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Technical content

Features

  • AEC-Q100 Automotive Qualified
  • 300MHz to 450MHz frequency range
  • Data rates up to 50kbps ASK/10kbps FSK
  • 1.8V to 3.6V operating voltage range
  • +10dBm output power (CW) at 3.0V
  • 11.5mA of supply current at +10dBm (CW)
  • 6.9mA of supply current at 1kbps (ASK, Manchester)
  • 50nA supply current in shutdown mode
  • Needs only one crystal to set the desired RF frequency
  • –40˚C to +125˚C operating temperature range
  • 10-pin MSOP package (4.9mm x 3.0mm)

Applications

  • Remote keyless entry systems (RKE)
  • Tire pressure monitoring systems (TPMS)

Ordering Information

Part Number Temp. Range Package MAQRF112YMM –40°C to +125°C 10-Pin MSOP Typical Application

Micrel, Inc. MAQRF112 February 7, 2013 2 Revision 1.0 Pin Configuration 10-Pin MSOP (YMM) Pin Description Pin Number Pin Name Pin Function 1 ASK ASK Data Input and PA Enable. When EN is set to a logic-level HIGH and ASK is set to a logic- level HIGH, the power amplifier (PA) is enabled. A logic-level LOW on ASK disables the power amplifier. Apply a data stream less than 50Kbps (Manchester Encoded, 50% duty-cycle) for ASK modulation. To transmit with FSK modulation, both EN and ASK need to be set to a logic-level HIGH, while the FSK pin is modulated. 2 XTLIN Reference Oscillator Input Connection. Connect a crystal between XTLIN and XTLOUT. Connect a load capacitor from XTLIN to ground, based on the recommendations of the crystal manufacturer. 3 XTLOUT Reference Oscillator Output Connection. Connect a crystal between XTLIN and XTLOUT. Connect a load capacitor from XTLOUT to ground, based on the recommendations of the crystal manufacturer. 4 VSS Ground. 5 XTAL_MOD FSK Crystal Pulling Switch Connection. For FSK modulation, connect a capacitor between the XTAL_MOD pin and XTLOUT. For ASK-only operation, this pin can be left unconnected. 6 FSK FSK Data Input. A logic-level LOW opens the FSK crystal pulling switch, providing high impedance (>1MΩ) between the XTAL_MOD pin and VSS (ground). A logic-level HIGH closes the switch, providing low impedance (15Ω) between XTAL_MOD and VSS (ground). This parallels the crystal pulling capacitor, CFSK, with the crystal load capacitor, CLOAD, and pulls the reference frequency to achieve FSK modulation. For ASK-only operation, pulling this pin low is recommended. 7 EN Enable/Shutdown Input. A logic-level LOW disables the entire device, placing it in a low-power shutdown mode. A logic-level HIGH enables the crystal oscillator, PLL, voltage-controlled oscillator (VCO), and control blocks, if the supply voltage is above the undervoltage lockout (UVLO) voltage. The power amplifier is enabled when a logic-level HIGH is applied to EN and ASK. 8 VSSPA Power Amplifier Ground. 9 PAOUT Open Collector of Power Amplifier Output. Pull the PA_OUT pin to VDD through an inductor to properly bias the output stage. Add a pull-up resistor in series to reduce bias current and to achieve lower output power and lower supply current operation. A matching network is required to match the output to desired load (PCB antenna, wire antenna, or 50Ω load) to achieve best output power, supply current, and spectral performance. See the “Applications Information” section for recommended power supply bypassing.

10 VDD Power Supply for Crystal Oscillator, Phase-Locked Loop, Voltage-Controlled Oscillator, and

Control Blocks. See the “Applications Information” section for recommended power supply bypassing.

Micrel, Inc. MAQRF112 February 7, 2013 3 Revision 1.0 Absolute Maximum Ratings(1) Operating Ratings(2) Supply Voltage (VVDD, VPAOUT)………………+1.8V to +3.6V Electrical Characteristics(4) MICRF/MAQRF112 50Ω Evaluation Board. Bold values indicate TA = –40°C to +125°C unless otherwise noted. 1Kbps data rate, 50% duty cycle, pulse width = 500µs. Parameter Condition Min Typ Max Units Power Supply Standby Supply Current VVDD = 3.6V, VEN = 0V 0.05 3 µA Mark Supply Current fRF = 315MHz VVDD = VASK = 3.0V 11.5 mA VVDD = VASK = 3.6V 12.1 14.5 mA fRF = 433.92MHz VVDD = VASK = 3.0V 11.6 mA VVDD = VASK = 3.6V 12.1 15.0 mA SPACE Supply Current fRF = 315MHz VVDD = 3.0V, VASK = 0V 2.4 mA VVDD = 3.6V, VASK = 0V 2.5 3.5 mA fRF = 433.92MHz VVDD = 3.0V, VASK = 0V 2.7 mA VVDD = 3.6V, VASK = 0V 2.8 3.8 mA ASK Modulated Supply Current fRF = 315MHz VVDD = 3.0V, VASK = 1kHz 6.9 mA fRF = 433.92MHz VVDD = 3.0V, VASK = 1kHz 7.2 mA RF Output Section and Modulation Limits Output Power Level VASK = 3.0V fRF = 315MHz 5 10 dBm fRF = 433.92MHz 6 10 dBm Harmonic Output fRF = 315MHz fHARMONIC = 630MHz –53 dBc fHARMONIC = 945MHz –53 dBc fRF = 433.92MHz fHARMONIC = 867.84MHz –51 dBc fHARMONIC = 1301.76MHz –65 dBc Extinction Ratio for ASK fRF = 315MHz 80 dBc fRF = 433.92MHz 90 dBc FSK Modulation Maximum Data Rate Manchester Encoded (50% Duty Cycle)(4) 10 Kbps Maximum Frequency Deviation Crystal = HC49/US, load capacitor = 10pF (4) ±25 kHz XTAL_MOD to VSS Impedance, RDSon FSK = VSS 1 MΩ FSK = VDD 15 35 Ω ASK Modulation Maximum Data Rate Manchester Encoded (50% Duty Cycle) 50 kbps

Micrel, Inc. MAQRF112 February 7, 2013 4 Revision 1.0 Parameter Condition Min Typ Max Units Occupied Bandwidth fRF = 315MHz(5) 630 kHz fRF = 433.92MHz(5) 670 kHz VCO Section Single Side-Band Phase Noise fRF = 315MHz fOFFSET = 100kHz –76 dBc/Hz fOFFSET = 1000kHz –79 dBc/Hz fRF = 433.92MHz fOFFSET = 100kHz –72 dBc/Hz fOFFSET = 1000kHz –81 dBc/Hz Reference Oscillator Section XTLIN, XTLOUT, XTLMOD Pin capacitance 2 pF Oscillator Start-Up Time Crystal: HC49S, Note 4 400 µs Digital/Control Section Digital Input Threshold Voltage (EN, ASK, and FSK) High (V IH) 0.8VDD V Low (VIL) 0.2VDD V Digital Input Current (EN, ASK, and FSK) High (IIH), VDD = 3.6V 0.05 1 µA Low (IIL), VDD = 3.6V 0.05 1 µA Supply Undervoltage Lock Out (UVLO) 1.6 V Notes: 1. Exceeding the absolute maximum ratings can damage the device. 2. The device is not guaranteed to function outside its operating ratings. 4. Dependent on crystal. 5. RBW = 100kHz, OBW measured at –20dBc. 6. Data rate = 50kbps, pulse width = 10µs, pulse repetition time = 20µs.

Micrel, Inc. MAQRF112 February 7, 2013 5 Revision 1.0 Typical Characteristics (MAQRF112, 50Ω Evaluation Board, VVDD = 3.0V, VASK = VEN = VDD, TA = +25°C unless otherwise noted) 8.0 8.5 9.0 9.5 10.0 10.5 11.0 11.5 12.0 SUPPLY CURRENT (mA) SUPPLY VOLTAGE (V) Supply Current vs. Supply Voltage fRF = 315MHz, VASK = VDD TA = -40˚C TA = +125˚C TA = +25˚C 2.1 2.2 2.3 2.4 2.5 2.6 SUPPLY CURRENT (mA) SUPPLY VOLTAGE (V) Supply Current vs. Supply Voltage fRF = 315MHz, VASK = GND TA = -40˚C TA = +25˚C TA = +125˚C 5.0 5.5 6.0 6.5 7.0 7.5 SUPPLY CURRENT (mA) SUPPLY VOLTAGE (V) ASK Modulated Supply Current vs. Supply Voltage fRF = 315MHz, VASK = 1Kbps (50%) TA = -40˚C TA = +125˚C TA = +25˚C 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.0 10.5 11.0 OUTPUT POWER (dBm) SUPPLY VOLTAGE (V) Output Power vs. Supply Voltage fRF = 315MHz, VASK = VDD TA = +125˚C TA = -40˚C TA = +25˚C -55 -50 -45 -40 2nd HARMONIC SUPPRESSION (dBc) SUPPLY VOLTAGE (V) 2nd Harmonic vs. Supply Voltage fRF = 315MHz, VASK = VDD TA = +125˚C TA = +25˚C TA = -40˚C -56 -55 -54 -53 -52 -51 -50 3rd HARMONIC SUPPRESSION (dBc) SUPPLY VOLTAGE (V) 3rd Harmonic vs. Supply Voltage fRF = 315MHz, VASK = VDD TA = +125˚C TA = +25˚C TA = -40˚C 0 100 200 300 400 500 600 700 800 900 1000 SUPPLY CURRENT (mA) OUTPUT POWER (dBm) RBIAS (Ω) Output Power and Supply Current vs. RBIAS fRF = 315MHz, VASK = VDD Output Power Supply Current Output Power Supply Current

Micrel, Inc. MAQRF112 February 7, 2013 6 Revision 1.0 Typical Characteristics (Continued) 8.5 9.0 9.5 10.0 10.5 11.0 11.5 12.0 12.5 SUPPLY CURRENT (mA) SUPPLY VOLTAGE (V) Supply Current vs. Supply Voltage fRF = 433.92MHz, VASK = VDD TA = -40˚C TA = +25˚C TA = +125˚C 2.4 2.5 2.6 2.7 2.8 2.9 SUPPLY CURRENT (mA) SUPPLY VOLTAGE (V) Supply Current vs. Supply Voltage fRF = 433.92MHz, VASK = GND TA = -40˚C TA = +25˚C TA = +125˚C 5.5 6.0 6.5 7.0 7.5 SUPPLY CURRENT (mA) SUPPLY VOLTAGE (V) Supply Current vs. Supply Voltage fRF = 433MHz, VASK = 1Kbps (50%) TA = -40˚C TA = +25˚C TA = +125˚C 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.0 10.5 11.0 OUTPUT POWER (dBm) SUPPLY VOLTAGE (V) Output Power vs. Supply Voltage fRF = 433.92MHz, VASK = VDD TA = +25˚C TA = -40˚C TA = +25˚C -60 -55 -50 -45 2nd HARMONIC SUPPRESSION (dBc) SUPPLY VOLTAGE (V) 2nd Harmonic vs. Supply Voltage fRF = 433MHz, VASK = VDD TA = +125˚C TA = -40˚C TA = +25˚C -75 -70 -65 -60 -55 3rd HARMONIC SUPPRESSION (dBc) SUPPLY VOLTAGE (V) 3rd Harmonic vs. Supply Voltage fRF = 433.92MHz, VASK = VDD TA = -40˚C TA = +125˚C TA = +25˚C 0 100 200 300 400 500 600 700 800 900 1000 SUPPLY CURRENT (mA) OUTPUT POWER (dBm) RBIAS (Ω) Output Power and Supply Current vs. RBIAS fRF = 433.92MHz, VASK = VDD (Mark) Supply Current Output Power

Micrel, Inc. MAQRF112 February 7, 2013 10 Revision 1.0 Power Amplifier The power amplifier serves two purposes: to buffer the VCO from external elements and to amplify the phase- locked signal. The power amplifier can produce +10dBm at 3V (typical). The PA output matching network to a 50Ω load or to a PC B antenna serves two purposes: to optimize PA output power and to minimize unwanted harmonics. Matching values are a function of operational frequency and load impedance seen by the MAQRF112. The “Application Information” section provides matching values for 315MHz and 433.92MHz. Power Control Using an External Resistor A resistor (R7 on the 50Ω evaluation board) is in series with the output RF choke and can be used to adjust the RF output power and supply current . This adjustment can also be used to lower the power to meet FCC compliance. See the “Output Power and Supply Current vs. R BIAS” graphs in the “Typical Characteristics” section for examples of performance on the 50 Ω evaluation boards. An e valuation board using a PCB antenna can have its radiated power lowered by adjusting this series resistor. The resistor value must be calibrated empirically, and will vary depending on the final product PCB layout and form factor. Enable Control The E nable control gates the ASK data to the PA. It allows transmission only when the l ock, crystal amplitude, and undervoltage detect conditions are valid. An Enable and ASK logic -level HIGH places the PA in the Mark condition. An E nable logic-level LOW disables the power amplifier. An Enable logic-level HIGH and an ASK logic -level LOW places the PA in the Space condition. To transmit with FSK modulation, both the EN and ASK pins must be set to a logic-level HIGH while the FSK pin is digitally modulated with a logic-level signal. ASK Input Control An ASK logic -level data input modulates the RF carrier when the PA is enabled. A pply a data stream less than 50Kbps (Manchester Encoded, 50% duty -cycle) for ASK modulation. Tying the FSK pin low is recommended when ASK modulation is used. Undervoltage Detect The under voltage detect block senses the operating voltage. If the operating v oltage falls below 1.6V, the undervoltage detect block sends a signal to the enable control block to disable the PA.

Micrel, Inc. MAQRF112 February 7, 2013 15 Revision 1.0 Package Information(1) 10-Pin MSOP Package Type (YMM) Note: MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this datasheet. This information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry, specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. © 2013 Micrel, Incorporated.