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AD8315ARM-REEL7 Datasheet(PDF) 1 Page - Analog Devices |
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AD8315ARM-REEL7 Datasheet(HTML) 1 Page - Analog Devices |
1 / 20 page REV. B AD8315 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective companies. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 © 2003 Analog Devices, Inc. All rights reserved. 50 dB GSM PA Controller FUNCTIONAL BLOCK DIAGRAM 10dB OFFSET COMP’N INTERCEPT POSITIONING 10dB 10dB 10dB DET DET DET DET DET RFIN 1.35 HI-Z LOW NOISE (25nV/ Hz) RAIL-TO-RAIL BUFFER V-I VSET 23mV/dB 250mV to 1.4V = 50dB FLTR VAPC OUTPUT ENABLE DELAY LOW NOISE BAND GAP REFERENCE LOW NOISE GAIN BIAS COMM VPOS ENBL FEATURES Complete RF Detector/Controller Function >50 dB Range at 0.9 GHz (–49 dBm to +2 dBm re 50 ) Accurate Scaling from 0.1 GHz to 2.5 GHz Temperature-Stable Linear-in-dB Response Log Slope of 23 mV/dB, Intercept at –60 dBm at 0.9 GHz True Integration Function in Control Loop Low Power: 20 mW at 2.7 V, 38 mW at 5 V Power Down to 10.8 W APPLICATIONS Single, Dual, and Triple Band Mobile Handset (GSM, DCS, EDGE) Transmitter Power Control PRODUCT DESCRIPTION The AD8315 is a complete low cost subsystem for the precise control of RF power amplifiers operating in the frequency range 0.1 GHz–2.5 GHz and over a typical dynamic range of 50 dB. It is intended for use in cellular handsets and other battery-operated wireless devices. The log amp technique provides a much wider measurement range and better accuracy than controllers using diode detectors. In particular, its temperature stability is excellent over a specified range of –30 ∞C to +85∞C. Its high sensitivity allows control at low signal levels, thus reduc- ing the amount of power that needs to be coupled to the detector. For convenience, the signal is internally ac-coupled. This high-pass coupling, with a corner at approximately 0.016 GHz, determines the lowest operating frequency. Thus, the source may be dc grounded. The AD8315 provides a voltage output, VAPC, that has the voltage range and current drive to directly connect to most hand- set power amplifiers’ gain control pin. VAPC can swing from 250 mV above ground to within 200 mV below the supply voltage. Load currents of up to 6 mA can be supported. The setpoint control input is applied to pin VSET and has an operating range of 0.25 V–1.4 V. The associated circuit deter- mines the slope and intercept of the linear-in-dB measurement system; these are nominally 23 mV/dB and –60 dBm for a 50 W termination (–73 dBV) at 0.9 GHz. Further simplifying the application of the AD8315, the input resistance of the setpoint interface is over 100 M W, and the bias current is typically 0.5 mA. The AD8315 is available in MSOP and lead frame chip scale (LFCSP) packages and consumes 8.5 mA from a 2.7 V to 5.5 V supply. When powered down, the sleep current is 4 mA. |
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