19-4383; Rev 1; 3/09 KIT ATION EVALU E L B AVAILA 315MHz/433MHz Low-Noise Amplifier for Automotive RKE Features o Optimized for 308MHz, 315MHz, 418MHz, and 433.92MHz 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 0.1µA 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. o 2.2V to 5.5V Supply Voltage Range o Low Operating Supply Current 2.5mA (typ), 4mA (max) o Logic-Controlled 1µA (max) Shutdown o Typical Performance at 315MHz 1.25dB Noise Figure -16dBm Input IP3 15.5dB Power Gain o Automotive Temperature Range -40°C to +125°C o ESD Rating of ±2.5kV (HBM) on All Pins 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. o AEC-Q100 Qualification Ordering Information Applications Remote Keyless Entry (RKE) Tire Pressure Monitoring Systems (TPMS) Security PART TEMP RANGE PINPACKAGE TOP MARK MAX2634AXT+ -40°C to +125°C 6 SC70 +ADG +Denotes a lead(Pb)-free/RoHS-compliant package. Garage Door Openers Pin Configuration Telemetry Receivers TOP VIEW + GND 1 SHDN 2 GND 3 MAX2634 6 RFOUT 5 VCC 4 RFIN SC70 Functional Diagram/Typical Operating Circuit appears at end of data sheet. Performance Table FREQUENCY (MHz) L1 (nH) SUPPLY CURRENT (mA) GAIN (dB) NOISE FIGURE (dB) INPUT P1dB (dBm) INPUT IP3 (dBm) 308 56 2.5 15.5 1.25 -29 -16 315 56 2.5 15.5 1.25 -29 -16 418 33 2.5 13.5 1.25 -26 -12 433.92 33 2.5 13.5 1.25 -26 -12 ________________________________________________________________ Maxim Integrated Products 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. 1 MAX2634 General Description MAX2634 315MHz/433MHz Low-Noise Amplifier for Automotive RKE 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 = +70°C) 6-Pin SC70 (derate 3.1mW/°C above +70°C) ..............245mW Junction-to-Case Thermal Resistance (θJC) (Note 1) ......................................................................115°C/W Junction-to-Ambient Thermal Resistance (θJA) (Note 1) ......................................................................326°C/W Operating Temperature Range .........................-40°C to +125°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +160°C Lead Temperature (soldering, 10s)....................................300°C 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 = -40°C to +125°C, Typical values are at VCC = +3.0V, TA = +25°C, unless otherwise noted. RFIN and RFOUT are AC-coupled and terminated to 50Ω. No RF input signals at RFIN and RFOUT.) (Note 2) PARAMETER CONDITIONS Operating Supply Voltage Operating Supply Current Shutdown Supply Current MIN TYP 2.2 MAX UNITS 5.5 V 4 mA 6 mA VSHDN = 0, TA = +25°C 1 µA VSHDN = 0, TA = -40°C to +125°C 10 µA SHDN = high, TA = +25°C 2.5 SHDN = high, TA = -40°C to +125°C DIGITAL CONTROL INPUTS (SHDN) Digital Input-Voltage High 1.1 V Digital Input-Voltage Low 0.4 V Digital Input-Current High VSHDN = VIH 5 µA Digital Input-Current Low VSHDN = VIL 1 µA SHUTDOWN MODE CONTROL Enable Time 130 µs Disable Time 20 µs 2 _______________________________________________________________________________________ 315MHz/433MHz Low-Noise Amplifier for Automotive RKE (MAX2634 EV Kit, VCC = +2.2V to +5.5V, TA = -40°C to +125°C. Typical values are at VCC = +3.0V and TA = +25°C, unless otherwise noted. PRFIN = -40dBm, SHDN = high.) (Note 2) PARAMETER CONDITIONS MIN TYP TA = +25°C 12.5 15.5 TA = -40°C to +125°C, VCC = +3.0V 11.5 MAX UNITS fRFIN = 315MHz Power Gain Noise Figure TA = +25°C Input Third-Order Intercept Point (Note 3) dB 1.25 dB -16 dBm Input 1dB Compression Point -29 dBm Input Return Loss 10 dB Output Return Loss 8 dB Reverse Isolation 60 dB fRFIN = 433.92MHz Power Gain TA = +25°C (Note 4) 11 TA = -40°C to +125°C, VCC = +3.0V (Note 4) 10 Noise Figure TA = +25°C Input Third-Order Intercept Point (Note 3) 13.5 dB 1.25 dB -12 dBm Input 1dB Compression Point -26 dBm Input Return Loss 11 dB Output Return Loss 8 dB Reverse Isolation 60 dB Note 2: Guaranteed by production test at TA = +25°C. Guaranteed by design and characterization at TA = -40°C and TA = +125°C. 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 = -40°C to +125°C. Typical values are at VCC = +3.0V and TA = +25°C, unless otherwise noted. fRFIN = 315MHz/433MHz, PRFIN = -40dBm, SHDN = high.) 20 15 10 TA = +25°C 2.5 S21 5 S11, S22, S21 (dB) 10 3.0 S11 0 -5 -15 TA = -40°C 2.2 3.3 4.4 SUPPLY VOLTAGE (V) 5.5 S11 0 -5 -15 S22 S22 -20 -20 1.5 S21 5 -10 -10 2.0 MAX2634 toc03 15 S11, S22, S21 (dB) SUPPLY CURRENT (mA) 3.5 20 MAX2634 toc02 TA = +125°C MAX2634 toc01 4.0 S11, S22, S21 vs. FREQUENCY (433MHz) S11, S22, S21 vs. FREQUENCY (315MHz) SUPPLY CURRENT vs. SUPPLY VOLTAGE 200 300 400 500 FREQUENCY (MHz) 600 200 300 400 500 FREQUENCY (MHz) _______________________________________________________________________________________ 600 3 MAX2634 AC ELECTRICAL CHARACTERISTICS Typical Operating Characteristics (contineed) (MAX2634 EV Kit, VCC = +2.2V to +5.5V, TA = -40°C to +125°C. Typical values are at VCC = +3.0V and TA = +25°C, unless otherwise noted. fRFIN = 315MHz/433MHz, PRFIN = -40dBm, SHDN = high.) NOISE FIGURE vs. SUPPLY VOLTAGE (433MHz) IIP3 vs. SUPPLY VOLTAGE (433MHz) 2.5 -8 TA = +125°C 2.0 -16 TA = -40°C -18 -11 -14 -17 TA = +25°C 1.5 1.0 0.5 TA = -40°C -20 TA = -40°C -20 3 4 5 SUPPLY VOLTAGE (V) 6 0 2 3 NOISE FIGURE vs. SUPPLY VOLTAGE (315MHz) 4 5 SUPPLY VOLTAGE (V) 6 2 2.0 16 TA = +25°C 15 GAIN (dB) 1.5 1.0 TA = +25°C TA = -40°C 15 TA = -40°C 14 0 4 5 SUPPLY VOLTAGE (V) 6 11 2 3 4 5 SUPPLY VOLTAGE (V) 2 6 OUTPUT POWER (dBm) -50 -60 1AVG -70 -80 -90 fRFIN = 315MHz PRFIN = -43dBm -40 -50 -60 -70 -80 1AVG -90 -100 -100 -110 -110 -120 -120 0 20 40 60 80 100 120 140 160 180 200 TIME (µs) 4 -30 OUTPUT POWER (dBm) fRFIN = 315MHz PRFIN = -43dBm -40 4 5 SUPPLY VOLTAGE (V) -20 MAX2634 toc10 -30 3 SHUTDOWN TIME TURN-ON TIME -20 TA = +125°C 12 TA = +125°C 11 3 14 13 12 TA = -40°C TA = +25°C 16 13 0.5 6 17 MAX2634 toc08 TA = +125°C 4 5 SUPPLY VOLTAGE (V) GAIN vs. SUPPLY VOLTAGE (315MHz) 17 MAX2634 toc07 2.5 2 3 GAIN vs. SUPPLY VOLTAGE (433MHz) GAIN (dB) 2 MAX2634 toc09 TA = +25°C IIP3 (dBm) IIP3 (dBm) TA = +25°C -14 MAX2634 toc11 -12 TA = +125°C NOISE FIGURE (dB) TA = +125°C MAX2634 toc05 -5 MAX2634 toc04 -10 MAX2634 toc06 IIP3 vs. SUPPLY VOLTAGE (315MHz) NOISE FIGURE (dB) MAX2634 315MHz/433MHz Low-Noise Amplifier for Automotive RKE 0 5 10 15 20 25 30 35 40 45 50 TIME (µs) _______________________________________________________________________________________ 6 315MHz/433MHz Low-Noise Amplifier for Automotive RKE PIN NAME 1, 3 GND Ground. Use minimum path to ground plane to minimize inductance. FUNCTION 2 SHDN Shutdown Input. A logic-level high enables the LNA, and a logic-level low disables the LNA. 4 RFIN 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. 5 VCC Supply Voltage. Bypass to ground with a 0.01µF capacitor as close as possible to the pin. 6 RFOUT RF Output. Internally matched to 50 and incorporates an internal DC-blocking capacitor. Table 1. Typical Input and Output Impedances in R+jX Format (VCC = +3.0V, TA = +25°C.) FREQUENCY (MHz) 100 INPUT IMPEDANCE OUTPUT IMPEDANCE R X R X 58 -438 92 -94 200 43 -216 92.1 -50 308 29 -139 91.2 -35.8 315 29.4 -137 91 -35 418 29.2 -101 90.5 -30 434 28.5 -96 89.5 -29.3 500 26.4 -83 91 -28.2 600 26.7 -69 87.5 -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 -40°C to +125°C 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 0.1µA 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 MAX2634 Pin Description MAX2634 315MHz/433MHz Low-Noise Amplifier for Automotive RKE 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. 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. Table 2. MAX2634 Typical Noise Parameters (VCC = +3.0V, TA = +25°C.) |ΓOPT| FREQUENCY (MHz) FMIN (dB) |ΓOPT| 308 0.64 0.50 27.0 9.78 315 0.65 0.49 27.7 9.78 418 0.78 0.44 37.4 9.87 434 0.80 0.44 38.9 9.88 ANGLE RN (Ω) 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. 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. 6 Table 3. RF Input Coupling Capacitor Input IP3 vs. Enable Time INPUT DC-BLOCKING CAPACITOR, C1 (nF) ENABLE TIME (µs) INPUT IP3 AT 315MHz (dBm) 1 6 -19 3.3 20 -14 22 130 -12 100 600 -11 1000 6000 -11 Chip Information PROCESS: SiGe BiCMOS _______________________________________________________________________________________ 315MHz/433MHz Low-Noise Amplifier for Automotive RKE + GND 1 MAX2634 6 RFOUT RF OUTPUT VCC LOGIC CONTROL 5 VCC SHDN 2 C3 100pF BIAS GND 3 4 RFIN L1* C2 0.01µF 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 PACKAGE CODE DOCUMENT NO. 6 SC70 X6SN-1 21-0077 _______________________________________________________________________________________ 7 MAX2634 Functional Diagram/Typical Operating Circuit MAX2634 315MHz/433MHz Low-Noise Amplifier for Automotive RKE Revision History REVISION NUMBER REVISION DATE 0 10/08 Initial release 1 3/09 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 © 2009 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.