0.1 GH TO 2.5 GH, 70 B Logarithmic Detector / Controller

The AD8313 is a complete multistage demodulating logarithmic amplifier that can accurately convert an RF signal at its input 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. Application is straightforward, requiring only a single supply of 2.7 V to 5.5 V and the addition of a suitable input and supply decoupling. Operating on a 3 V supply, its 13.7 mA consumption (for TA = 25°C) is only 41 mW. A power-down feature is provided; the input is taken high to initiate a low current (20 µA) sleep mode, with a threshold at half the supply voltage

The AD8313 is fabricated on Analog Devices, Inc., advanced 25 GHz silicon bipolar IC process and is available in an 8-lead MSOP package. The operating temperature range is −40°C to +85°C.

* Wide bandwidth:

0.1 GHz to 2.5 GHz min

* High dynamic range:

70 dB to ±3.0 dB

* High accuracy: ±1.0 dB over 65 dB range (@ 1.9 GHz)

* Fast response:

40 ns full-scale typical

* Controller mode with error output

* Scaling stable over supply and temperature

* Wide supply range:

2.7 V to 5.5 V

* Low power:

40 mW at 3 V

* Power-down feature:

60 mW at 3 V