GENERAL DESCRIPTION
The AD8319 is a demodulating logarithmic amplifier, capable of accurately converting an RF input signal to a corresponding decibel-scaled output. It employs the progressive compression technique over a cascaded amplifier chain, each stage of which is equipped with a detector cell. The device can be used in either measurement or controller modes. The AD8319 maintains accurate log conformance for signals of 1 MHz to 8 GHz and provides useful operation to 10 GHz. The input dynamic range is typically 45 dB (re: 50 Ω) with error less than ±3 dB. The AD8319 has 6 ns/10 ns (fall time/rise time) response time that enables RF burst detection to a pulse rate of beyond 50 MHz. The device provides unprecedented logarithmic intercept stability vs. ambient temperature conditions. A supply of 3.0 V to 5.5 V is required to power the device. Current consumption is typically 22 mA, and it decreases to 200 µA when the device is disabled.

FEATURES
   Wide bandwidth: 1 MHz to 10 GHz
   High accuracy: ±1.0 dB over temperature
   45 dB dynamic range up to 8 GHz
   Stability over temperature: ±0.5 dB
   Low noise measurement/controller output VOUT
   Pulse response time (fall/rise): 6 ns/10 ns
   Small footprint: 2 mm × 3 mm LFCSP
   Supply operation: 3.0 V to 5.5 V @ 22 mA
   Fabricated using high speed SiGe process

APPLICATIONS
   RF transmitter PA setpoint controls and level monitoring
   Power monitoring in radiolink transmitters
   RSSI measurement in base stations, WLANs, WiMAX,
      and radars