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Power detector, controller conserve talk time in cellular handsets

Posted: 17 Jun 2005 ?? ?Print Version ?Bookmark and Share

Keywords:analog devices? adi? power measurement ic? adl5500? ad8311?

ICs suit cellular handsetsAnalog Devices Inc. (ADI) has introduced power measurement ICs that are housed in 0.6mm thick packages for cellular handsets. Model ADL5500 is a power detector and model AD8311 is a power controller IC. Both chips are optimized for high accuracy and temperature stability.

The ADL5500 RMS power detector is optimized for CDMA, cdma2000 (including 1xEV-DO), TD-SCDMA and W-CDMA cellular handsets, as well as for terminal devices for 802.16, WiMAX and emerging wireless systems with high-crest-factor waveforms. Integrating an AC coupling capacitor, a 50? matching resistor and a filter capacitor, the device is specified with accuracy of 0.25dB linear response up to 2.5GHz and temperature stability of 0.1dB variation over the -40C to 85C range. It requires a single 2.7Vdc to 5.5Vdc supply and consumes 3.3mW at 3Vdc.

The AD8311 logarithmic power controller is designed to provides precise control of RF power amplifiers (PA) operating in the frequency range of 100MHz to 2.5GHz and over a typical 45dB dynamic range. Housed in a 1-by-1.5mm package, it is well suited for use in GSM/GPRS cellular handsets. When biased from a single 2.7Vdc to 5.5Vdc supply, it consumes 8.5mA of current.

The ADL5500 is already sampling, with production quantities scheduled for July 2005, and is priced at 90 cents per unit. Already available, the AD8311 is priced at $1.20 per unit. Both pricing is for 10,000-piece quantities. Additional information on the AD8311 and ADL5500 can be found online.

- Janine Love

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