RF power detector

Analog Devices’ AD8312 is a radio frequency power detector for cellular handsets that enables precise, temperature-stable power control across a wide dynamic range.

Analog Devices’ AD8312 is a radio frequency (RF) power detector for cellular handsets that enables precise, temperature-stable power control across a wide dynamic range.

Designed for all current and emerging cellular standards, including GSM, CDMA, W-CDMA and TD-SCDMA, the AD8312 is available in a small 6-pin 1 mm x 1.5 mm package that the company says requires two-thirds the board space of other solutions.

The AD8312 measures signals at operating frequencies of less than 50 MHz and up to 2.7 GHz with 45 dB of dynamic range and provides precise, temperature-stable performance over the full range of -40 to + 85 degrees Celsius with +/- 1 dB of accuracy. The sensitivity of the AD8312 allows measurement at low power levels, thus reducing the amount of power being coupled to the detector.

In addition to cellular handsets, the AD8312 is suitable for other wireless devices, such as RSSI (Received Signal Strength Indicator) and TSSI (Transmitted Signal Strength Indicator) wireless terminal devices, and transmitter power measurement.

The AD8312 is available in sample quantities now, with volume production in March 2005. The device is offered in a space-saving 6-pin 1 mm x 1.5 mm WLCSP (wafer level chip-scale package) and consumes 4.5mA from a 2.7V to 5.5V supply. The AD8312 is priced at $1.07 per unit in 1,000-piece quantities.

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