RF Power Measurement ICs Extend Battery Life

Emerging as the industry's smallest power measurement ICs for cellular handsets, the ADL5500 power detector and AD8311 power controller come in packages measuring 0.6 mm thick and employ a precision circuit design to accurately measure and control transmitter output signals independent of temperature variations. The 1 mm x 1 mm ADL5500 RMS-power detector is optimized for CDMA, CDMA2000 (including 1xEV-DO), TD-SCDMA, W-CDMA, and terminal devices for 802.16, WiMAX. It features an accuracy of ±0.25 dB linear response up to 2.5 GHz and a temperature stability of 0.1 dB variation over a temperature range from -40°C to +85°C. The device operates from a single supply from 2.7V to 5.5V and consumes 3.3 mW at 3V. Measuring 1 mm x 1.5 mm, the AD8311 logarithmic power controller is designed for GSM/GPRS power amplifiers operating in the frequency range of 100 MHz to 2.5 GHz and over a typical dynamic range of 45 dB. The device consumes 8.5 mA from a 2.7V to 5.5V supply. Prices for the ADL5500 and AD8311 are $0.90 and $1.20 each/10,000, respectively. ANALOG DEVICES INC., Wilmington, MA. (800) 262-5643.