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ADF7901BRU-REEL7 Datasheet(PDF) 1 Page - Analog Devices |
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ADF7901BRU-REEL7 Datasheet(HTML) 1 Page - Analog Devices |
1 / 12 page High Performance ISM Band OOK/FSK Transmitter IC ADF7901 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. FEATURES Single-chip, low power UHF transmitter 369.5 MHz to 395.9 MHz frequency operation using fractional-N PLL and fully integrated VCO 3.0 V supply voltage Data rates up to 50 kbps supported Low current consumption 26 mA at 12 dBm output at 384 MHz Power-down mode (<1 μA) 24-lead TSSOP GENERAL DESCRIPTION The ADF7901 is a low power OOK/FSK UHF transmitter designed for use in RF remote control devices. It is capable of frequency shift keying (FSK) modulation on eight different channels, selectable by three external control lines. OOK modulation is performed by modulating the PA control line. The on-chip VCO operates at 2× the output frequency. The division by 2 at the output of the VCO reduces the amount of PA feedthrough. As a result, OOK modulation depths of greater than 50 dB are easily achievable. The FSK_ADJ and ASK_ADJ resistors can be adjusted in the system to optimize output power for each modulation scheme. An additional 1.5 dB of output power is provided for the lower bank of channels to adjust for antenna performance. The CE line allows the transmitter to be powered down completely. In this mode, the leakage current is typically 0.1 μA. FUNCTIONAL BLOCK DIAGRAM R = 1 FSK DVDD TXDATA CE DGND FSK1 OOK_SEL RFOUT RFGND VDD RSET OSC2 CVCO CREG2 PA_EN RSET_FSK RSET_OOK OSC1 PA CREG2 CREG1 LDO REGULATOR 1 LDO REGULATOR 2 PDF CHARGE PUMP ⎟ FRACTIONAL N Σ-Δ FSK2 FSK3 CHANNEL SELECT VCO Figure 1. |
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