KH231

www.fairchildsemi.com KH231 Fast Settling, Wideband Buffer/Amplifier (Av = ±1 to ±5) Features s s s s s s General Description The KH231 Buffer/Amplifier is a wideband operational amplifier designed specifically for high-speed, lowgain applications. The KH231 is based on a current feedback op amp topology-a unique design that both eliminates the gain-bandwidth tradeoff and permits unprecedented high-speed performance. (See table below.) The KH231 Buffer/Amplifier is the ideal design alternative to low precision open-loop buffers and oscillationprone conventional op amps. The KH231 offers precise gains from ±1.000 to ±-5.000 and linearity that is a true 0.1%-even for demanding 50Ω loads. Open-loop buffers, on the other hand, offer a nominal gain of 0.95 ±0.03 and a linearity of only 3% for typical loads. A buffer’s settling time may look impressive but it is usually specified at unrealistically large load resistances or when the effects of thermal tail are not included; the KH231 Buffer/Amplifier settles to 0.05% in 15ns-while driving a 100Ω load. Offsets and drifts, usually a low priority in conventional high-speed op amp designs, were not ignored in the KH231; the input offset voltage is typically 1mV and input offset voltage drift is only 10µV/°C. The KH231 is stable and oscillation-free across the entire gain range and since it’s internally compensated, the user is saved the trouble of designing external compensation networks and having to “tweak” them in production. The ...