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Description

The AD8313 is a complete multistage demodulating logarithmic amplifier that can accurately convert an RF signal at its differentia linput to an equivalent decibel-scaled value at its dc output. The AD8313 maintains a high degree of log conformance for signal frequencies from 0.1 GHz to 2.5 GHz and is useful over the range of10 MHz to 3.5 GHz.The nominal input dynamic range is –65 dBm to 0 dBm (re:50 Ω),and the sensitivity can be increased by6 dBormore with a narrow-band input impedance matching network ora balun. Application is straight forward, requiring only a single supply of 2.7 V to 5.5 V and the addition ofa suitable input and supply decoupling.Operating on a 3 V supply, its 13.7 mA consumption (forTA= 25°C) is only 41 mW. A power-down feature is provided; the input is taken highto initiate a low current (20 µA) sleep mode, with a threshold at
half the supply voltage.

Features

1. Wide bandwidth: 0.1 GHz to2.5 GHz min
2. High dynamic range: 70 dB to±3.0 dB
3. High accuracy: ±1.0 dB over 65dB range (@ 1.9 GHz)
4. Fast response: 40 ns full-scale typical
5. Controller mode with error output
6. Scaling stable over supply and temperature
7. Wide supply range: 2.7 V to5.5 V
8. Low power: 40 mW at3 V
9. Power-down feature: 60mW at 3 V
10. Complete andeasy to use

Applications 

1. RF transmitter power amplifier setpointcontrol and level monitoring
2. Logarithmic amplifier for RSSI measurement cellular base stations, radio link, radar