Texas Instruments (TI) has introduced three amplifiers with a combination of high speed and high precision, allowing designers to create more accurate circuits for error-sensitive applications. The 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 as follows:
• OPA2810: 27V junction gate field-effect transistor (JFET)-input dual operational amplifier (op amp), 120MHz bandwidth, 500µV max offset voltage.
• OPA189: 36V zero-drift op amp, 14MHz bandwidth, multiplexer (MUX) friendly.
• THS3491: 32V current-feedback amplifier, 900MHz small-signal bandwidth, ±420mA output current.
Wider bandwidth and faster speeds
Delivering up to twice the bandwidth and slew rate of competitive devices, TI’s new high-voltage amplifiers enable the following 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 ±420mA to achieve low distortion and high output power levels. The THS3491 is capable of 10V peak-to-peak output levels at 200MHz into 100Ω loads for test and measurement systems, such as arbitrary waveform generators, laser diode drivers and high capacitive load drive applications.
Optimized precision for error-sensitive applications
The exceptional precision of these high-voltage amplifiers maximizes system accuracy, while reducing the need for external calibration and minimizing bill-of-materials (BOM) cost. Precision benefits include:
• With an industry-leading maximum offset and lowest voltage noise of 5.7nV/√Hz for 27V amplifiers in the 100- to 200MHz 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 5.2nV/√Hz. With a low maximum drift of 0.02μV/°C, the OPA189 also minimizes temperature error without calibration, increasing system accuracy over an extended temperature range.
Lower power consumption
Consuming up to 80% less power than competitive devices, TI’s new amplifiers enable low-power operation in high-speed designs:
• The 120MHz OPA2810 op amp offers best-in-class current consumption of 3.6mA, 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 14MHz bandwidth. This device enables engineers to design high-resolution, noise-sensitive industrial systems while only consuming 1.3mA of quiescent current, which can benefit analog input modules, and battery and LCD test equipment.
Tools and support to speed design
Engineers can jump-start the design of their high-voltage systems with the Reference Design Maximizing Signal Dynamic Range for True 10Vpp Differential Input to 20Bit ADC.
Package, availability and pricing
TI’s new high-voltage amplifiers are available with packages and pricing as listed in the table below. 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 today through the TI store and authorized distributors, with production quantities of the OPA2810 amplifier available in 3Q 2018.
