A 10-GHz RMS detector offers 0.2-dB linearity over a 43-dB dynamic range at 2.14 GHzeven for signals with high-crest-factor modulation used in 3G and 4G broadband wireless networks. Dubbed the LTC5582, it vows to accurately measure signal levels as low as -56 dBm to +1 dBm to 1 dB error. The RMS detector provides a 57-dB dynamic range from 450 MHz to 2.7 GHz. The device offers 46 dB of useful dynamic range at 6 GHz and 38 dB at 10 GHz. From -40 to +85C, it can deliver 48 dB of dynamic range with linearity accuracy of 1 dB. The LTC5582 can process signals with a rise time of 500 ns and fall time of 4.5 s. The RMS detector is powered from a single 3.3-V supply with an operating current of 42 mA. An enable pin allows the chip to power down. When in shutdown mode, the device draws trickle current of less than 10 A. Its RF input is designed to operate single-ended, requiring no external balun transformer. The LTC5582's log-linear response converts the RF signal levels into a linearly proportional DC voltage. P&A: starting at $6.25 in 1000-piece quantities.
Linear Technologies, 1630 McCarthy Blvd., Milpitas, CA 95035-7417; (408) 432-1900, FAX: (408) 434-0507, Internet: www.linear.com.
