100 MHz to 1000 MHz Integrated Broadband Receiver ADRF6850 FEATURES GENERAL DESCRIPTION IQ quadrature demodulator The ADRF6850 is a highly integrated broadband quadrature Integrated fractional-N PLL and VCO demodulator, frequency synthesizer, and variable gain amplifier Gain control range: 60 dB (VGA). The device covers an operating frequency range from Input frequency range: 100 MHz to 1000 MHz 100 MHz to 1000 MHz for use in both narrow-band and wideband Input P1dB: +12 dBm at 0 dB gain communications applications, performing quadrature demodu- Input IP3: +22.5 dBm at 0 dB gain lation from IF directly to baseband frequencies. Noise figure: 11 dB at >39 dB gain, 49 dB at 0 dB gain The ADRF6850 demodulator includes a high modulus Baseband 1 dB bandwidth: 250 MHz in wideband mode, fractional-N frequency synthesizer with integrated VCO, 50 MHz in narrow-band mode providing better than 1 Hz frequency resolution, and a 60 dB 2 SPI/I C serial interface gain control range provided by a front-end VGA. Power supply: +3.3 V/350 mA Control of all the on-chip registers is through a user-selected APPLICATIONS 2 SPI interface or I C interface. The device operates from a single Broadband communications power supply ranging from 3.15 V to 3.45 V. Cellular communications Satellite communications FUNCTIONAL BLOCK DIAGRAM VCC1 VCC2 VCC3 VCC4 VCC5 VCC6 VCC7 VCC8 VCC9 LOMON LOMON IBB IBB CCOMP1 60dB GAIN CONTROL CCOMP2 RANGE CCOMP3 RFI DRIVER RFDIV 0/90 RFI VCO VTUNE CORE RFCM VOCM SEQUENCED QBB VGAIN GAIN INTERFACE QBB R SET REFERENCE 2 5-BIT REFIN 2 + DOUBLER DIVIDER PHASE CHARGE FREQUENCY CP PUMP DETECTOR LF3 CURRENT SETTING N-COUNTER LF2 THIRD-ORDER LDET SDI/SDA RFCP4 RFCP3 RFCP2 RFCP1 FRACTIONAL TESTLO SPI/ INTERPOLATOR CLK/SCL 2 I C TESTLO INTERFACE SDO CS FRACTIONAL MODULUS INTEGER 25 REGISTER 2 REGISTER ADRF6850 GND MUXOUT Figure 1. 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 www.analog.com 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 owners. Fax: 781.461.3113 2010 Analog Devices, Inc. All rights reserved. 09316-001ADRF6850 TABLE OF CONTENTS 2 Features .............................................................................................. 1 I C Interface ................................................................................ 20 Applications ....................................................................................... 1 SPI Interface ................................................................................ 22 General Description ......................................................................... 1 Program Modes .......................................................................... 24 Functional Block Diagram .............................................................. 1 Register Map ................................................................................... 26 Revision History ............................................................................... 2 Register Map Summary ............................................................. 26 Specifications ..................................................................................... 3 Register Bit Descriptions ........................................................... 27 Timing Characteristics ................................................................ 5 Suggested Power-Up Sequence ..................................................... 30 Absolute Maximum Ratings ............................................................ 7 Initial Register Write Sequence ................................................ 30 ESD Caution .................................................................................. 7 Evaluation Board ............................................................................ 31 Pin Configuration and Function Descriptions ............................. 8 General Description ................................................................... 31 Typical Performance Characteristics ........................................... 10 Hardware Description ............................................................... 31 Theory of Operation ...................................................................... 18 PCB Schematic............................................................................ 33 Overview ...................................................................................... 18 PCB Artwork............................................................................... 34 PLL Synthesizer and VCO ......................................................... 18 Bill of Materials ........................................................................... 35 Quadrature Demodulator.......................................................... 20 Outline Dimensions ....................................................................... 36 Variable Gain Amplifier (VGA) ............................................... 20 Ordering Guide .......................................................................... 36 REVISION HISTORY 10/10Revision 0: Initial Version Rev. 0 Page 2 of 36