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| 19-4383; Rev 1; 3/09 KIT ATION EVALU BLE AVAILA 315MHz/433MHz Low-Noise Amplifier for Automotive RKE Features o Optimized for 308MHz, 315MHz, 418MHz, and 433.92MHz o 2.2V to 5.5V Supply Voltage Range o Low Operating Supply Current 2.5mA (typ), 4mA (max) o Logic-Controlled 1A (max) Shutdown o Typical Performance at 315MHz 1.25dB Noise Figure -16dBm Input IP3 15.5dB Power Gain o Automotive Temperature Range -40C to +125C o ESD Rating of 2.5kV (HBM) on All Pins o AEC-Q100 Qualification General Description The MAX2634 low-noise amplifier (LNA) with low-power shutdown mode is optimized for 315MHz and 433.92MHz automotive remote keyless entry (RKE) applications. At 315MHz, the LNA achieves 15.5dB power gain and a 1.25dB noise figure while only consuming 2.5mA of supply current from a 2.2V to 5.5V power supply. An integrated logic-controlled low-power shutdown mode reduces power consumption to 0.1A and replaces the two transistors typically required to implement the shutdown function in discrete-based RKE LNA solutions. The device further reduces component count by integrating the output matching and DCblocking components, and only requires a single inductor to match the input for best noise figure and input return loss. The device is available in a small 6-pin (2.0mm x 2.2mm x 0.9mm) lead-free SC70 package for automotive applications that require visual inspection of PCB solder connections. MAX2634 Applications Remote Keyless Entry (RKE) Tire Pressure Monitoring Systems (TPMS) Security Garage Door Openers Telemetry Receivers TOP VIEW GND SHDN GND Ordering Information PART MAX2634AXT+ TEMP RANGE -40C to +125C PINPACKAGE 6 SC70 TOP MARK +ADG +Denotes a lead(Pb)-free/RoHS-compliant package. Pin Configuration + 1 2 3 MAX2634 6 5 4 RFOUT VCC RFIN SC70 Functional Diagram/Typical Operating Circuit appears at end of data sheet. Performance Table FREQUENCY (MHz) 308 315 418 433.92 L1 (nH) 56 56 33 33 SUPPLY CURRENT (mA) 2.5 2.5 2.5 2.5 GAIN (dB) 15.5 15.5 13.5 13.5 NOISE FIGURE (dB) 1.25 1.25 1.25 1.25 INPUT P1dB (dBm) -29 -29 -26 -26 INPUT IP3 (dBm) -16 -16 -12 -12 ________________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com. 315MHz/433MHz Low-Noise Amplifier for Automotive RKE MAX2634 ABSOLUTE MAXIMUM RATINGS VCC Pin to GND .....................................................-0.3V to +6.0V RFIN.................Pin Must Be AC-Coupled with DC-Blocking Cap RFOUT, SHDN............................................-0.3V to (VCC + 0.3V) RF Input Power .................................................................+5dBm Continuous Power Dissipation (TA = +70C) 6-Pin SC70 (derate 3.1mW/C above +70C) ..............245mW Junction-to-Case Thermal Resistance (JC) (Note 1) ......................................................................115C/W Junction-to-Ambient Thermal Resistance (JA) (Note 1) ......................................................................326C/W Operating Temperature Range .........................-40C to +125C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +160C Lead Temperature (soldering, 10s)....................................300C Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a 4-layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial. Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. CAUTION! ESD SENSITIVE DEVICE DC ELECTRICAL CHARACTERISTICS (VCC = +2.2V to +5.5V, TA = -40C to +125C, Typical values are at VCC = +3.0V, TA = +25C, unless otherwise noted. RFIN and RFOUT are AC-coupled and terminated to 50. No RF input signals at RFIN and RFOUT.) (Note 2) PARAMETER Operating Supply Voltage Operating Supply Current Shutdown Supply Current SHDN = high, TA = +25C SHDN = high, TA = -40C to +125C VSHDN = 0, TA = +25C VSHDN = 0, TA = -40C to +125C 1.1 0.4 VSHDN = VIH VSHDN = VIL 130 20 5 1 CONDITIONS MIN 2.2 2.5 TYP MAX 5.5 4 6 1 10 UNITS V mA mA A A V V A A s s DIGITAL CONTROL INPUTS (SHDN) Digital Input-Voltage High Digital Input-Voltage Low Digital Input-Current High Digital Input-Current Low SHUTDOWN MODE CONTROL Enable Time Disable Time 2 _______________________________________________________________________________________ 315MHz/433MHz Low-Noise Amplifier for Automotive RKE AC ELECTRICAL CHARACTERISTICS (MAX2634 EV Kit, VCC = +2.2V to +5.5V, TA = -40C to +125C. Typical values are at VCC = +3.0V and TA = +25C, unless otherwise noted. PRFIN = -40dBm, SHDN = high.) (Note 2) PARAMETER fRFIN = 315MHz Power Gain Noise Figure Input Third-Order Intercept Point Input 1dB Compression Point Input Return Loss Output Return Loss Reverse Isolation fRFIN = 433.92MHz Power Gain Noise Figure Input Third-Order Intercept Point Input 1dB Compression Point Input Return Loss Output Return Loss Reverse Isolation TA = +25C (Note 4) TA = -40C to +125C, VCC = +3.0V (Note 4) TA = +25C (Note 3) 11 10 1.25 -12 -26 11 8 60 13.5 dB dB dBm dBm dB dB dB TA = +25C TA = -40C to +125C, VCC = +3.0V TA = +25C (Note 3) 12.5 11.5 1.25 -16 -29 10 8 60 15.5 dB dB dBm dBm dB dB dB CONDITIONS MIN TYP MAX UNITS MAX2634 Note 2: Guaranteed by production test at TA = +25C. Guaranteed by design and characterization at TA = -40C and TA = +125C. Note 3: Measured with two tones located at 315MHz and 316MHz or 433MHz and 434MHz at -40dBm/tone. Note 4: Guaranteed by design and characterization. Typical Operating Characteristics (MAX2634 EV Kit, VCC = +2.2V to +5.5V, TA = -40C to +125C. Typical values are at VCC = +3.0V and TA = +25C, unless otherwise noted. fRFIN = 315MHz/433MHz, PRFIN = -40dBm, SHDN = high.) S11, S22, S21 vs. FREQUENCY (315MHz) MAX2634 toc01 MAX2634 toc02 SUPPLY CURRENT vs. SUPPLY VOLTAGE 4.0 TA = +125C 3.5 SUPPLY CURRENT (mA) TA = +25C 20 15 10 S11, S22, S21 (dB) 5 0 -5 -10 TA = -40C 1.5 2.2 3.3 4.4 SUPPLY VOLTAGE (V) 5.5 -15 -20 200 S11, S22, S21 vs. FREQUENCY (433MHz) 15 10 MAX2634 toc03 20 S21 S11, S22, S21 (dB) 3.0 S11 5 0 -5 -10 S21 S11 2.5 2.0 S22 300 400 500 FREQUENCY (MHz) 600 -15 S22 -20 200 300 400 500 FREQUENCY (MHz) 600 _______________________________________________________________________________________ 3 315MHz/433MHz Low-Noise Amplifier for Automotive RKE MAX2634 Typical Operating Characteristics (contineed) (MAX2634 EV Kit, VCC = +2.2V to +5.5V, TA = -40C to +125C. Typical values are at VCC = +3.0V and TA = +25C, unless otherwise noted. fRFIN = 315MHz/433MHz, PRFIN = -40dBm, SHDN = high.) IIP3 vs. SUPPLY VOLTAGE (315MHz) MAX2634 toc04 IIP3 vs. SUPPLY VOLTAGE (433MHz) MAX2634 toc05 NOISE FIGURE vs. SUPPLY VOLTAGE (433MHz) TA = +125C 2.0 NOISE FIGURE (dB) TA = +25C 1.5 MAX2634 toc06 -10 TA = +125C -12 -5 TA = +125C -8 TA = +25C 2.5 IIP3 (dBm) -16 TA = -40C IIP3 (dBm) -14 TA = +25C -11 -14 1.0 -18 -17 TA = -40C 0.5 TA = -40C 0 2 3 4 5 SUPPLY VOLTAGE (V) 6 2 3 4 5 SUPPLY VOLTAGE (V) 6 -20 2 3 4 5 SUPPLY VOLTAGE (V) 6 -20 NOISE FIGURE vs. SUPPLY VOLTAGE (315MHz) MAX2634 toc07 GAIN vs. SUPPLY VOLTAGE (433MHz) MAX2634 toc08 GAIN vs. SUPPLY VOLTAGE (315MHz) TA = -40C 16 15 GAIN (dB) 14 TA = +125C 13 TA = +25C MAX2634 toc09 2.5 TA = +125C 2.0 NOISE FIGURE (dB) TA = +25C 17 16 15 GAIN (dB) 14 13 TA = -40C 17 1.5 TA = +25C 1.0 0.5 TA = -40C 0 2 3 4 5 SUPPLY VOLTAGE (V) 6 12 11 2 3 TA = +125C 12 11 4 5 SUPPLY VOLTAGE (V) 6 2 3 4 5 SUPPLY VOLTAGE (V) 6 TURN-ON TIME MAX2634 toc10 SHUTDOWN TIME -30 -40 OUTPUT POWER (dBm) -50 -60 -70 -80 -90 -100 -110 -120 1AVG fRFIN = 315MHz PRFIN = -43dBm MAX2634 toc11 -20 -30 -40 OUTPUT POWER (dBm) -50 -60 -70 -80 -90 -100 -110 -120 0 1AVG fRFIN = 315MHz PRFIN = -43dBm -20 20 40 60 80 100 120 140 160 180 200 TIME (s) 0 5 10 15 20 25 30 35 40 45 50 TIME (s) 4 _______________________________________________________________________________________ 315MHz/433MHz Low-Noise Amplifier for Automotive RKE Pin Description PIN 1, 3 2 4 5 6 NAME GND SHDN RFIN VCC RFOUT FUNCTION Ground. Use minimum path to ground plane to minimize inductance. Shutdown Input. A logic-level high enables the LNA, and a logic-level low disables the LNA. RF Input. Requires an inductor to match the input for best noise figure and return loss. A DC-blocking capacitor is required if the RFIN input will see a DC voltage or ground. See the Functional Diagram/Typical Operating Circuit. Supply Voltage. Bypass to ground with a 0.01F capacitor as close as possible to the pin. RF Output. Internally matched to 50 and incorporates an internal DC-blocking capacitor. MAX2634 Table 1. Typical Input and Output Impedances in R+jX Format (VCC = +3.0V, TA = +25C.) FREQUENCY (MHz) 100 200 308 315 418 434 500 600 INPUT IMPEDANCE R 58 43 29 29.4 29.2 28.5 26.4 26.7 X -438 -216 -139 -137 -101 -96 -83 -69 R 92 92.1 91.2 91 90.5 89.5 91 87.5 OUTPUT IMPEDANCE X -94 -50 -35.8 -35 -30 -29.3 -28.2 -27.3 Detailed Description The MAX2634 LNA with low-power shutdown mode is optimized for 308MHz, 315MHz, 418MHz, and 433MHz automotive RKE applications, which are required to operate over the -40C to +125C automotive temperature range. The device reduces component count by integrating the output matching and DC-blocking components, and only requires a single inductor to match the input for best noise figure and input return loss. An integrated logic-controlled low-power shutdown mode reduces power consumption to 0.1A and replaces the two transistors typically required to implement the shutdown function in discrete-based RKE LNA solutions. Input Matching The MAX2634 requires an off-chip input matching network. The Functional Diagram/Typical Operating Circuit shows the recommended input-matching network component values for operation at 315MHz and 433MHz. These values are optimized for the best simultaneous gain, noise figure, and return loss performance. Table 1 lists typical input and output impedances. _______________________________________________________________________________________ 5 315MHz/433MHz Low-Noise Amplifier for Automotive RKE MAX2634 RF Input Coupling Capacitor Input IP3 vs. Enable Time The value of the coupling capacitor affects input IP3 and turn-on time. A larger coupling capacitor results in higher input IP3 at the expense of longer turn-on time. See Table 3 for the typical amount of trade-off. Table 2. MAX2634 Typical Noise Parameters (VCC = +3.0V, TA = +25C.) FREQUENCY (MHz) 308 315 418 434 FMIN (dB) 0.64 0.65 0.78 0.80 |OPT| 0.50 0.49 0.44 0.44 |OPT| ANGLE 27.0 27.7 37.4 38.9 RN () 9.78 9.78 9.87 9.88 Integrated Output Matching Network and DC-Block The MAX2634 integrates the output matching network and DC-block, eliminating the need for external matching components while providing a broadband match. See the Functional Diagram/Typical Operating Circuit for component values. Shutdown The MAX2634 features a shutdown pin to disable the entire chip. Apply a logic-high to the SHDN pin to place the part in the active mode, and a logic-low to place the part in the shutdown mode. Table 3. RF Input Coupling Capacitor Input IP3 vs. Enable Time INPUT DC-BLOCKING CAPACITOR, C1 (nF) 1 3.3 22 100 1000 ENABLE TIME (s) 6 20 130 600 6000 INPUT IP3 AT 315MHz (dBm) -19 -14 -12 -11 -11 Power-Supply Bypassing Bypassing the V CC line is necessary for optimum gain/linearity performance. See the Functional Diagram/Typical Operating Circuit for bypassing capacitor values. Layout Information A properly designed PCB is essential to any RF/ microwave circuit. Use controlled-impedance lines on all high-frequency inputs and outputs. Bypass with decoupling capacitors located close to the device's VCC pin. For long VCC lines, it may be necessary to add additional decoupling capacitors. These additional capacitors can be located farther away from the device package. Proper grounding of the GND pins is essential. If the PCB uses a topside RF ground, connect it directly to all GND pins. For a board where the ground plane is not on the component layer, the best technique is to connect the GND pins to the board with a plated through-hole located close to the package. Chip Information PROCESS: SiGe BiCMOS 6 _______________________________________________________________________________________ 315MHz/433MHz Low-Noise Amplifier for Automotive RKE Functional Diagram/Typical Operating Circuit MAX2634 + GND 1 MAX2634 6 RFOUT RF OUTPUT VCC LOGIC CONTROL SHDN 2 5 VCC C3 100pF C2 0.01F BIAS GND 3 4 RFIN L1* C1** 22nF RF INTPUT *L1 = 56nH FOR 308MHz/315MHz. *L1 = 33nH FOR 418MHz/433.92MHz. **C1 = DC-BLOCK. OPTIONAL IF DC IS NOT APPLIED TO RFIN. Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. PACKAGE TYPE 6 SC70 PACKAGE CODE X6SN-1 DOCUMENT NO. 21-0077 _______________________________________________________________________________________ 7 315MHz/433MHz Low-Noise Amplifier for Automotive RKE MAX2634 Revision History REVISION NUMBER 0 1 REVISION DATE 10/08 3/09 Initial release Updated the Features, Performance Table, Electrical Characteristics, and Typical Operating Characteristics sections. DESCRIPTION PAGES CHANGED -- 1, 3, 4 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2009 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc. |
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