RF2418 LOW CURRENT LNA/MIXER RoHS Compliant & Pb-Free Product Package Style: SOIC-14 LNA LNA IN 1 Features Single 3V to 6.5V Power Supply High Dynamic Range Low Current Drain High LO Isolation LNA Power Down Mode for Large Signals GND 2 13 GND VDD1 3 RF AMP VDD2 4 12 GND 11 RF IN 10pF IF BYP 5 IF2 OUT 6 Applications 14 LNA OUT 10 GND BUFFER MIXER IF1 OUT 7 UHF Digital and Analog Receivers Digital Communication Systems Spread-Spectrum Communication Systems Commercial and Consumer Systems 433MHz and 915MHz ISM Band Receivers General Purpose Frequency Conversion 9 DEC 8 LO IN Functional Block Diagram Product Description The RF2418 is a monolithic integrated UHF receiver front-end. The IC contains all of the required components to implement the RF functions of the receiver except for the passive filtering and LO generation. It contains an LNA (low-noise amplifier), a second RF amplifier, a dual-gate GaAs FET mixer, and an IF output buffer amplifier which will drive a 50Ω load. In addition, the IF buffer amplifier may be disabled and a high impedance output is provided for easy matching to IF filters with high impedances. The output of the LNA is made available as an output to permit the insertion of a bandpass filter between the LNA and the RF/Mixer section. The LNA section may be disabled by removing the VDD1 connection to the IC. Ordering Information RF2418 RF2418PCBA-41X Low Current LNA/Mixer Fully Assembled Evaluation Board Optimum Technology Matching® Applied GaAs HBT 9GaAs MESFET InGaP HBT SiGe BiCMOS Si BiCMOS SiGe HBT GaAs pHEMT Si CMOS Si BJT GaN HEMT RF MICRO DEVICES®, RFMD®, Optimum Technology Matching®, Enabling Wireless Connectivity™, PowerStar®, POLARIS™ TOTAL RADIO™ and UltimateBlue™ are trademarks of RFMD, LLC. BLUETOOTH is a trademark owned by Bluetooth SIG, Inc., U.S.A. and licensed for use by RFMD. All other trade names, trademarks and registered trademarks are the property of their respective owners. ©2006, RF Micro Devices, Inc. Rev A7 DS060203 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. 1 of 12 RF2418 Absolute Maximum Ratings Parameter Rating Unit Supply Voltage -0.5 to 7 VDC +6 dBm Input LO and RF Levels Ambient Operating Temperature -40 to +85 °C Storage Temperature -40 to +150 °C Parameter Min. Specification Typ. Max. Caution! ESD sensitive device. Exceeding any one or a combination of the Absolute Maximum Rating conditions may cause permanent damage to the device. Extended application of Absolute Maximum Rating conditions to the device may reduce device reliability. Specified typical performance or functional operation of the device under Absolute Maximum Rating conditions is not implied. RoHS status based on EUDirective2002/95/EC (at time of this document revision). The information in this publication is believed to be accurate and reliable. However, no responsibility is assumed by RF Micro Devices, Inc. ("RFMD") for its use, nor for any infringement of patents, or other rights of third parties, resulting from its use. No license is granted by implication or otherwise under any patent or patent rights of RFMD. RFMD reserves the right to change component circuitry, recommended application circuitry and specifications at any time without prior notice. Unit Condition T = 25°C, VCC =5V, RF=850MHz, LO=921MHz Overall RF Frequency Range 400 to 1100 Cascade Power Gain 23 MHz dB High impedance output Cascade IP3 -13 dBm Referenced to the input Cascade Noise Figure 2.4 dB Single sideband, includes image filter with 1.0dB insertion loss First Section (LNA) Noise Figure 1.8 Input VSWR 1.5:1 Input IP3 Gain +3.0 13 Reverse Isolation Output VSWR 2.0 dB With external series matching inductor +4.0 dBm 14 dB 40 dB 1.5:1 Second Section (RF Amp, Mixer, IF1) High impedance output Noise Figure 9.5 Input VSWR 1.5:1 Input IP3 Conversion Power Gain 7 Output Impedance dB +1 dBm 9 dB 4000||10pF Ω Second Section (RF Amp, Mixer, IF2) 10 Input VSWR 1.5:1 Conversion Gain Output Impedance 2 of 12 Open Collector Buffered output, 50Ω load Noise Figure Input IP3 Single Sideband With external series matching inductor dB Single Sideband With external series matching inductor -0.5 0 dBm 5 6 dB 30 Ω 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. Rev A7 DS060203 RF2418 Parameter Min. Specification Typ. Max. Unit Condition LO Input LO Frequency LO Level 300 to 1200 MHz -6 to +6 dBm LO to RF Rejection 15 dB LO to IF Rejection 40 dB LO Input VSWR 1.3:1 With pin 5 connected to ground. In order to achieve a low VSWR match at this input, an 82Ω resistor to ground is placed in parallel with this port. Power Supply Voltage 3.0 Current Consumption Rev A7 DS060203 6.5 14 V mA VCC =5.0V, LNA On, Mixer On, Buffer Off 12 20 26 mA VCC =5.0V, LNA On, Mixer On, Buffer On 6 9 20 mA VCC =5.0V, LNA Off, Mixer On, Buffer Off 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. 3 of 12 RF2418 Pin 1 Function LNA IN 2 GND 3 VDD1 4 VDD2 5 IF BYP 6 IF2 OUT 7 8 9 4 of 12 IF1 OUT LO IN RF BYP Description Interface Schematic A series 10nH matching inductor is necessary to achieve specified gain and noise figure at 900MHz. This pin is NOT internally DC-blocked. An external blocking capacitor must be provided if the pin is connected to a device with DC present. A DC path to ground (i.e. an inductor or resistor to ground) is, however, acceptable at this pin. If a blocking capacitor is required, a value of 22pF is recommended. LNA IN Ground connection. Keep traces physically short and connect immediately to ground plane for best performance. Supply Voltage for the LNA only. A 22pF external bypass capacitor is required and an additional 0.01μF is required if no other low frequency bypass capacitors are near by. The trace length between the pin and the bypass capacitors should be minimized. The ground side of the bypass capacitors should connect immediately to ground plane. For large input signals, VDD1 may be disconnected, resulting in the LNA’s gain changing from +11dB to -26dB and current drain decreasing by 4mA. If the LNA is never required for use, then this pin can be left unconnected or grounded, and Pin 11 is used as the first input. Power supply for the IF buffer amplifier. If the high impedance mixer output is being used, then this pin is not connected. If this pin is connected to ground, an internal 10pF capacitor is connected in parallel with the mixer output. This capacitor functions as an LO trap, which reduces the amount of LO to IF bleed-through and prevents high LO voltages at the mixer output from degrading the mixer’s dynamic range. At higher IF frequencies, this capacitance, along with parasitic layout capacitance, should be parallel resonated out by the choice of the bias inductor value at pin 7. If the internal capacitor is not connected to ground, the buffer amplifier could become unstable. A ~10pF capacitor should be added at the output to maintain the buffer’s stability, but the gain will not be significantly affected. 50Ω buffered (open source) output port, one of two output options. Pin 7 must have a bias resistor to VDD and pin 6 must have a bias resistor to ground (see Buffered Output Application Schematic) in order to turn the buffer amplifier on. Current drain will increase by approximately 8mA at 5V, and by approximately 5mA at 3V. It is recommended that these bias resistors be less than 1kΩ. High impedance (open drain) output port, one of two output options. This pin must be connected to VDD through a resistor or inductor in order to bias the mixer, even when using IF2 Output. In addition, a 0.01μF bypass capacitor is required at the other end of the bias resistor or inductor. The ground side of the bypass capacitor should connect immediately to ground plane. This output is intended to drive high impedance IF filters. The recommended matching network is shunt L, series C (see the application schematic, high impedance output). This topology will provide matching, bias, and DC-blocking. Mixer LO input. A high-pass matching network, such as a single shunt inductor (as shown in the application schematics), is the recommended topology because it also rejects IF noise at the mixer input. This filtering is required to achieve the specified noise figures. This pin is NOT internally DC-blocked. An external blocking capacitor must be provided if the pin is connected to a device with DC present. A DC path to ground (i.e. an inductor or resistor to ground) is, however, acceptable at this pin. If a blocking capacitor is required, a value of 22pF is recommended. Connection for the external bypass capacitor for the mixer RF input preamp. 1000pF is recommended. The trace length between the pin and the capacitor should be minimized. The ground side of the bypass capacitor should connect immediately to ground plane. 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. IF2 OUT IF1 OUT LO IN Rev A7 DS060203 RF2418 Pin 10 11 12 13 14 Function GND RF IN GND GND LNA OUT Description Interface Schematic Same as pin 2. Mixer RF Input port. For a 50Ω match at 900MHz use a 15nH series inductor. This pin is NOT internally DC-blocked. An external blocking capacitor must be provided if the pin is connected to a device with DC present. A DC path to ground (i.e. an inductor or resistor to ground) is, however, acceptable at this pin. If a blocking capacitor is required, a value of 22pF is recommended.To minimize the mixer’s noise figure, it is recommended to have a RF bandpass filter before this input. This will prevent the noise at the image frequency from being converted to the IF. R F IN Same as pin 2. Same as pin 2. 50Ω output. Internally DC-blocked. LNA OUT Package Drawing 0.156 0.148 .018 .014 0.010 0.004 0.347 0.339 0.050 0.252 0.236 0.059 0.057 8° MAX 0° MIN 0.0500 0.0164 Rev A7 DS060203 0.010 0.007 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. 5 of 12 RF2418 Application Schematic High Impedance Output Configuration 850MHz I m a g e 10 nH I F R F IN F V Di D l t e r 100 nF , F i l t e r LNA 1 14 2 13 3 47 pF RF AM P 5 0 Ω 12 15 nH 11 4 10pF H i 10 5 1 nF 6 Z C1 IF O U T BUFFER 7 V DD L1 M IX E R 9 4 pF L O IN 8 10 nH 100 nF L 1 a n d C 1 a r e p i c k e d t o m a t c h t h e m i x e r 's o u t p u t i m p e d a n c e ( 4 k Ω I I 1 0 p F ) t o t h e I F f i l t e r 's i m p e d a n c e , a t t h e I F f r e q u e n c y . C 1 a l s o s e r v e s a s a D C b l o c k , i n c a s e t h e I F f i l t e r i s n o t a n o p e n c ir c u it a t D C . 6 of 12 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. Rev A7 DS060203 RF2418 Application Schematic Buffered Output Configuration 850MHz I m a g e 10 nH R F IN V DD 100 nF 47 pF F i l t e r , LN A 1 14 2 13 3 12 RF AMP 4 5 0 Ω 15nH 11 10pF 5 10 C1 1 nF IF O U T 6 I F F i l V Dt D e r , 5 0 Ω R1 7 BUFFER M IX E R 9 4 pF L O IN 8 10 nH R2 L1 L 1 s h o u ld p a r a lle l r e s o n a t e , a t t h e IF f r e q u e n c y , w it h th e in t e r n a l 1 0 p F c a p a c ito r p lu s a n y e x t r a p a r a s it ic la y o u t c a p a c it a n c e . 100 nF 100 nF R 1 a n d R 2 a r e b ia s r e s is t o r s t h a t s e t t h e b ia s c u r r e n t f o r t h e b u f fe r a m p lifie r . T h e v a lu e r e c o m m e n d e d is 5 1 0 W , e a c h . H ig h e r v a lu e s w ill d e c r e a s e th e c u r r e n t c o n s u m p tio n b u t a ls o d e c r e a s e t h e o u t p u t le v e l a t w h ic h v o lta g e c lip p in g b e g in s to o c c u r . A t lo w e r IF f r e q u e n c ie s , w h e r e t h e in te r n a l 1 0 p F c a p a c ito r d o e s n o t r o ll o ff th e c o n v e r s io n g a in , L 1 m a y b e e lim in a t e d . C 1 is a b lo c k in g c a p a c ito r , in c a s e th e I F f ilte r 's in p u t is n o t a n o p e n c ir c u it a t D C . Rev A7 DS060203 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. 7 of 12 RF2418 Evaluation Board Schematic RF=850MHz, IF=71MHz 50 Ω μstrip J1 LNA IN L3 10 nH R4 5.11 kΩ 14 2 13 3 RF AMP P1-3 Jumper E2 E1 J2 IF OUT see note 50 Ω μstrip LNA 1 4 C3 47 pF 12 11 10pF 5 R3 610 Ω 6 C1 0.1 μF 10 BUFFER MIXER 7 9 50 Ω μstrip L2 18 nH 50 Ω μstrip J5 LNA OUT J4 RF IN C2 1 nF C5 3 pF to 5 pF 50 Ω μstrip 8 L4 10 nH J3 LO IN TP1 C4 0.1 μF R1 300 Ω L1 1 μH see note 2418400C P1 NC VDD 8 of 12 Notes: For high impedance output 1) Populate L1 and TP1 2) Remove jumper E1 to E2 P1-3 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. 1 2 GND 3 VDD Rev A7 DS060203 RF2418 Evaluation Board Layout Board Size 1.52” x 1.52” Board Thickness 0.031”, Board Material FR-4 Rev A7 DS060203 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. 9 of 12 RF2418 10.0 26.0 9.5 24.0 9.0 22.0 Gain (dB) Gain (dB) High Impedance Mixer Gain versus Voltage, RF=850MHz 8.5 8.0 High Impedance Casc. Gain versus Voltage, RF=850MHz 20.0 18.0 T =-40 T =-40 7.5 T =26 16.0 T = 26 T = 85 T = 85 7.0 14.0 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 3.0 3.5 4.0 Voltage (V) -10.0 6.0 6.5 T =-40 -10.5 T = 26 T = 85 T =26 -11.0 3.0 T = 85 -11.5 IIP3 (dBm) IIP3 (dBm) 5.5 High Impedance Casc. Input IP3 versus Voltage, RF=850MHz T =-40 3.5 5.0 Voltage (V) High Impedance Mixer Input IP3 versus Voltage, RF=850MHz 4.0 4.5 2.5 2.0 -12.0 -12.5 -13.0 -13.5 1.5 -14.0 1.0 -14.5 0.5 -15.0 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 3.0 3.5 4.0 Voltage (V) 5.5 6.0 6.5 6.0 6.5 Buffered Mixer Gain versus Voltage, RF=850MHz 15.0 16.0 14.0 15.0 13.0 14.0 12.0 13.0 11.0 Gain (dB) Gain (dB) 5.0 Voltage (V) Buffered LNA Gain versus Voltage, RF=850MHz 17.0 4.5 12.0 11.0 10.0 T =-40 T = 26 T = 85 10.0 9.0 8.0 T =-40 9.0 7.0 T = 26 8.0 6.0 T =85 7.0 5.0 3.0 3.5 4.0 4.5 5.0 Voltage (V) 10 of 12 5.5 6.0 6.5 3.0 3.5 4.0 4.5 5.0 5.5 Voltage (V) 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. Rev A7 DS060203 RF2418 Buffered Casc. Gain versus Voltage, RF=850MHz 30.0 Buffered LNA Input versus Voltage, RF=850MHz 6.0 T =-40 T =-40 4.0 T =26 25.0 T = 26 T =85 T = 85 0.0 20.0 IIP3 (dBm) Gain (dB) 2.0 15.0 -2.0 -4.0 -6.0 10.0 -8.0 5.0 -10.0 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 3.0 3.5 4.0 Voltage (V) -10.0 6.5 T =26 -11.0 T = 85 T = 85 0.5 -12.0 0.0 IIP3 (dBm) IIP3 (dBm) 6.0 T =-40 T = 26 1.0 5.5 Buffered Casc. Input IP3 versus Voltage, RF=850MHz T =-40 1.5 5.0 Voltage (V) Buffered Mixer Input IP3 versus Voltage, RF=850MHz 2.0 4.5 -0.5 -1.0 -13.0 -14.0 -1.5 -2.0 -15.0 -2.5 -3.0 -16.0 3.0 3.5 4.0 4.5 5.0 5.5 6.0 3.0 6.5 3.5 4.0 Voltage (V) 5.0 5.5 6.0 6.5 Voltage (V) Buffered LNA Noise Figure versus Voltage, RF=850MHz Part to Part Variation 2.0 4.5 Buffered Mixer Noise Figure versus Voltage, RF=850MHz Part to Part Variation 11.0 Part 1 Part 1 Part 2 Part 2 Part 3 Part 3 10.5 Part 4 Part 4 1.8 Part 5 Gain (dB) Gain (dB) Part 5 10.0 1.6 9.5 1.4 9.0 3.0 3.5 4.0 4.5 5.0 Voltage (V) Rev A7 DS060203 5.5 6.0 6.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 Voltage (V) 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. 11 of 12 RF2418 12 of 12 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. Rev A7 DS060203