AD641 Datasheet - Analog Devices

AD641 250 MHz Demodulating Logarithmic Amplifier

The AD641 is a 250 MHz, demodulating logarithmic amplifier with an accuracy of ± 2.0 dB and 44 dB dynamic range. The AD641 uses a successive detection architecture to provide an output current that is logarithmically proportional to its input voltage. The output current can be converted to a voltage.

AD641 Features

* Logarithmic Amplifier Performance Usable to 250 MHz 44 dB Dynamic Range ؎2.0 dB Log Conformance 37.5 mV/dB Voltage Output Stable Slope and Intercepts 2.0 nV/√Hz Input Noise Voltage 50 ␮V Input Offset Voltage Low Power ؎5 V Supply Operation 9 mA (+VS), 35 mA (

* VS) Quiescent Current Onboard Re

AD641_AnalogDevices.pdf