MICRF113 300MHz to 450MHz +10dBm ASK Transmitter in SOT23 General Description Features The MICRF113 is a high-performance, easy-to-use, singlechip ASK Transmitter IC for remote wireless applications in the 300MHz to 450MHz frequency band. This transmitter IC is a true “data-in, antenna-out” monolithic device. MICRF113 has three strong attributes: power delivery, operating voltage and operating temperature. In terms of power, the MICRF113 is capable of delivering +10dBm into a 50Ω load. This power level enables a small form factor transmitter (lossy antenna) such as a key fob transmitter to operate near the maximum limit of transmission regulations. In terms of operating voltage, the MICRF113 operates from 1.8V to 3.6V. Many transmitter ICs in the same frequency band stop operating below 2.0V. The MICRF113 will work with most batteries to the end of their useful limits. In terms of operating temperature, the MICRF113 operates from −40°C to +85°C. The MICRF113 is easy to use. It requires a reference frequency (RF carrier frequency divided by 32 times) generated from a crystal with a few additional external parts to create a complete versatile transmitter. The MICRF113 operates with Amplitude Shift Keying/OnOff Keyed (ASK/OOK) UHF receiver types from wide-band super-regenerative radios to narrow-band, highperformance super-heterodyne receivers. The MICRF113’s maximum ASK bit rate is 20kbps (minimum pulse width of 50µs at ASK pin). The MICRF113 transmitter solution is ideal for industrial and consumer applications where simplicity and form factor are important. Data sheets and support documentation can be found on Micrel’s web site at: www.micrel.com. • • • • • • • • Complete UHF ASK transmitter Frequency range 300MHz to 450MHz Bit rates up to 20kbps Output power up to 10dBm Low external part count Low voltage operation (down to 1.8V) Operate with crystals or ceramic resonators 6-pin SOT23 Applications • • • • • Fan Controllers Remote Power Switches Multimedia Remote Control Remote Sensor Data Links Infrared Transmitter Replacement Ordering Information Part Number Temperature Range Package MICRF113YM6 −40°C to +85°C SOT23-6 QwikRadio is a registered trademark of Micrel, Inc. Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com November 2010 M9999-112310 Micrel, Inc. MICRF113 Typical Application Figure 1. Typical Application Circuit for 433.92MHz and 315MHz (component values for 315MHz in parenthesis) Pin Configuration Pin Description Pin Number MSOP-6 Pin Name 1 PAOUT 2 VSS Ground 3 VDD Positive Power Supply Voltage (Input) 4 XTLOUT 5 XTLIN 6 ASK November 2010 Pin Function PA output Crystal Out (Output): Reference Oscillator Output Connection. Crystal In (Input): Reference Oscillator Input Connection. ASK DATA Input 2 M9999-112310 Micrel, Inc. MICRF113 Absolute Maximum Ratings(1) Operating Ratings(2) Supply Voltage VDD .....................................................+5.0V Voltage on PAOUT ........................................................+7.2V Voltage on I/O Pins ............................ VSS – 0.3 to VDD + 0.3 Storage Temperature Range ...................−65°C to + 150°C Lead Temperature (soldering, 10s)......................... + 300°C ESD Rating(3) .................................................................. 2kV Supply Voltage VDD .......................................... 1.8V to 3.6V Ambient Operating Temperature (TA) ......... –40°C to +85°C Transmitter Frequency Range ............. 300MHz to 450MHz Electrical Characteristics(4) VDD = 3.0V, TA = 25°C, FreqREFOSC = 13.560MHz. Bold values indicate –40°C to 85°C unless otherwise noted. 2kbps bit rate, 50Ω load. Parameter Condition Min. Typ. Max. Units Power Supply Mark Supply Current IMARK, @ 315MHz, POUT = +10dBm 12.3 VASK = 3.0V @ 433.92MHz, POUT = +10dBm 12.5 SPACE Supply Current, ISPACE, @ 315MHz 2 VASK = 0V @ 433.92 MHz 2 @315MHz(4) 10 mA mA RF Output Section and Modulation Limits Output Power Level, POUT ASK "mark" Harmonics Output for 315MHz Harmonics Output for 433.92MHz @433.92MHz (4) @ 630MHz(4) 2nd harm. −39 (4) −53 @945MHz 3rd harm. @ 867.84MHz(4) 2nd harm. @1301.76MHz (4) dBm 10 3rd harm. dBc −55 dBc −55 Extinction Ratio for ASK 70 dBc ASK Modulation Encoded Bit Rate Occupied Bandwidth 20 @315MHz (6) @433.92MHz <700 (6) <1000 kbps kHz VCO Section 315MHz Single-Side Band Phase Noise 433.92MHz Single-Side Band Phase Noise @ 100kHz from Carrier −76 @ 1000kHz from Carrier −79 @ 100kHz from Carrier −72 @ 1000kHz from Carrier −81 dBc/Hz dBc/Hz Notes: 1. Exceeding the absolute maximum rating may damage the device. 2. The device is not guaranteed to function outside its operating rating. 3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF. 4. Measured using Test Circuit in Figure 2. 5. Dependent on crystal 6. RBW = 100kHz, OBW measured at −20dBc. November 2010 3 M9999-112310 Micrel, Inc. MICRF113 Electrical Characteristics(4) (Continued) VDD = 3.0V, TA = 25°C, FreqREFOSC = 13.560MHz. Bold values indicate –40°C to 85°C unless otherwise noted. 2kbps bit rate, 50Ω load. Parameter Condition Min. Typ. Max. Units Reference Oscillator Section XTLIN, XTLOUT Pin capacitance 2 pF External Capacitance From each side of the crystal to GND 18 pF Oscillator Startup Time(5) Crystal: HC49S 300 µs VDD transition from LOW to HIGH 500 µs Digital / Control Section Output Blanking Digital Input ASK Pin Digital Input Leakage Current ASK Pin 0.8 × VDD High (VIH) Low (VIL) 0.2 × VDD High (VIH) 0.05 Low (VIL) 0.05 Undervoltage Lock Out (UVLO) November 2010 1.6 4 V µA V M9999-112310 Micrel, Inc. MICRF113 Test Circuit Figure 2. MICRF113 Test Circuit with 50Ω Output November 2010 5 M9999-112310 Micrel, Inc. MICRF113 Typical Characteristics − MICRF113 50Ω Test Board 315MHz OBW, ASK = 2kbps 315MHz OBW, ASK = 20kbps CW Max Power @ 3V, 315MHz(1) RF Spectrum 2nd Harmonic; Fundamental at 315MHz RF Spectrum 3rd Harmonic; Fundamental at 315MHz 315MHz, Power Level at Space, VDD = 3.0V, ASK = 2kbps, −62dBm November 2010 6 M9999-112310 Micrel, Inc. MICRF113 Typical Characteristics − MICRF113 50Ω Test Board (Continued) 315MHz, Zero Span , ASK = 2kbps 315MHz, Zero Span, ASK = 20kbps 315MHz, Phase Noise, ASK = 2kbps, 100kHz Offset, –75.59dBc/Hz 315MHz, Phase Noise, ASK = 2kbps, 1MHz Offset, –78.99dBc/Hz 315MHz, Phase Noise, ASK = CW, 100kHz Offset, –70.96dBc/Hz 315MHz, Phase Noise, ASK = CW, 1MHz Offset, –76.72dBc/Hz November 2010 7 M9999-112310 Micrel, Inc. MICRF113 Typical Characteristics − MICRF113 50Ω Test Board (Continued) 433.92MHz OBW, ASK = 2kbps 433.92MHz OBW, ASK = 20kbps (1) nd 433.92MHz, CW Max Power @ 3V, ASK = 2kbps RF Spectrum 2 RF Spectrum 3rd Harmonic; Fundamental at 433.92MHz November 2010 Harmonic; Fundamental at 433.92MHz 433.92MHz Power Level at Space, VDD = 3.0V, ASK = 2kbps, -52dBm 8 M9999-112310 Micrel, Inc. MICRF113 Typical Characteristics − MICRF113 50Ω Test Board (Continued) 433.92MHz Zero Span, 2kbps 433.92ASK Zero Span at 20kbps 433.92MHz Phase Noise, ASK = CW, 100kHz Offset, −81.73dBc/Hz 433.92MHz Phase Noise, ASK = CW, 1MHz Offset, –78.49dBc/Hz 433.92MHz Phase Noise, ASK = 2kbps, 100kHz Offset, –71.64dBc/Hz 433.92MHz Phase Noise, ASK = 2kbps, 1MHz Offset, –79.4dBc/Hz November 2010 9 M9999-112310 Micrel, Inc. MICRF113 Functional Diagram Figure 3. MICRF113 Functional Block Diagram November 2010 10 M9999-112310 Micrel, Inc. MICRF113 When the ESR of crystal is at 300Ω, the crystal parameter limits are: Functional Description Figure 3 is a functional block diagram of the MICRF113 transmitter. The MICRF113 is best described as a phase locked transmitter. The MICRF113 system is partitioned into five functional blocks: • Crystal oscillator • PLL×32 • Power amplifier • Enable control • Undervoltage detection ESR 20Ω Cpar 2 to 10pF • Cmo 10 to 40fF 300Ω CPAR 2 to 5pF • CMO 10 to 40fF • CLOAD 10 to 30pF Power Amplifier The power amplifier serves two purposes: 1) to buffer the VCO from external elements and 2) to amplify the phase locked signal. The power amplifier can produce +10dBm at 3V (typical). Crystal Oscillator Parameters for ASK Operation Figure 4 shows a reference oscillator circuit configuration for ASK operation. The reference oscillator is capable of driving crystals with ESR range from 20Ω to 300Ω. When the ESR of crystal is at 20Ω, the crystal parameter limits are: • ESR • PLL ×32 The function of PLL×32 is to provide a stable carrier frequency for transmission. It is a “divide by 32” phase locked loop oscillator. Crystal Oscillator The reference oscillator is crystal-based Pierce configuration, designed to accept crystals with frequency from 9.375MHz to 14.0625MHz. • • Enable Control Enable control gates the ASK data. It only allows transmission when Lock, Amplitude and Under Voltage Detect conditions are valid. Undervoltage Detect “Undervoltage detect” block senses operating voltage. If the operating voltage falls below 1.6V, “undervoltage detect” block will send a signal to “enable control” block to disable the PA. CRYSTAL MODEL XTLOUT ESR CMO CLOAD VSS CPAR CLOAD XTLIN MICRF113 ASK Figure 4. Reference Oscillator ASK Operation November 2010 11 M9999-112310 Micrel, Inc. MICRF113 Application Information 50Ω Test Board, VDD = 3.0V R7 (Ω) The MICRF113 is well suited to drive a 50Ω load, monopole or a loop antenna. Figure 6 is an example of a loop antenna configuration. Figure 6 also shows both 315MHz and 433.92MHz ASK configurations for a loop antenna. Besides using a different crystal, Table 1 lists modified values needed for the listed frequencies. Frequency (MHz) L1 (nH) C5 (pF) L4 (nH) C7 (pF) Y1 (MHz) 315.0 470 10 150 6.8 9.84375 433.92 820 12 68 4.7 13.5600 Output Power (dBm) IDD (mA) 0 10 12.3 75 8.5 11 100 8.0 10.5 500 3.0 7.3 1000 -2.0 5.9 Table 2. Output Power vs. External Resistor @ 315MHz 50Ω Test Board, VDD = 3.0V Table 1. Modified Values for Listed Frequencies The reference design shown in Figure 6 has an antenna optimized for using the matching network as described in Table 1. Power Amplitude Control Using External Resistor R7 is used to adjust the RF amplitude output levels which may be needed to meet compliance regulation. As an example, the following tables list typical values of conducted RF output levels and corresponding R7 resistor values for the 50Ω test board, as shown in Figure 2. R7 of the TX113-1C Demo board using the loop antenna can be adjusted for the appropriate radiated field allowed by FCC or ETSI compliance. Contact Micrel for suggested R7 values to meet FCC and ETSI compliances. November 2010 R7 (Ω) Output Power (dBm) IDD (mA) 0 9.8 12.5 75 8.9 12 100 8.6 11.8 500 2.0 8.9 1000 −3.0 7.3 Table 3. Output Power vs. External Resistor @ 433.92MHz 12 M9999-112310 Micrel, Inc. MICRF113 Notes: 1. Components labeled NP are not placed. 2. Values in parenthesis apply only to 315MHz option. 3. Value of R7 is selected to vary the output power. Figure 6. ASK 433.92MHz and 315MHz November 2010 13 M9999-112310 Micrel, Inc. MICRF113 Output Power ON-OFF Control There are two ways to enable the PA output power. First, by supplying the ASK signal with VDD applied continuously, resulting in a Mark and Space RF output condition. A second method involves applying both VDD and ASK synchronously. The second method allows for longer battery usage since the battery is disconnected during non-activation. Figure 7 shows the RF output time response since VDD and the ASK are applied to the MICRF113. The RF output response, as a function of VDD, is typically less then 1.25mSec. This measurement was done using the circuitry shown in Figure 2. Note: The ASK signal should never be applied before VDD. Output Matching Network Part of the function of the output network is to attenuate the second and third harmonics. When matching to a transmit frequency, care must be taken both to optimize for maximum output power, and to attenuate unwanted harmonics. Layout Issues PCB Layout is a primary concern for achieving optimum performance and consistent manufacturing results. Care must used with the orientation of components to ensure that they do not couple or decouple the RF signal. PCB trace length should be short to minimize parasitic inductance (1 inch ~ 20nH). For example, depending upon inductance values, a 0.5 inch trace can change the inductance by as much as 10%. To reduce parasitic inductance, the practice of using wide traces and a ground plane under the signal traces is recommended. Vias with low value inductance should be used for components requiring a connection-to-ground. Antenna Layout Directivity is affected by antenna trace layout. No ground plane should be under the antenna trace. For consistent performance, components should not be placed inside the loop of the antenna. Gerber formats (see Figure 8, for a suggested layout) can be obtained from the Micrel web site at: http://www.micrel.com. Figure 7. RF Output Response (VDD and ASK) November 2010 14 M9999-112310 Micrel, Inc. MICRF113 Assembly Drawing Top Layer Bottom Layer Figure 8. PCB Demo Board November 2010 15 M9999-112310 Micrel, Inc. MICRF113 Functional Description Pin Figure 8 shows the TX113-1c Demo Board PCB layout and assembly (Gerber format). Figure 9 is a detailed schematic of the TX113-1c. Note that components labeled as NP (not placed) can be used to obtain different configurations. Table 4 describes each header pin connector used in the demo board. Function Name Functional Description J1-1 VDD 1.8V to 3.6V input voltage J1-2 VSS Ground J1-3 ASK Modulating Data Input J2-1 REF-OSC External Reference Oscillator Input J2-2 VSS Ground Table 4. Demo Board Pin Names and Descriptions Notes: 1. NP = Not Placed 2. Values in parenthesis apply only to 315MHz option. 3. R7 is selected to vary output power Figure 9. TX113-1c Demo Board Schematic November 2010 16 M9999-112310 Micrel, Inc. MICRF113 Bill of Materials (433.92MHz) Item C1 C2 C5 Part Number GRM21BR60J106K GRM1885C1H101J GRM1885C1H120J C6, C11, C16 C7 C10 GQM1875C2E4R7C GRM188R61C104K C13, C14 GRM1885C1H180J J1 TSHR-114-S-02-A-GT L1 0805CS-471XJB L4 0603CS-068NXJB L5 ANTENNA LOOP (Part of PCB) R2 CRCW0603100KFKEA Manufacturer Description Qty. (1) 10µF ±10%, 0805 capacitor 1 (1) 100pF ±5%, 0603 capacitor 1 (1) 12pF ±5%, 0603 capacitor 1 (1) Murata (NP) 3 Murata(1) Murata Murata Murata 4.7pF ±0.25pF, 0603 capacitor 1 (1) 0.1µF ±10%, 0603 capacitor 1 (1) 18pF ±5%, 0603 capacitor 2 Murata Murata 3-pin header 1 (2) 470nH ±5%, 0805 wire-wound inductor 1 (2) 68nH ±5%, 0603 wire-wound inductor 1 PCB ANTENNA 1 (3) 100kΩ ±5%, 0603 resistor 1 (3) Coilcraft Coilcraft Vishay R7 CRC06030000Z0EA Vishay 0Ω ±5%, 0603 resistor 1 Y1 SA-13.5600-F-10-J-30-30-x Hosonic Industrial Brazil(4) 13.560MHZ ±30ppm crystal 1 U1 MICRF113YM6 300MHz to 450MHz +10dBm ASK Transmitter in SOT23 1 Micrel, Inc.(5) Notes: 1. Murata Tel: www.murata.com. 2. Coilcraft.: www.coilcraft.com. 3. Vishay Tel: www.vishay.com. 4. Hosonic Industrial Brazil: www.hib.com.br 5. Micrel, Inc.: www.micrel.com. November 2010 17 M9999-112310 Micrel, Inc. MICRF113 Bill of Materials (315MHz) Item C1 C2 C5 Part Number GRM21BR60J106K GRM1885C1H101J GRM1885C1H120J C6, C11, C16 C7 C10 GQM1875C2E4R7C GRM188R61C104K C13, C14 GRM1885C1H180J J1, J2 TSHR-114-S-02-A-GT L1 0805CS-471XJB L4 0603CS-R15XJB L5 ANTENNA LOOP (Part of PCB) R2 CRCW0603100KFKEA Manufacturer Description Qty. (1) 10µF ±10%, 0805 capacitor 1 (1) 100pF ±5%, 0603 capacitor 1 (1) 10pF ±5%, 0603 capacitor 1 (1) Murata (NP) 3 Murata(1) Murata Murata Murata 6.8pF ±0.25pF, 0603 capacitor 1 (1) 0.1µF ±10%, 0603 capacitor 1 (1) 18pF ±5%, 0603 capacitor 2 Murata Murata 3-pin header 1 Coilcraft (2) 470nH ±5%, 0805 wire-wound inductor 1 Coilcraft (2) 150nH ±5%, 0603 wire-wound inductor 1 PCB ANTENNA 1 (3) 100kΩ ±5%, 0603 resistor 1 (3) Vishay R7 CRC06030000Z0EA Vishay 0Ω ±5%, 0603 resistor 1 Y1 SA-9.84375-F-10- J-30-30-x Hosonic Industrial Brazil(4) 9.84375MHZ ±30ppm crystal 1 U1 MICRF113YM6 300MHz to 450MHz +10dBm ASK Transmitter in SOT23 1 Micrel, Inc.(5) Notes: 1. Murata Tel: www.murata.com 2. Coilcraft.: www.coilcraft.com. 3. Vishay Tel: www.vishay.com. 4. Hosonic Industrial Brazil: www.hib.com.br 5. Micrel, Inc.: www.micrel.com. November 2010 18 M9999-112310 Micrel, Inc. MICRF113 PCB Layout Recommendations (50Ω Test Board) Assembly Drawing Top Layer November 2010 19 M9999-112310 Micrel, Inc. MICRF113 PCB Layout Recommendations (50Ω Test Board) Bottom Layer November 2010 20 M9999-112310 Micrel, Inc. MICRF113 Package Information Notes: 1. Dimensions and tolerances are in accordance with ANSI Y14.5M, 1982. 2. Package surface to be mirror finish. 3. Die is facing up for mold. Die is facing down for trim/form, that is, reverse trim/form. 4. The foot-length measuring is based on the gauge plane method. 5 Dimensions are exclusive of mold flash and gate burr. 6-Pin SOT (YM6) 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 data sheet. 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. © 2008 Micrel, Incorporated. November 2010 21 M9999-112310