OPA818 13 V Decompensated 7 V/V FET-Input Op Amp

Texas Instruments' OPA818 decompensated voltage-feedback op amp is designed for high-speed and wide dynamic range applications. The op amp has a low-noise junction gate field-effect transistor (JFET) input stage that combines high-gain bandwidth with a wide supply range of 6 V to 13 V. The fast slew rate of 1,400 V/µs provides high large-signal bandwidth and low distortion. This amp is manufactured using Texas Instruments' proprietary, high-speed SiGe process to achieve significant performance improvements over other high-speed FET-input amps.

The OPA818 is an extremely versatile, wideband TIA photodiode amp suitable for optical test and communication equipment, and medical, scientific, and industrial instruments. The device showcases 2.7 GHz gain-bandwidth, a low total input capacitance of 2.4 pF, and an input noise of 2.2 nV/√Hz. The op amp can achieve over 85 MHz signal bandwidth in TIA configuration with 20 kΩ TIA gain (RF) and 0.5 pF photodiode capacitance (CD) with wide output swings. The decompensated, low-noise architecture with Pico amperes of input bias current is well-suited for high-gain test and measurement applications. Though normally stable in gains of ≥7 V/V, the OPA818 can be used in applications with lower gains by applying noise-gain shaping techniques. The OPA818 device is available in an 8-lead WSON package with an exposed thermal pad for heat dissipation. This amp operates over the industrial temperature range of -40°C to +85°C.