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micrf113 300mhz to 450mhz + 10dbm ask transmitter in sot23 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 general description the micrf113 is a high-performance, easy-to-use, single- chip 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 50? 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 ? 40c to + 85c. 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/on- off keyed (ask/ook) uhf receiv er types from wide-band super-regenerative radios to narrow-band, high- performance super-heterodyne receivers. the micrf113?s maximum ask bit rate is 20kbps (minimum pulse width of 50s 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 . features ? 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 ? 40c to + 85c sot23-6
micrel, inc. micrf113 november 2010 2 m9999-112310 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 pin function 1 paout pa output 2 vss ground 3 vdd positive power supply voltage (input) 4 xtlout crystal out (output): refer ence oscillator output connection. 5 xtlin crystal in (input): reference oscillator input connection. 6 ask ask data input
micrel, inc. micrf113 november 2010 3 m9999-112310 absolute maximum ratings (1) supply voltage v dd .....................................................+5.0v voltage on pa out ........................................................+7.2v voltage on i/o pins ............................ v ss ? 0.3 to v dd + 0.3 storage temperat ure range ................... ? 65c to + 150c lead temperature (soldering, 10s) ......................... + 300c esd rating (3) .................................................................. 2kv operating ratings (2) supply voltage v dd .......................................... 1.8v to 3.6v ambient operating temperature (t a ) ......... ?40c to +85c transmitter frequency range ............. 300mhz to 450mhz electrical characteristics (4) v dd = 3.0v, t a = 25c, freq refosc = 13.560mhz. bold values indicate ?40c to 85c unless otherwise noted. 2kbps bit rate, 50 ? load. parameter condition min. typ. max. units power supply @ 315mhz, p out = +10dbm 12.3 mark supply current i mark , v ask = 3.0v @ 433.92mhz, p out = +10dbm 12.5 ma @ 315mhz 2 space supply current, i space , v ask = 0v @ 433.92 mhz 2 ma rf output section and modulation limits @315mhz (4) 10 output power level, p out ask "mark" @433.92mhz (4) 10 dbm @ 630mhz (4) 2nd harm. ? 39 harmonics output for 315mhz @945mhz (4) 3rd harm. ? 53 dbc @ 867.84mhz (4) 2nd harm. ? 55 harmonics output for 433.92mhz @1301.76mhz (4) 3rd harm. ? 55 dbc extinction ratio for ask 70 dbc ask modulation encoded bit rate 20 kbps @315mhz (6) <700 occupied bandwidth @433.92mhz (6) <1000 khz vco section @ 100khz from carrier ? 76 315mhz single-side band phase noise @ 1000khz from carrier ? 79 dbc/hz @ 100khz from carrier ? 72 433.92mhz single-side band phase noise @ 1000khz from carrier ? 81 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. handli ng precautions recommended. human body mo del, 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.
micrel, inc. micrf113 november 2010 4 m9999-112310 electrical characteristics (4) (continued) v dd = 3.0v, t a = 25c, freq refosc = 13.560mhz. bold values indicate ?40c to 85c unless otherwise noted. 2kbps bit rate, 50 ? 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 s digital / control section output blanking vdd transition from low to high 500 s high (v ih ) 0.8 v dd digital input ask pin low (v il ) 0.2 v dd v high (v ih ) 0.05 digital input leakage current ask pin low (v il ) 0.05 a undervoltage lock out (uvlo) 1.6 v
micrel, inc. micrf113 november 2010 5 m9999-112310 test circuit figure 2. micrf113 test circuit with 50 ? output
micrel, inc. micrf113 november 2010 6 m9999-112310 typical characteristics ? micrf113 50 ? test board 315mhz obw, ask = 2kbps 315mhz obw, ask = 20kbps cw max power @ 3v, 315mhz (1) rf spectrum 2 nd harmonic; fundamental at 315mhz rf spectrum 3 rd harmonic; fundamental at 315mhz 315mhz, power level at space, vdd = 3.0v, ask = 2kbps, ? 62dbm
micrel, inc. micrf113 november 2010 7 m9999-112310 typical characteristics ? micrf113 50 ? 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
micrel, inc. micrf113 november 2010 8 m9999-112310 typical characteristics ? micrf113 50 ? test board (continued) 433.92mhz obw, ask = 2kbps 433.92mhz obw, ask = 20kbps 433.92mhz, cw max power @ 3v, ask = 2kbps (1) rf spectrum 2 nd harmonic; fundamental at 433.92mhz rf spectrum 3 rd harmonic; fundamental at 433.92mhz 433.92mhz power level at space, vdd = 3.0v, ask = 2kbps, -52dbm
micrel, inc. micrf113 november 2010 9 m9999-112310 typical characteristics ? micrf113 50 ? 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
micrel, inc. micrf113 november 2010 10 m9999-112310 functional diagram figure 3. micrf113 func tional block diagram
micrel, inc. micrf113 november 2010 11 m9999-112310 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 ? pll32 ? power ampli er ? enable control ? undervoltage detection crystal oscillator the reference oscillator is crystal-based pierce con guration, designed to accept crystals with frequency from 9.375mhz to 14.0625mhz. crystal oscillator parameters for ask operation figure 4 shows a reference oscillator circuit con guration for ask operation. the reference oscillator is capable of driving crystals with esr range from 20 ? to 300 ? . when the esr of crystal is at 20 ? , the crystal parameter limits are: ? esr 20 ? ? cpar 2 to 10pf ? cmo 10 to 40ff esr xtlout vss xtlin micrf113 ask crystal model c load c par c mo c load figure 4. reference o scillator ask operation when the esr of crystal is at 300 ? , the crystal parameter limits are: ? esr 300 ? ? c par 2 to 5pf ? c mo 10 to 40ff ? c load 10 to 30pf pll 32 the function of pll32 is to provide a stable carrier frequency for transmiss ion. it is a ?divide by 32? phase locked loop oscillator. 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). 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.
micrel, inc. micrf113 november 2010 12 m9999-112310 application information the micrf113 is well suited to drive a 50 ? 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 conf igurations 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 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 50 ? 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. 50? test board, vdd = 3.0v r7 ( ? ) 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 50? test board, vdd = 3.0v r7 ( ? ) 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
micrel, inc. micrf113 november 2010 13 m9999-112310 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
micrel, inc. micrf113 november 2010 14 m9999-112310 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 se cond 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. figure 7. rf output response (vdd and ask) 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 an tenna 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 .
micrel, inc. micrf113 november 2010 15 m9999-112310 assembly drawing top layer bottom layer figure 8. pcb demo board
micrel, inc. micrf113 november 2010 16 m9999-112310 functional description 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. pin 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
micrel, inc. micrf113 november 2010 17 m9999-112310 bill of materials (433.92mhz) item part number manufacturer description qty. c1 grm21br60j106k murata (1) 10f 10%, 0805 capacitor 1 c2 grm1885c1h101j murata (1) 100pf 5%, 0603 capacitor 1 c5 grm1885c1h120j murata (1) 12pf 5%, 0603 capacitor 1 c6, c11, c16 murata (1) (np) 3 c7 gqm1875c2e4r7c murata (1) 4.7pf 0.25pf, 0603 capacitor 1 c10 grm188r61c104k murata (1) 0.1f 10%, 0603 capacitor 1 c13, c14 grm1885c1h180j murata (1) 18pf 5%, 0603 capacitor 2 j1 tshr-114-s-02-a-gt 3-pin header 1 l1 0805cs-471xjb coilcraft (2) 470nh 5%, 0805 wire-wound inductor 1 l4 0603cs-068nxjb coilcraft (2) 68nh 5%, 0603 wire-wound inductor 1 l5 antenna loop (part of pcb) pcb antenna 1 r2 crcw0603100kfkea vishay (3) 100k ? 5%, 0603 resistor 1 r7 crc06030000z0ea vishay (3) 0 ? 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 micrel, inc. (5) 300mhz to 450mhz + 10dbm ask transmitter in sot23 1 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 .
micrel, inc. micrf113 november 2010 18 m9999-112310 bill of materials (315mhz) item part number manufacturer description qty. c1 grm21br60j106k murata (1) 10f 10%, 0805 capacitor 1 c2 grm1885c1h101j murata (1) 100pf 5%, 0603 capacitor 1 c5 grm1885c1h120j murata (1) 10pf 5%, 0603 capacitor 1 c6, c11, c16 murata (1) (np) 3 c7 gqm1875c2e4r7c murata (1) 6.8pf 0.25pf, 0603 capacitor 1 c10 grm188r61c104k murata (1) 0.1f 10%, 0603 capacitor 1 c13, c14 grm1885c1h180j murata (1) 18pf 5%, 0603 capacitor 2 j1, j2 tshr-114-s-02-a-gt 3-pin header 1 l1 0805cs-471xjb coilcraft (2) 470nh 5%, 0805 wire-wound inductor 1 l4 0603cs-r15xjb coilcraft (2) 150nh 5%, 0603 wire-wound inductor 1 l5 antenna loop (part of pcb) pcb antenna 1 r2 crcw0603100kfkea vishay (3) 100k ? 5%, 0603 resistor 1 r7 crc06030000z0ea vishay (3) 0 ? 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 micrel, inc. (5) 300mhz to 450mhz + 10dbm ask transmitter in sot23 1 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 .
micrel, inc. micrf113 november 2010 19 m9999-112310 pcb layout recommendations (50 ? test board) assembly drawing top layer
micrel, inc. micrf113 november 2010 20 m9999-112310 pcb layout recommendations (50 ? test board) bottom layer
micrel, inc. micrf113 november 2010 21 m9999-112310 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 dow n 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 t he 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 it s use. micrel reserves the right to change circuitry, specifications and descriptions at any time without notice. no license, whether expre ss, implied, arising by estoppel or other wise, to any intellectual property rights is granted by this document. except as provided in micrel?s terms and conditions of sale for such products, mi crel assumes no liability whatsoever, and micrel disclaims any express or implied warranty relating to the sale and/or use of micrel products including l iability or warranties relating to fitness for a particular purpose, merchantability, or infringement of an y patent, copyright or other intellectual p roperty right micrel products are not designed or authori zed for use as components in life support app liances, devices or systems where malfu nction of a product reasonably be expected to result in pers onal injury. life support devices or system s are devices or systems that (a) are in tended for surgical impla into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significan t injury to the user. a purchaser?s use or sale of micrel produc ts for use in life support app liances, 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. can nt ? 2008 micrel, incorporated.

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