GENERAL DESCRIPTION

The AD8314 is a complete low cost subsystem for the measurement and control of RF signals in the frequency range of 100 MHz to 2.7 GHz, with a typical dynamic range of 45 dB, intended for use in a wide variety of cellular handsets and other wireless devices. It provides a wider dynamic range and better accuracy than possible using discrete diode detectors. In particular, its temperature stability is excellent over the full operating range of −40°C to +85°C.

Its high sensitivity allows control at low power levels, thus reducing the amount of power that needs to be coupled to the detector. It is essentially a voltage-responding device, with a typical signal range of 1.25 mV to 224 mV rms or –58 dBV to −13 dBV. This is equivalent to −45 dBm to 0 dBm, re 50 Ω.

FEATURES

Complete RF detector/controller function

Typical range:−58 dBV to −13 dBV

−45 dBm to 0 dBm, re 50 Ω

Frequency response from 100 MHz to 2.7 GHz

Temperature-stable linear-in-dB response

Accurate to 2.7 GHz

Rapid response: 70 ns to a 10 dB step

Low power: 12 mW at 2.7 V

Power down to 20 μA

APPLICATIONS

Cellular handsets (TDMA, CDMA , GSM)

RSSI and TSSI for wireless terminal devices

Transmitter power measurement and control