum)

250 fA @ 125°C (maximum, production tested)

· Integrated protection buffer

· Wide supply voltage range: ±2.5 to ±8 V or 5 to 16 V

Quotation and supply