ADF7025BCPZ

High Performance ISM Band Transceiver IC ADF7025 FEATURES Low power, zero-IF RF transceiver Frequency bands 431 MHz to 464 MHz 862 MHz to 870 MHz 902 MHz to 928 MHz Data rates supported 9.6 kbps to 384 kbps, FSK 2.3 V to 3.6 V power supply Programmable output power −16 dBm to +13 dBm in 63 steps Receiver sensitivity −104.2 dBm at 38.4 kbps, FSK −100 dBm at 172.8 kbps, FSK −95.8 dBm at 384 kbps, FSK Low power consumption 19 mA in receive mode 28 mA in transmit mode (10 dBm output) On-chip VCO and Fractional-N PLL On-chip, 7-bit ADC and temperature sensor Digital RSSI Integrated TRx switch Leakage current < 1 µA in power-down mode APPLICATIONS Wireless audio/video Remote control/security systems Wireless metering Keyless entry Home automation FUNCTIONAL BLOCK DIAGRAM RSET CREG(1:4) ADCIN MUXOUT RLNA BIAS LDO(1:4) OFFSET CORRECTION TEMP SENSOR TEST MUX LNA RFIN RFINB GAIN OFFSET CORRECTION LP FILTER RSSI MUX 7-BIT ADC FSK DEMODULATOR DATA SYNCHRONIZER CE AGC CONTROL Σ-∆ MODULATOR DATA CLK Tx/Rx CONTROL DATA I/O FSK MOD CONTROL INT/LOCK DIVIDERS/ MUXING RFOUT DIV P N/N+1 SLE SERIAL PORT SDATA SREAD SCLK DIV R RING O SC CLK DIV 05542-001 VCO CP PFD VCOIN CPOUT OSC1 OSC2 CLKOUT Figure 1. Rev. A 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. ADF7025 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 General Description ......................................................................... 3 Specifications..................................................................................... 4 Timing Characteristics..................................................................... 7 Timing Diagrams.......................................................................... 7 Absolute Maximum Ratings............................................................ 9 ESD Caution .................................................................................. 9 Pin Configuration and Function Descriptions ........................... 10 Typical Performance Characteristics ........................................... 12 Frequency Synthesizer ................................................................... 15 Reference Input Section ............................................................. 15 Choosing Channels for Best System Performance ................. 17 Transmitter ...................................................................................... 18 RF Output Stage .......................................................................... 18 Modulation Scheme ................................................................... 18 Receiver ............................................................................................ 19 RF Front End ............................................................................... 19 RSSI/AGC .................................................................................... 20 FSK Demodulators on the ADF7025 ....................................... 20 FSK Correlator/Demodulator ................................................... 20 Linear FSK Demodulator .......................................................... 22 Automatic Sync Word Recognition ......................................... 22 Applications Section....................................................................... 23 LNA/PA Matching ...................................................................... 23 Transmit Protocol and Coding Considerations ..................... 24 Device Programming after Initial Power-Up ............................. 24 Interfacing to Microcontroller/DSP ........................................ 24 Serial Interface ................................................................................ 27 Readback Format........................................................................ 27 Registers ........................................................................................... 28 Register 0—N Register............................................................... 28 Register 1—Oscillator/Filter Register ...................................... 29 Register 2—Transmit Modulation Register ............................ 30 Register 3—Receiver Clock Register ....................................... 31 Register 4—Demodulator Setup Register ............................... 32 Register 5—Sync Byte Register ................................................. 33 Register 6—Correlator/Demodulator Register ...................... 34 Register 7—Readback Setup Register ...................................... 35 Register 8—Power-Down Test Register .................................. 36 Register 9—AGC Register ......................................................... 37 Register 10—AGC 2 Register .................................................... 38 Register 12—Test Register ......................................................... 39 Register 13—Offset Removal and Signal Gain Register ....... 40 Outline Dimensions ....................................................................... 41 Ordering Guide .......................................................................... 41 REVISION HISTORY 2/06—Rev. 0 to Rev. A Replaced Figure 40 ................................................................ Page 29 1/06—Revision 0: Initial Version Rev. A | Page 2 of 44 ADF7025 GENERAL DESCRIPTION The ADF7025 is a low power, highly integrated FSK transceiver. It is designed for operation in the license–free ISM bands of 433 MHz, 863 MHz to 870 MHz, and 902 MHz to 928 MHz. The ADF7025 can be used for applications operating under the European ETSI EN300-220 or the North American FCC (Part 15) regulatory standards. The ADF7025 is intended for wideband, high data rate applications with deviation frequencies from 100 kHz to 750 kHz and data rates from 9.6 kbps to 384 kbps. A complete transceiver can be built using a small number of external discrete components, making the ADF7025 very suitable for price-sensitive and area-sensitive applications. The transmit section contains a VCO and low noise Fractional-N PLL with output resolution of