AD8310

01084-001 Fast, Voltage-Out, DC to 440 MHz, 95 dB Logarithmic Amplifier AD8310 FEATURES Multistage demodulating logarithmic amplifier Voltage output, rise time <15 ns High current capacity: 25 mA into grounded RL 95 dB dynamic range: −91 dBV to +4 dBV Single supply of 2.7 V min at 8 mA typ DC to 440 MHz operation, ±0.4 dB linearity Slope of +24 mV/dB, intercept of −108 dBV Highly stable scaling over temperature Fully differential dc-coupled signal path 100 ns power-up time, 1 mA 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 Signal-level determination down to 20 Hz True-decibel ac mode for multimeters FUNCTIONAL BLOCK DIAGRAM SUPPLY +INPUT –INPUT COMMON VPOS 5 8mA BAND GAP REFERENCE AND BIASING AD8310 ENBL 7 ENABLE INHI 8 1.0kΩ 1 INLO 3 SIX 14.3dB 900MHz AMPLIFIER STAGES MIRROR 2μA /dB NINE D...