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AD8345AREZ-RL7 Fiches technique(PDF) 1 Page - Analog Devices |
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AD8345AREZ-RL7 Fiches technique(HTML) 1 Page - Analog Devices |
1 / 20 page 140 MHz to 1000 MHz Quadrature Modulator AD8345 Rev. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 © 2005 Analog Devices, Inc. All rights reserved. FEATURES 140 MHz to 1000 MHz operating frequency +2.5 dBm P1dB @ 800 MHz −155 dBm/Hz noise floor 0.5 degree RMS phase error (IS95) 0.2 dB amplitude balance Single 2.7 V to 5.5 V supply Pin-compatible with AD8346 and AD8349 16-lead TSSOP_EP package APPLICATIONS Cellular communication systems W-CDMA/CDMA/GSM/PCS/ISM transceivers Fixed broadband access systems LMDS/MMDS Wireless LAN Wireless local loop Digital TV/CATV modulators Single sideband upconverter FUNCTIONAL BLOCK DIAGRAM 16 QBBP QBBN 15 COM3 14 COM3 13 VPS2 12 VOUT 11 COM2 10 COM3 9 1 IBBP 2 IBBN 3 COM3 4 COM1 5 LOIN 6 LOIP 7 VPS1 8 ENBL BIAS + PHASE SPLITTER AD8345 Figure 1. PRODUCT DESCRIPTION The AD8345 is a silicon RFIC quadrature modulator, designed for use from 140 MHz to 1000 MHz. Its excellent phase accuracy and amplitude balance enable the high performance direct modulation of an IF carrier. The AD8345 accurately splits the external LO signal into two quadrature components through the polyphase phase splitter network. The I and Q LO components are mixed with the baseband I and Q differential input signals. Finally, the outputs of the two mixers are combined in the output stage to provide a single-ended 50 Ω drive at VOUT. APPLICATIONS The AD8345 modulator can be used as the IF transmit modulator in digital communication systems such as GSM and PCS transceivers. It can also directly modulate an LO signal to produce QPSK and various QAM formats for 900 MHz communication systems as well as digital TV and CATV systems. Additionally, this quadrature modulator can be used with direct digital synthesizers in hybrid phase-locked loops to generate signals over a wide frequency range with millihertz resolution. The AD8345 modulator is supplied in a 16-lead TSSOP_EP package. Its performance is specified over a −40°C to +85°C temperature range. This device is fabricated on Analog Devices’ advanced silicon bipolar process. |
Numéro de pièce similaire - AD8345AREZ-RL7 |
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Description similaire - AD8345AREZ-RL7 |
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