GENERAL DESCRIPTION
The AD8307 is the first logarithmic amplifier made available in an 8-lead SOIC_N package. It is a complete 500 MHz monolithic demodulating logarithmic amplifier based on the progressive compression (successive detection) technique, providing a dynamic range of 92 dB to ±3 dB law conformance and 88 dB to a tight ±1 dB error bound at all frequencies up to 100 MHz. The AD8307 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 7.5 mA is needed. A fast acting CMOS-compatible control pin can disable the AD8307 to a standby current of 150 μA.
The AD8307 operates over the industrial temperature range of −40°C to +85°C and is available in an 8-lead SOIC package and an 8-lead PDIP.

FEATURES
   Complete multistage logarithmic amplifier
   92 dB dynamic range: −75 dBm to +17 dBm to −90 dBm
      using matching network
   Single supply of 2.7 V minimum at 7.5 mA typical
   DC to 500 MHz operation, ±1 dB linearity
   Slope of 25 mV/dB, intercept of −84 dBm
   Highly stable scaling over temperature
   Fully differential dc-coupled signal path
   100 ns power-up time, 150 μA sleep current
  
APPLICATIONS
   Conversion of signal level to decibel form
   Transmitter antenna power measurement
   Receiver signal strength indication (RSSI)
   Low cost radar and sonar signal processing
   Network and spectrum analyzers (to 120 dB)
   Signal level determination down to 20 Hz
   True decibel ac mode for multimeters