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1 / 28 page Multichannel ISM Band FSK/GFSK/OOK/GOOK/ASK Transmitter ADF7012 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 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: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved. FEATURES Single-chip, low power UHF transmitter 75 MHz to 1 GHz frequency operation Multichannel operation using Frac-N PLL 2.3 V to 3.6 V operation On-board regulator—stable performance Programmable output power: −16 dBm to +14 dBm, 0.4 dB steps Data rates: dc to 179.2 kbps Low current consumption: 868 MHz, 10 dBm, 21 mA 433 MHz, 10 dBm, 17 mA 315 MHz, 0 dBm, 10 mA Programmable low battery voltage indicator 24-lead TSSOP APPLICATIONS Low cost wireless data transfer Security systems RF remote controls Wireless metering Secure keyless entry GENERAL DESCRIPTION The ADF7012 is a low power FSK/GFSK/OOK/GOOK/ASK UHF transmitter designed for short range devices (SRDs). The output power, output channels, deviation frequency, and mod- ulation type are programmable by using four, 32-bit registers. The fractional-N PLL and VCO with external inductor enable the user to select any frequency in the 75 MHz to 1 GHz band. The fast lock times of the fractional-N PLL make the ADF7012 suitable in fast frequency hopping systems. The fine frequency deviations available and PLL phase noise performance facilitates narrow-band operation. There are five selectable modulation schemes: binary frequency shift keying (FSK), Gaussian frequency shift keying (GFSK), binary on-off keying (OOK), Gaussian on-off keying (GOOK), and amplitude shift keying (ASK). In the compensation register, the output can be moved in <1 ppm steps so that indirect com- pensation for frequency error in the crystal reference can be made. A simple 3-wire interface controls the registers. In power-down, the part has a typical quiescent current of <0.1 μA. FUNCTIONAL BLOCK DIAGRAM SERIAL INTERFACE FREQUENCY COMPENSATION CENTER FREQUENCY OSC1 OSC2 L1 L2 CVCO CLKOUT CPVDD CPGND CREG PRINTED INDUCTOR AGND CE LE DATA CLK TxDATA TxCLK MUXOUT RF GND RSET RFOUT CREG VDD DGND DVDD FSK\GFSK OOK\ASK OOK\ASK ÷CLK ÷R PFD/ CHARGE PUMP Σ-∆ +FRACTIONAL N VCO PLL LOCK DETECT MUXOUT LDO REGULATOR BATTERY MONITOR PA Figure 1. |
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