RF2926 11 UHF DUAL CONVERSION TRANSCEIVER Typical Applications • Wireless Meter Reading • Wireless Data Transceiver • Keyless Entry Systems • Wireless Security Systems • 433/868/915MHz ISM Band Systems • Battery Powered Portable Devices Product Description .362 .346 .020 .362 .346 UP CONV Si CMOS LO- SiGe HBT LO+ Si Bi-CMOS PA INP GaAs MESFET LVL ADJ ü GaAs HBT 46 44 37 36 39 2 RX IN 4 LNA OUT 8 MIX CA 43 MIX IN 10 .011 .007 .057 .053 7°MAX 0°MIN .031 .021 .007 MAX Package Style: LQFP-48 11 Features • Monolithic Integrated Transceiver • 2.7V to 5.0V Supply Voltage Gain Control TX OUT .280 .272 .280 .272 Optimum Technology Matching® Applied Si BJT .006 .002 35 VCO OUT 34 MOD IN 31 RESNTR- 30 RESNTR+ 28 DEMOD IN 26 FM OUT 27 DATA REF • Narrow Band and Wide Band FM/FSK • 300MHz to 1000MHz Frequency Range • 130MHz Bandwidth in First IF • 5mW Output Power at 433MHz 25 20 RSSI VREF IF 21 22 23 24 ATA OUT 18 IF2 BP- 16 IF2 IN 14 IF2 BP+ 15 IF1 BP- 13 IF1 OUT 12 MIX OUT- IF1 IN MIX OUT+ IF1 BP+ RSSI Functional Block Diagram Rev A5 010404 Ordering Information RF2926 RF2926 PCBA UHF Dual Conversion Transceiver Fully Assembled Evaluation Board RF Micro Devices, Inc. 7625 Thorndike Road Greensboro, NC 27409, USA Tel (336) 664 1233 Fax (336) 664 0454 http://www.rfmd.com 11-185 TRANSCEIVERS The RF2926 is a monolithic integrated circuit intended for use as a low cost FM transceiver. The device is provided in 48-lead plastic TQFP packaging and is designed to provide a dual conversion, half-duplex transceiver. The chip is intended for linear (AM, FM) or digital (ASK, FSK, OOK) applications in the North American 915MHz 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. Separate RX ENABL, TX ENABL, and PLL 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. RF2926 Absolute Maximum Ratings Parameter Ratings Unit Supply Voltage Control Voltages Input RF Level Output Load VSWR Operating Ambient Temperature Storage Temperature -0.5 to +5.5 -0.5 to +5.0 +10 50:1 -40 to +85 -40 to +150 VDC VDC dBm Parameter °C °C Caution! ESD sensitive device. RF Micro Devices believes the furnished information is correct and accurate at the time of this printing. However, RF Micro Devices reserves the right to make changes to its products without notice. RF Micro Devices does not assume responsibility for the use of the described product(s). Specification Min. Typ. Max. Unit 300 to 1000 MHz 300 to 1000 -18 50 MHz dBm Ω Condition T=25 °C, VCC =3.6V, Freq=433MHz Overall RF Frequency Range VCO VCO Frequency Range VCO OUT Level VCO OUT Impedance 50Ω load impedance Transmit Section Max Modulation Frequency Min Modulation Frequency Maximum Power Level Power Control Range Power Control Sensitivity Max FM Deviation TRANSCEIVERS 11 Antenna Port Impedance Antenna Port Impedance Antenna Port VSWR Modulation Input Impedance Harmonics 2 MHz Set by loop filter bandwidth +2 20 TBD 200 dBm dB dB/V kHz Ω Ω 50 TBD 1.5:1 4 -50 Spurious kΩ dBm TBD dBc 300 to 1000 -99 0.7 to 2.2 25 80 MHz dBm V mV/dB dB 18 7 -18.5 dB dB dBm dBm Freq=433MHz See plot Instantaneous frequency deviation is inversely proportional with the modulation voltage TX ENABL=“1” TX ENABL=“0” TX Mode Measured on eval board with RF filters in system. Overall Receive Section Frequency Range RX Sensitivity RSSI DC Output Range RSSI Sensitivity RSSI Dynamic Range 70 IF BW =400kHz, Freq=915MHz, S/N=8dB RLOAD =51kΩ See plot LNA and Mixer Cascaded Gain Cascaded Noise Figure Cascaded Input IP3 LO Leakage -70 Freq=915MHz; RX current 12mA Freq=915MHz; RX current 12mA Freq=915MHz; RX current 12mA First IF Section IF 3dB Bandwidth Voltage Gain Noise Figure Input IP3 IF1 Input Impedance IF1 Output Impedance 11-186 130 34 13 TBD 330 330 MHz dB dB mVPP Ω Ω IF=110.6MHz, ZL =330Ω Rev A5 010404 RF2926 Parameter Specification Min. Typ. Max. Unit Condition Second IF Section IF Frequency Range Voltage Gain IF2 Input Impedance IF2 Output Impedance Demod Input Impedance FM Output Impedance Data Output Impedance FM Output Bandwidth Data Output Bandwidth Data Output Level 0.1 10.7 60 330 1 10 500 >1 1.6 1.4 0.3 22 VCC -0.3 MHz dB Ω kΩ kΩ Ω MΩ MHz MHz V FM Output DC Level 2.6 V FM Output AC Level 200 mVPP IF=10.7MHz At IF2 OUT pin ZLOAD=1MΩ || 3pF; Output voltage is proportional with the instantaneous frequency deviation. ZLOAD>10kΩ ZLOAD>10kΩ Power Down Control Logical Controls “ON” Logical Controls “OFF” Control Input Impedance 2.0 1.0 25k V V Ω Voltage supplied to the input Voltage supplied to the input Power Supply Voltage Current Consumption 3.6 2.7 to 5.0 37.3 10.9 10 to 18 1 3.8 V V mA mA mA µA mA Specifications Operating limits TX Mode, LVL ADJ=3.6V TX Mode, LVL ADJ=0V RX Mode; Current is adjustable Power Down Mode PLL Only Mode TRANSCEIVERS 11 Rev A5 010404 11-187 RF2926 Pin 1 2 Function TX ENABL TX OUT Description Enables the transmitter circuits. TX ENABL>2.0V powers up all transmitter functions. TX ENABL<1.0V turns off all transmitter functions except the PLL functions. Interface Schematic 20 kΩ TX ENABL 40 kΩ RF output pin for the transmitter electronics. TX OUT output impedance is a low impedance (see output impedance plot in Figure TBD) when the transmitter is enabled. TX OUT is a high impedance when the transmitter is disabled. VCC 20 TX OUT TRANSCEIVERS 11 3 GND2 4 RX IN 5 GND1 6 7 8 LNA GND LNA GND LNA OUT 9 10 GND3 MIX IN 11 GND5 12 MIX OUT+ Ground connection for the 40 dB IF limiting amplifier and Tx PA functions. Keep traces physically short and connect immediately to ground plane for best performance. RF input pin for the receiver electronics. RX IN input impedance is a low impedance (see input impedance plot in Figure TBD) when the receiver is enabled. RX IN is a high impedance when the receiver is disabled. RX IN 500 Ground connection for RF receiver functions. Keep traces physically short and connect immediately to ground plane for best performance. Ground connection for the LNA. Ground connection for the LNA. 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. Same as pin 4. 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. GND5 is the ground connection shared by the input stage of the transmit power amplifier and the receiver RF mixer. Complementary (with respect to pin 13) IF output from the RF mixer. Alternately, an IF tank can be used to tailor the IF frequency and bandwidth to meet the needs of a given application. VCC LNA OUT MIX IN GND5 MIX OUT+ MIX OUT- 15 pF GND5 13 MIX OUT- 14 IF1 BP+ 15 IF1 IN IF output from the RF mixer. For a balanced mixer output, pull-up induc- See pin 12. tors from pin 12 and 13 to VCC and a capacitor between the pins should be used. The sum of the total pull-up inductance should be used to resonate the capacitor between pins 12 and 13. DC feedback node for the 40dB limiting amplifier strip. A 10nF bypass See pin 16. capacitor from this pin to ground is required. IF input to the 40dB limiting amplifier strip. A DC blocking capacitor is IF1 BP+ required on this input. The value of this capacitor should be small 60 kΩ enough as to not attenuate the IF frequency when terminated into the 330Ω input impedance. 330 15 pF GND5 IF1 BP60 kΩ 330 IF1 IN+ 11-188 Rev A5 010404 RF2926 Pin 16 17 Function IF1 BPGND7 18 IF1 OUT 19 GND6 20 VREF IF 21 IF2 IN Description Interface Schematic See pin 14. See pin 15. Ground connection for 40dB IF limiting amplifier. Keep traces physically short and connect immediately to ground plane for best performance. IF output from the 40dB limiting amplifier. The IF1 OUT output presents a nominal 330 Ω output resistance and interfaces directly to 10.7MHz ceramic filters. IF1 OUT Ground connection for 60dB IF limiting amplifier. Keep traces physically short and connect immediately to ground plane for best performance. DC voltage reference for the IF limiting amplifiers. A 10nF capacitor from this pin to ground is required. IF input to the 60dB limiting amplifier strip. A 10nF DC blocking capacitor is required on this input. The IF2 IN input presents a nominal 330 Ω input resistance and interfaces directly to 10.7MHz ceramic filters. IF2 BP+ 60 kΩ IF2 BP60 kΩ 330 330 IF2 IN 22 IF2 BP+ 23 24 IF2 BPDATA OUT 25 RSSI DC feedback node for the 60dB limiting amplifier strip. A 10nF bypass capacitor from this pin to ground is required. See pin 21. See pin 20. See pin 20. Demodulated data output from the demodulator. Output levels on this are TTL/CMOS compatible. The magnitude of the load impedance is intended to be 1MΩ or greater. DATA OUT A DC voltage proportional to the received signal strength is output from this pin. The output voltage range is 0.5V to 2.5V and increases with increasing signal strength. VCC RSSI FM OUT Linear output from the FM demodulator. This pin is used in analog applications when signal fidelity is important. TRANSCEIVERS 26 FM OUT 27 DATA REF This pin is used for setting the adaptive Data Slicer DC reference level. A capacitor from this pin to ground can be used to set the reference level at the average DC level of the data bit stream.The DC level determines the bit decision threshold. 28 DEMOD IN This pin is the input to the FM demodulator. This pin is NOT AC coupled. Therefore, a DC blocking capacitor is required on this pin to avoid shorting the demodulator input with the LC tank. A ceramic discriminator or DC blocked LC tank resonant at the IF should be connected to this pin. 50 kΩ DATA REF VCC IF Output VCC 10 kΩ DEMOD IN 29 VCC4 Rev A5 010404 11 This pin is used is supply DC bias to the 60dB IF limiting amplifier. An IF bypass capacitor should be connected directly to this pin and returned to ground. A 10nF capacitor is recommended for 10.7MHz IF applications. 11-189 RF2926 Pin 30 Function RESNTR+ Description This port is used to supply DC voltage to the VCO as well as to tune the center frequency of the VCO. Equal value inductors should be connected to this pin and pin 31 although a small imbalance can be used to tune in the proper frequency range. Interface Schematic RESNTR+ RESNTR- 4 kΩ MOD IN 31 32 RESNTRVCC2 33 GND4 34 MOD IN 35 VCO OUT See RESNTR+ description. See pin 30. This pin is used is supply DC bias to the VCO and buffer amps. A 10nF capacitor is recommended for 10.7MHz IF applications. GND4 is the ground shared on chip by the VCO, prescaler, and PLL electronics. FM analog or digital modulation can be imparted to the VCO through See pin 30. this pin. The VCO varies in accordance to the voltage level presented to this pin. To set the deviation to a desired level, a voltage divider referenced to VCC is the recommended. This deviation is also dependent upon the overall capacitance of the external resonant circuit. This pin is used is supply a buffered VCO output to go to the PLL chip. This pin has a DC bias and needs to be AC coupled. VCO OUT TRANSCEIVERS 11 36 LO- 37 38 LO+ GND8 39 UP CONV 40 41 GND9 VCC1 42 MUTE Balanced input for the first LO. This signal is presented to both the receiver second downconverter and transmit upconvertor. LO- Complementary input of LO-. See pin 36. Ground for LO amp and transmit upconvertor. Keep traces physically short and immediately to the ground plane for best performance. The output of the transmit signal upconvertor. This signal should be filtered to remove the undesired sideband and spurs before being applied to the PA input, pin 45. Same as pin 38. See pin 38. This pin is used to supply DC bias to the receiver RF electronics. A RF bypass capacitor should be connected directly to this pin and returned to ground. A 100pF capacitor is recommended for 915MHz applications. A 220pF capacitor is recommended for 433MHz applications. This pin is used to mute the data output (DATA OUT). MUTE>2.0V turns the DATA OUT signal on. MUTE<1.0V turns the DATA OUT signal off. The MUTE signal should be logic low in the Sleep Mode. LO+ 75 kΩ MUTE 25 kΩ 43 MIX CA 44 45 PA INP VCC3 11-190 Mixer Current Adjust. This pin is used to adjust the current in the receiver. A resistor connected to ground controls the bias current in the mixer. The resistor should vary between 1kΩ to open circuit to vary the current from 18mA to 10.6mA Input of the transmit power amplifier. This pin is used to supply DC bias to the transmitter PA. A RF bypass capacitor should be connected directly to this pin and returned to ground. A 100pF capacitor is recommended for 915MHz applications. A 220pF capacitor is recommended for 433MHz applications. Rev A5 010404 RF2926 Pin 46 Function LVL ADJ Description Interface Schematic This pin is used to vary the transmitter output power. An output level adjustment range greater than 12dB is provided through analog voltage control of this pin. DC current of the transmitter power amp is also reduced with output power. This pin MUST be low when the transmitter is disabled. 40 kΩ LVL ADJ 400 47 48 PLL ENABL RX ENABL This pin is used to power up or down the VCO and PLL. A logic high (PLL ENABL>2.0V) powers up the VCO and PLL electronics. A logic low (PLL ENABL<1.0V) powers down the PLL and VCO. 4 kΩ 50 kΩ PLL ENABL Enable pin for the receiver circuits. RX ENABL>2.0V powers up all receiver functions. RX ENABL<1.0V turns off all receiver functions except the PLL functions and the RF mixer. 50 kΩ RX ENABL RX ENABL PLL ENABL LVL ADJ VCC3 PA INPUT MIX CA MUTE VCC1 GND9 UP CONV GND8 LO+ Pin Out 48 47 46 45 44 43 42 41 40 39 38 37 Gain Control TX ENABL 1 36 LO- TX OUT 2 35 VCO OUT 34 MODIN RX IN 4 33 GND4 GND1 5 32 VCC2 LNA GND 6 31 RESNTR- LNA GND 7 30 RESNTR+ LNA OUT 8 29 VCC4 GND3 9 28 DEMOD IN RSSI MIX IN 10 27 DATA REF GND5 11 26 FM OUT MIX OUT+ 12 Rev A5 010404 11 TRANSCEIVERS GND2 3 13 14 15 16 17 18 19 20 21 22 23 24 MIX OUT- IF1 BP+ IF1 IN IF1 BP- GND7 IF1 OUT GND6 VREF IF IF2 IN IF2 BP+ IF2 BP- DATA OUT 25 RSSI 11-191 11-192 MIX OUT MIX IN LNA OUT 10 Ω VCC VCC RF TX ENABL VCC 0.1 µF 4 pF 0.1 µF 10 Ω Filter 2 pF 22 pF 18 nH 22 pF 220 pF 4 pF 8.2 nH 2.7 kΩ 390 nH 5 pF 18 nH 5 pF 22 pF 6 pF 22 pF 22 pF 46 42 RSSI 43 20 41 21 40 22 39 23 38 24 37 34 35 36 5 pF Filter 22 nF 560 nH 13 12 11 22 nF 18 Filter 22 nF 19 22 nF 22 nF 28 9 25 26 27 29 8 10 30 7 31 17 44 6 16 45 1 nF 51 Ω 32 15 Gain Control 22 pF 0.1 µF 5 14 47 10 kΩ 22 pF 22 pF 33 48 22 pF Filter 4 3 2 1 0.1 µF 11 LVL ADJ PLL ENABL RX ENABL MUTE TRANSCEIVERS D1 2 pF 5 pF 10 Ω 47 kΩ FM Disc. 1.5 kΩ 4.7 nH 4.7 nH 22 pF 1 nF 10 pF 10 nF 10 kΩ 0.1 µF 10 Ω 22 pF 22 pF 10 Ω 0.1 µF 0.1 µF 10 Ω VCC DATA OUT RSSI FM OUT VCC LOOP FILTER VCC VCC VCO OUT MOD IN LO INPUT RF2926 Application Schematic 915MHz Rev A5 010404 RF2926 Evaluation Board Layout Board Size 3.04” x 3.04” Board Thickness 0.031”, Board Material FR-4 TRANSCEIVERS 11 Rev A5 010404 11-193 RF2926 TRANSCEIVERS 11 11-194 Rev A5 010404