High-voltage amplifiers designed for accuracy in error-sensitive industrial applications

Three new amplifiers offering a combination of high speed and high precision that allow designers to create more accurate circuits for error-sensitive applications are now available from Texas Instruments.

The new devices support more precise measurement and faster processing of a variety of input signals in test and measurement, medical, and data-acquisition systems.

Designers can select the amplifier architecture that meets their system requirements, with input voltages, bandwidths and various key features, such as OPA2810: 27-V junction gate field-effect transistor (JFET)-input dual operational amplifier (op amp), 120-MHz bandwidth, and 500-microV max offset voltage.

Other key features include OPA189: 36-V zero-drift op amp, 14-MHz bandwidth, multiplexer (MUX) friendly, THS3491: 32-V current-feedback amplifier, 900-MHz small-signal bandwidth and ±420-mA output current.

Delivering up to twice the bandwidth and slew rate of competitive devices, says TI, these high-voltage amplifiers enable a variety of system-level benefits.

The high bandwidths of the OPA2810 and OPA189 enable high-gain configurations and faster response times for more accurate measurements.

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-Vpeak-to-peak output levels at 200 MHz into 100-Ohm loads for test and measurement systems, such as arbitrary waveform generators, laser diode drivers and high capacitive load drive applications.

The precision of these high-voltage amplifiers helps maximise system accuracy, while reducing the need for external calibration.

With a maximum offset and lowest voltage noise of 5.7 nV/√Hz for 27 V amplifiers in the 100- to 200-MHz bandwidth range, the OPA2810 op amp allows engineers to achieve more precise measurements in data-acquisition and signal-processing applications.

The OPA189 is the widest bandwidth zero-drift op amp with the lowest noise of 5.2 nV/√Hz. With a low maximum drift of 0.02-microV/degrees C, the OPA189 also minimises temperature error without calibration, increasing system accuracy over an extended temperature range.

TI’s new amplifiers enable low-power operation in high-speed designs.

The 120-MHz OPA2810 op amp offers best-in-class current consumption of 3.6 mA, while providing excellent signal-to-noise ratio and distortion, says the company.

Designed for applications that require high gain and low distortion in power-sensitive designs, the OPA189 is said to be the lowest power zero-drift op amp with a 14-MHz bandwidth.

This device enables engineers to design high-resolution, noise-sensitive industrial systems while consuming 1.3 mA of quiescent current, which can benefit analogue input modules, and battery and LCD test equipment.

http://www.ti.com