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AD8314ARM-REEL7 датащи(PDF) 1 Page - Analog Devices |
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AD8314ARM-REEL7 датащи(HTML) 1 Page - Analog Devices |
1 / 16 page REV. 0 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a AD8314 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 1999 100 MHz–2500 MHz 45 dB RF Detector/Controller FEATURES Complete RF Detector/Controller Function Typical Range –58 dBV to –13 dBV –45 dBm to 0 dBm re 50 Frequency Response from 100 MHz to 2.5 GHz Temperature-Stable Linear-in-dB Response Accurate to 2.5 GHz Rapid Response: 70 ns to a 10 dB Step Low Power: 12 mW at 2.7 V Power-Down to 20 A APPLICATIONS Cellular Handsets (TDMA, CDMA, GSM) RSSI and TSSI for Wireless Terminal Devices Transmitter Power Measurement and Control PRODUCT DESCRIPTION The AD8314 is a complete low-cost subsystem for the mea- surement and control of RF signals in the frequency range 0.1 GHz–2.5 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 –30 °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. For convenience, the signal is internally ac-coupled, using a 5 pF capacitor to a load of 3 k Ω in shunt with 2 pF. This high-pass coupling, with a corner at 16 MHz, determines the lowest oper- ating frequency. Thus, the source may be dc-grounded. The AD8314 provides two voltage outputs. The first, called V_UP, increases from close to ground to about 1.2 V as the input signal level increases from 1.25 mV to 224 mV. This output is intended for use in measurement mode. Consult the Appli- cations section of this data sheet for information on use in this mode. A capacitor may be connected between the V_UP and FLTR pins when it is desirable to increase the time interval over which averaging of the input waveform occurs. The second output, V_DN, is an inversion of V_UP, but with twice the slope and offset by a fixed amount. This output starts at about 2.25 V (provided the supply voltage is ≥3.3 V) for the minimum input and falls to a value close to ground at the maximum input. This output is intended for analog control loop applications. A setpoint voltage is applied to VSET and V_DN is then used to control a VGA or power amplifier. Here again, an external filter capacitor may be added to extend the averaging time. Consult the Applications section of this data sheet for information on use in this mode. The AD8314 is available in a micro_SOIC package and con- sumes 4.5 mA from a 2.7 V to 5.5 V supply. When powered down, the typical sleep current is 20 µA. FUNCTIONAL BLOCK DIAGRAM 10dB OFFSET COMP'N V-I I-V RFIN COMM (PADDLE) VPOS X2 ENBL V DN V UP VSET FLTR AD8314 10dB 10dB 10dB BAND-GAP REFERENCE DET DET DET DET DET |
Аналогичный номер детали - AD8314ARM-REEL7 |
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Аналогичное описание - AD8314ARM-REEL7 |
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