Part # AD8315 datasheet

Part Manufacturer: Analog Devices

Analog Devices

Part Description: AD8315 50 dB GSM PA Controller Data Sheet (Rev. C)

Part Details:

50 dB GSM PA Controller AD8315 FEATURES Its high sensitivity allows control at low signal levels, thus Complete RF detector/controller function reducing the amount of power that needs to be coupled to >50 dB range at 0.9 GHz (-49 dBm to +2 dBm, re 50 ) the detector. Accurate scaling from 0.1 GHz to 2.5 GHz For convenience, the signal is internally ac-coupled. This Temperature-stable linear-in-dB response high-pass coupling, with a corner at approximately 0.016 GHz, Log slope of 23 mV/dB, intercept at -60 dBm at 0.9 GHz determines the lowest operating frequency. Therefore, the True integration function in control loop source can be dc grounded. Low power: 20 mW at 2.7 V, 38 mW at 5 V Power-down to 10.8 W The AD8315 provides a voltage output, VAPC, that has the voltage range and current drive to directly connect to most APPLICATIONS handset power amplifiers gain control pin. VAPC can swing from 250 mV above ground to within 200 mV below the supply Single, dual, and triple band mobile handset (GSM, DCS, EDGE) voltage. Load currents of up to 6 mA can be supported. Transmitter power control The setpoint control input is applied to the VSET pin and has GENERAL DESCRIPTION an operating range of 0.25 V to 1.4 V. The associated circuit determines the slope and intercept of the linear-in-dB The AD8315 is a complete low cost subsystem for the precise measurement system; these are nominally 23 mV/dB and control of RF power amplifiers operating in the frequency range -60 dBm for a 50 termination (-73 dBV) at 0.9 GHz. 0.1 GHz to 2.5 GHz and over a typical dynamic range of 50 dB. Further simplifying the application of the AD8315, the input It is intended for use in cellular handsets and other battery- resistance of the setpoint interface is over 100 M, and the bias operated wireless devices. The log amp technique provides a current is typically 0.5 A. much wider measurement range and better accuracy than controllers using diode detectors. In particular, its temperature The AD8315 is available in MSOP and LFCSP packages and stability is excellent over a specified range of -30°C to +85°C. consumes 8.5 mA from a 2.7 V to 5.5 V supply. When powered down, the sleep current is 4 A. FUNCTIONAL BLOCK DIAGRAM VPOS LOW NOISE OUTPUT LOW NOISE BAND GAP ENABLE ENBL GAIN BIAS REFERENCE

Please click the following link to download the datasheet:

AD8315.pdf Datasheet