High-Voltage Amplifiers Target Error-Sensitive Applications

Texas Instruments (TI) has introduced three new amplifiers that offer a combination of high speed and high precision, allowing designers to create more accurate circuits for error-sensitive applications.  With maximum supply voltages ranging from 27 V to 36 V, the new devices support more precise measurement and faster processing of a wide 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 key features. The OPA2810 is a 27-V junction gate field-effect transistor (JFET)-input dual operational amplifier (op amp) with 120-MHz bandwidth and 500-µV max offset voltage. The OPA189 is a 36-V zero-drift op amp with 14-MHz bandwidth and is multiplexer (MUX) friendly. And finally, the THS3491 is a 32-V current-feedback amplifier with
900-MHz small-signal bandwidth and ±420-mA output current.

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-Ω loads for test and measurement systems, such as arbitrary waveform generators, laser diode drivers and high capacitive load drive applications.

With an industry-leading 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. According to TI, 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 μV/°C, the OPA189 also minimizes temperature error without calibration, increasing system accuracy over an extended temperature range.

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. Designed for applications that require high gain and low distortion in power-sensitive designs, the OPA189 is 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 only consuming 1.3 mA of quiescent current, which can benefit analog input modules, and battery and LCD test equipment. TI’s new high-voltage amplifiers are available with at prices ranging from $1.98 to $6.20.

Texas Instruments | www.ti.com