The LOG200 is a wide-dynamic-range current-to-voltage amplifier specifically designed to optimize current measurements across 160 dB of dynamic range with unparalleled accuracy and speed. The LOG200 features two logarithmic amplifiers, followed by a high-accuracy differential amplifier to convert current signals into a single-ended voltage that represents the log-compressed ratio of the two currents. The current inputs are designed to feature a high-speed response from one input, and a highly accurate reference signal on the other input, allowing for a unique combination of fast transient response and high logarithmic conformity. The LOG200 ratio is internally set to 250 mV/decade of current-to-voltage conversion.

The LOG200 integrates an uncommitted high-speed amplifier to allow the output to be configured for a differential- or filtered-response output. The device also features a precise reference current and reference voltages designed to configure the device for optimal input current and common-mode voltages. The LOG200 operates with a single-ended 5-V supply or bipolar ±5-V supplies, with a total supply range from 4.5 V to 12.6 V. VCM can be driven by either of the onboard voltage references (REF25 or REF165), or by an external source. I2 can be driven by an external source but is typically driven by the onboard current reference, IREF.