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Description:Fast, Voltage-Out DC-440 MHz, 95 dB Logarithmic Amplifier
Manufacturer:Analog Devices
Datasheet:PDF (606K).
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The AD8310 is a complete, dc440 MHz demodulating logarithmic amplifier (log amp) with a ver y fast voltage mode output, capable of driving up to 25 mA into a grounded load in under 15 ns. It uses the progressive compression (successive detection) technique to provide a dynamic range of up to 95 dB to 3 dB law conformance or 90 dB to a 1 dB error bound up to 100 MHz. It is extremely stable and easy to use, requiring no significant external components. A single-supply voltage of 2.7 V to 5.5 V at 8 mA is needed, corresponding to a power consumption of only 24 mW at 3 V. A fast-acting CMOScompatible enable pin is provided. Each of the six cascaded amplifier/limiter cells has a smallsignal gain of 14.3 dB, with a -3 dB bandwidth of 900 MHz. A total of nine detector cells are used to provide a dynamic range that extends from -91 dBV (where 0 dBV is defined as the amplitude of a 1 V rms sine wave), an amplitude of about 40 V, up to +4 dBV (or 2.2 V). The demodulated output is accurately scaled, with a log slope of 24 mV/dB and an intercept of 108 dBV. The scaling parameters are supplyand temperature-independent.

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