High voltage amplifiers for error-sensitive industrial applications

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By Nick Flaherty

The OPA2810 is a 27V junction gate field-effect transistor (JFET)-input dual operational amplifier (op amp) with a 120MHz bandwidth and 500µV max offset voltage, the OPA189 is a multiplexer (MUX) friendly 36V zero-drift op amp with a 14MHz bandwidth and the THS3491 32V current-feedback amplifier has a 900MHz small-signal bandwidth and ±420mA output current for industrial communications lines.

The high bandwidths of the OPA2810 and OPA189 enable high-gain configurations and faster response times for more accurate measurements while designers can use the THS3491 current-feedback amplifier’s wide small-signal bandwidth, high slew rate and output current of ±420 mA to achieve low distortion and high output power levels. The THS3491 is capable of 10-Vp-p output levels at 200 MHz into 100-Ω loads for test and measurement systems, such as arbitrary waveform generators, laser diode drivers and high capacitive load drive applications.

With a maximum offset and lowest voltage noise of 5.7 nV/√Hz the OPA2810 op amp allows engineers to achieve more precise measurements in data-acquisition and signal-processing applications, while the OPA189 is the widest bandwidth zero-drift op amp with the lowest noise of 5.2 nV/√Hz. The maximum drift of 0.02 μV/°C also minimises temperature error without calibration, increasing system accuracy over an extended temperature range.

The amplifiers have been designed for lower power, with the 120MHz OPA2810 op amp using 3.6 mA while providing excellent signal-to-noise ratio and distortion. Similarly the OPA189 has a quiescent current of 1.3mA for analogue input modules and battery and LCD test equipment.

Availability and pricing

The OPA189 and THS3491 amplifiers are now available in volume quantities through the TI store and authorized distributors. Additionally, the OPA2810DGKEVM evaluation module is available through the TI store and authorized distributors, with production quantities of the OPA2810 amplifier available in 3Q 2018.



Evaluation module (EVM)


Pricing in 1,000-unit quantities

Order now

OPA2810 JFET-input op amp


8-pin SOT-23

8-pin VSSOP

Starting at $1.98



OPA189 zero-drift op amp



8-pin SOIC

Starting at $0.96



THS3491 current-feedback op amp



8-pin SOIC

16-pin VQFN

Starting at $6.20




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