A new high-input-impedance (Hi-Z) buffer amplifier with what Texas Instruments (TI) said is the industry’s widest bandwidth is designed to simplify front-end designs and eliminate the need for custom application-specific integrated circuits (ASICs), potentially saving months of design time for test and measurement engineers.
The BUF802 supports frequency bandwidths as high as 3 GHz, enabling high signal throughput and minimal input settling time. Designers can leverage its capabilities to measure high-frequency signals more accurately in oscilloscopes, active probes, high-frequency data acquisition systems and other test and measurement applications.
Previously, this level of bandwidth capacity was only possible with ASICs, the integration of which can add to system design time, complexity and cost. Alternatives to ASIC-based design implementations required dozens of discrete components such as field-effect transistors (FETs), protection diodes and transistors. These, too, add to bill-of-materials (BOM) cost and system complexity — and are unable to deliver the same bandwidth as ASICs, thus limiting the signal throughput of data acquisition applications.
The BUF802, by contrast, supports faster time-to-market, in addition to a wide dynamic range at what TI says is a fraction of the cost. Its single-chip alternative to ASICs or FET-input amplifier-based implementations integrates the features of discrete components while also providing 10 times wider bandwidth than FET-input amplifiers, matching the performance of custom ASICs.
TI adds that the BUF802 is the industry’s first buffer to enable quiescent current adjustment for a range of bandwidth and signal swing requirements — from 100 MHz to 3 GHz at 1 V peak to peak (VPP), and as high as 2 GHz at 2 VPP. This wide adjustment range for bandwidth and signal swing supports front-end design scalability across multiple data acquisition applications, easing system cost and redesign.
The device can be used as a standalone buffer, where it can help achieve high input impedance and high slew rates in applications that can tolerate 100 mV offsets, or where the signal chain is AC-coupled. The BUF802 can also be used in a composite loop with a precision amplifier to achieve high DC precision and 3GHz bandwidth in applications requiring 1 μV/° C maximum offset drift.
A low-cost evaluation model is also available.