AD8309 - Analog Devices

AD8309 5 MHz.500 MHz 100 dB Demodulating Logarithmic Amplifier with Limiter Output

The AD8309 is a complete IF limiting amplifier, providing both an accurate logarithmic (decibel) measure of the input signal (the RSSI function) over a dynamic range of 100 dB, and a programmable limiter output, useful from 5 MHz to 500 MHz. It is easy to use, requiring few external components. A single supply voltage of +2.7 V to +6.5 V at 16 mA is needed,.

Features

Complete Multistage Log-Limiting IF Amplifier 100 dB Dynamic Range:
  –78 dBm to +22 dBm (Re 50 ⍀ ) Stable RSSI Scaling Over Temperature and Supplies: 20 mV/dB Slope,
  –95 dBm Intercept ؎0.4 dB RSSI Linearity up to 200 MHz Programmable Limiter Gain and Output Current Differential Outputs to 10 mA, 2.4 V p-p Overall Gain 100 dB, Bandwidth 500 MHz Constant Phase (Typical ؎80 ps Delay Skew) Single Supply of +2.7 V to +6.5 V at 16 mA Typical Fully Differential Inputs, RIN = 1 k ⍀, CIN = 2.5 pF 500 ns Power-Up Time, <1 ␮ A Sleep Current APPLICATIONS Receivers for Frequency and Phase Modulation Very Wi.