The AD641 is a 250MHz demodulating logarithmic amplifier with 44dB dynamic range and 37.5mV/dB voltage output
The AD641 is a complete logarithmic solution designed for compressing and measuring wide dynamic range signals in IF/RF systems. It utilizes a successive detection architecture to provide an output current that is logarithmically proportional to its input voltage, with log conformance of 2.0 dB over the input range -44 dBm to 0 dBm.
The device features onboard resistors and a 10x attenuator for flexibility in slope selection. It operates from a +5 V supply with low quiescent current and is available in industrial (-40°C to +85°C) and military (-55°C to +125°C) temperature ranges.
| 3 dB Bandwidth | 250 MHz |
|---|---|
| Dynamic Range (Single) | 44 dB |
| Log Conformance Accuracy | +2.0 dB |
| Supply Voltage Range | +4.5 V to +7.5 V |
| Quiescent Current (+Vs) | 9 mA (Typical) |
The amplifier maintains logarithmic performance up to 250 MHz.
Yes, it features onboard resistors and a 10x attenuator for slope selection.
Industrial versions operate from -40°C to +85°C.