PDF RF2945 Data sheet ( Hoja de datos )

Número de pieza	RF2945
Descripción	433/868/915MHZ FSK/ASK/OOK TRANSCEIVER
Fabricantes	RF Micro Devices
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No Preview Available ! RF2945 11 433/868/915MHZ FSK/ASK/OOK TRANSCEIVER Typical Applications • Wireless Meter Reading • Wireless Data Transceiver • Keyless Entry Systems • Wireless Security Systems • 433, 868 and 915MHz ISM Band Systems • Battery-Powered Portable Devices Product Description The RF2945 is a monolithic integrated circuit intended for use as a low cost FM transceiver. The device is provided in 32-lead plastic LQFP packaging and is designed to be used with a PLL IC to provide a fully functional FM trans- ceiver. The chip is intended for digital (ASK, FSK, OOK) applications in the North American 915MHz ISM band and European 433/868MHz ISM bands. The integrated VCO has a buffered output to feed the RF signal back to the PLL IC to form the frequency synthesizer. Internal decoding of the RX ENABL and TX ENABL lines allow for half duplex operation as well as turning on the VCO to give the synthesizer time to settle and complete power downmode. The DATA REF line allows the use of an external capacitor to control the DC level at the adaptive Data Slicer input for setting the bit decision threshold. Optimum Technology Matching® Applied üSi BJT GaAs HBT GaAs MESFET Si Bi-CMOS SiGe HBT Si CMOS 32 31 30 29 28 27 26 25 TX ENABL 1 TX OUT 2 Control Logic PA Gain Control GND2 3 RX IN 4 GND1 5 LNA OUT 6 LNA GND3 7 MIX IN 8 Linear RSSI 9 10 11 12 13 14 15 16 24 RESNTR- 23 MOD IN 22 DATA REF 21 DEMOD IN 20 GND6 19 IF2 BP- 18 IF2 BP+ 17 IF2 IN Functional Block Diagram 7.00 + 0.20 sq. 0.22 + 0.05 -A- 0.15 0.05 0.50 5.00 + 0.10 sq. 7° MAX 0° MIN 1.40 + 0.05 Dimensions in mm. 0.60 + 0.15 0.10 0.127 Package Style: LQFP-32_5x5 Features • Fully Monolithic Integrated Transceiver • 2.4V to 5.0V Supply Voltage • Narrowband and Wideband FSK • 300MHz to 1000MHz Frequency Range • 10dB Cascaded Noise Figure • 10mW Output Power With Power Control Ordering Information RF2945 433/868/915MHz FSK/ASK/OOK Transceiver RF2945 PCBA-L Fully Assembled Evaluation Board (433MHZ) RF2945 PCBA-M Fully Assembled Evaluation Board (868MHZ) RF2945 PCBA-H Fully Assembled Evaluation Board (915MHz) RF Micro Devices, Inc. 7628 Thorndike Road Greensboro, NC 27409, USA Tel (336) 664 1233 Fax (336) 664 0454 http://www.rfmd.com 11 Rev A10 000919 11-215 1 page RF2945 Pin Function Description Interface Schematic 1 TX ENABL Enables the transmitter circuits. TX ENABL>2.0V powers up all trans- mitter functions. TX ENABL<1.0V turns off all transmitter functions except the PLL functions. TX ENABL 20 kΩ 40 kΩ 2 TX OUT RF output pin for the transmitter electronics. TX OUT output impedance is a low impedance when the transmitter is enabled. TX OUT is a high impedance when the transmitter is disabled. 3 GND2 Ground connection for the 40 dB IF limiting amplifier and Tx PA func- tions. Keep traces physically short and connect immediately to ground plane for best performance. 4 RX IN RF input pin for the receiver electronics. RX IN input impedance is a low impedance when the transmitter is enabled. RX IN is a high imped- ance when the receiver is disabled. VCC 20 TX OUT RX IN 500 5 GND1 Ground connection for RF receiver functions. Keep traces physically short and connect immediately to ground plane for best performance. 6 LNA OUT Output pin for the receiver RF low noise amplifier. This pin is an open collector output and requires an external pull up coil to provide bias and tune the LNA output. A capacitor in series with this output can be used to match the LNA to 50Ω impedance image filters. 7 GND3 Same as pin 3. 8 MIX IN RF input to the RF Mixer. An LC matching network between LNA OUT and MIX IN can be used to connect the LNA output to the RF mixer input in applications where an image filter is not needed or desired. VCC MIX IN LNA OUT GND5 9 GND5 GND5 is the ground connection shared by the input stage of the trans- mit power amplifier and the receiver RF mixer. 10 MIX OUT IF output from the RF mixer. Interfaces directly to 10.7MHz ceramic IF MIX OUT filters as shown in the application schematic. A pull-up inductor and series matching capacitor should be used to present a 330Ω termina- tion impedance to the ceramic filter. Alternately, an IF tank can be used to tailor the IF frequency and bandwidth to meet the needs of a given 15 pF 15 pF application. GND5 GND5 11 VREF IF DC voltage reference for the IF limiting amplifiers. A 10nF capacitor . from this pin to ground is required. 12 RSSI A DC voltage proportional to the received signal strength is output from this pin. The output voltage range is 0.5V to 2.3V and increases with increasing signal strength. VCC RSSI 13 IF1 IN IF input to the 40dB limiting amplifier strip. A 10nF DC blocking capaci- tor is required on this input. IF1 BP+ 60 kΩ IF1 BP- 60 kΩ 330 IF1 IN 330 11 Rev A10 000919 11-219 5 Page Pin Out RF2945 32 31 30 29 28 27 26 25 TX ENABL 1 24 RESNTR+ TX OUT 2 23 MOD IN GND2 3 22 DATA REF RX IN 4 21 DEMOD IN GND1 5 20 GND6 LNA OUT 6 19 IF2 BP- GND3 7 18 IF2 BP+ MIX IN 8 17 IF2 IN 9 10 11 12 13 14 15 16 11 Rev A10 000919 11-225 11 Page

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