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AD7021 Dataheets PDF



Part Number AD7021
Manufacturers Analog Devices
Logo Analog Devices
Description High Performance Narrowband ISM Transceiver IC
Datasheet AD7021 DatasheetAD7021 Datasheet (PDF)

www.DataSheet4U.com Preliminary Technical Data FEATURES Low power, low IF transceiver Frequency bands 80 MHz to 650 MHz 862 MHz to 940 MHz Modulation schemes 2FSK, 3FSK, 4FSK Spectral shaping Gaussian and raised-cosine filtering Data rates supported 0.05 kbps to 25 kbps 2.3 V to 3.6 V power supply Programmable output power −16 dBm to +13 dBm in 63 steps Automatic PA ramp control Receiver sensitivity −125 dBm at 1 kbps, 2 FSK On-chip VCO and fractional-N PLL High Performance Narrowband ISM Tran.

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www.DataSheet4U.com Preliminary Technical Data FEATURES Low power, low IF transceiver Frequency bands 80 MHz to 650 MHz 862 MHz to 940 MHz Modulation schemes 2FSK, 3FSK, 4FSK Spectral shaping Gaussian and raised-cosine filtering Data rates supported 0.05 kbps to 25 kbps 2.3 V to 3.6 V power supply Programmable output power −16 dBm to +13 dBm in 63 steps Automatic PA ramp control Receiver sensitivity −125 dBm at 1 kbps, 2 FSK On-chip VCO and fractional-N PLL High Performance Narrowband ISM Transceiver IC ADF7021 On-chip 7-bit ADC and temperature sensor Fully automatic frequency control loop (AFC) Digital RSSI Integrated Tx/Rx switch Leakage current <1 μA in power-down mode APPLICATIONS Narrow-band standards ETSI EN 300-220, FCC Part 90, FCC Part 15, FCC Part 95, ARIB STD-T67 Low cost, wireless data transfer Remote control/security systems Wireless metering Private mobile radio Wireless medical telemetry service (WMTS) Keyless entry Home automation Process and building control Pagers FUNCTIONAL BLOCK DIAGRAM RSET TEMP SENSOR CE CREG(1:4) MUXOUT MUX 7-BIT ADC RLNA POLARIZATION LDO(1:4) TEST MUX LNA RFIN RFINB GAIN IF FILTER RSSI/ OFFSET CORRECTION 2FSK 3FSK 4FSK DEMODULATOR CLOCK AND DATA RECOVERY DATA CLK | TxDATA Tx/Rx CONTROL DATA I/O | RxDATA SWD AGC CONTROL SERIAL PORT SLE SDATA SREAD SCLK PA RAMP AFC CONTROL RFOUT DIVIDERS/ MUXING DIV P N/N + 1 Σ-Δ MODULATOR 2FSK 3FSK 4FSK MOD CONTROL GAUSSIAN/ RAISED COSINE FILTER VCO MUX CP PFD DIV R RING OSC CLK DIV 3FSK ENCODING L1 L2 VCOIN CPOUT OSC1 OSC2 CLKOUT Figure 1. Rev. PrI 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. Specifications subject to change without notice. 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 owners. 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 ©2006 Analog Devices, Inc. All rights reserved. DataSheet 4 U .com 05876-001 www.DataSheet4U.com ADF7021 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 3 Specifications..................................................................................... 4 Timing Characteristics..................................................................... 7 Absolute Maximum Ratings............................................................ 9 ESD Caution.................................................................................. 9 Pin Configuration and Function Descriptions........................... 10 Frequency Synthesizer ................................................................... 12 Reference Input........................................................................... 12 MUXOUT.................................................................................... 13 Voltage Controlled Oscillator (VCO) ...................................... 14 Choosing Channels for Best System Performance................. 14 Transmitter ...................................................................................... 15 RF Output Stage.......................................................................... 15 Modulation Schemes.................................................................. 15 Spectral Shaping ......................................................................... 17 Modulation and Filtering Options ........................................... 17 Receiver Section.............................................................................. 18 RF Front End............................................................................... 18 RSSI/AGC.................................................................................... 19 FSK Demodulators on the ADF7021....................................... 19 FSK Correlator/Demodulator................................................... 19 Linear 2FSK Demodulator ........................................................ 21 3FSK Demodulator..................................................................... 21 4FSK Demodulator..................................................................... 21 Preliminary Technical Data AFC Section ................................................................................ 21 Automatic Sync Word Recognition ......................................... 22 Applications........................................


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