View MC145028DWR2_7015814.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

mc145026 mc145027 mc145028 motorola wireless rf, if and transmitter device data 3.2263 cmos these devices are designed to be used as encoder/decoder pairs in remote control applications. the mc145026 encodes nine lines of information and serially sends this information upon receipt of a transmit enable (te ) signal. the nine lines may be encoded with trinary data (low, high, or open) or binary data (low or high). the words are transmitted twice per encoding sequence to increase security. the mc145027 decoder receives the serial stream and interprets five of the trinary digits as an address code. thus, 243 addresses are possible. if binary data is used at the encoder, 32 addresses are possible. the remaining serial information is interpreted as four bits of binary data. the valid transmission (vt) output goes high on the mc145027 when two conditions are met. first, two addresses must be consecutively received (in one encoding sequence) which both match the local address. second, the 4 bits of data must match the last valid data received. the active vt indicates that the information at the data output pins has been updated. the mc145028 decoder treats all nine trinary digits as an address which allows 19,683 codes. if binary data is encoded, 512 codes are possible. the vt output goes high on the mc145028 when two addresses are consecutively received (in one encoding sequence) which both match the local address. ? operating temperature range: 40 to + 85 c ? verylow standby current for the encoder: 300 na maximum @ 25 c ? interfaces with rf, ultrasonic, or infrared modulators and demodulators ? rc oscillator, no crystal required ? high external component tolerance; can use 5% components ? internal poweron reset forces all decoder outputs low ? operating voltage range: mc145026 = 2.5 to 18 v * mc145027, mc145028 = 4.5 to 18 v ? for infrared applications, see application note an1016/d pin assignments mc145026 encoder mc145028 decoders mc145027 decoders 13 14 15 16 9 10 11 12 5 4 3 2 1 8 7 6 c tc r tc te d out v dd a8/d8 a9/d9 r s a4 a3 a2 a1 v ss a7/d7 a6/d6 a5 13 14 15 16 9 10 11 12 5 4 3 2 1 8 7 6 d9 d8 d7 d6 v dd d in r 2 /c 2 vt a4 a3 a2 a1 v ss c 1 r 1 a5 13 14 15 16 9 10 11 12 5 4 3 2 1 8 7 6 a9 a8 a7 a6 v dd d in r 2 /c 2 vt a4 a3 a2 a1 v ss c 1 r 1 a5
semiconductor technical data p suffix plastic dip case 648 ordering information mc145026p plastic dip mc145026d sog package mc145027p plastic dip mc145027dw sog package mc145028p plastic dip mc145028dw sog package d suffix sog package case 751b dw suffix sog package case 751g 16 1 16 1 16 1
mc145026 mc145027 mc145028 motorola wireless rf, if and transmitter device data 3.2264 figure 1. mc145026 encoder block diagram te 15 ring counter and 1of9 decoder 9 8 7654321 1 2 3 4 5 6 7 9 10 r s r tc c tc 13 12 14 3pin oscillator and enable 4 divider data select and buffer d out trinary detector v dd = pin 16 v ss = pin 8 a1 a2 a3 a4 a5 a6/d6 a7/d7 a8/d8 a9/d9 11 543 21 sequencer circuit 1 2 3 4 5 a1 a2 a3 a4 a5 control logic 11 15 d6 latch vt 4bit shift register 9 d in data extractor v dd = pin 16 v ss = pin 8 c 1 c 2 r 2 r 1 76 figure 2. mc145027 decoder block diagram 10 d7 d8 d9 14 13 12
mc145026 mc145027 mc145028 motorola wireless rf, if and transmitter device data 3.2265 98 76543 21 sequencer circuit 1 2 3 4 5 15 14 13 12 a1 a2 a3 a4 a5 a6 a7 a8 a9 control logic 9bit shift register 9 d in 11 vt data extractor figure 3. mc145028 decoder block diagram v dd = pin 16 v ss = pin 8 c 1 c 2 r 2 r 1 76 10 maximum ratings* (voltages referenced to v ss ) rating symbol value unit v dd dc supply voltage (except sc41343, sc41344) 0.5 to + 18 v v dd dc supply voltage (sc41343, sc41344 only) 0.5 to + 10 v v in dc input voltage 0.5 to v dd + 0.5 v v out dc output voltage 0.5 to v dd + 0.5 v i in dc input current, per pin 10 ma i out dc output current, per pin 10 ma p d power dissipation, per package 500 mw t stg storage temperature 65 to + 150 c t l lead temperature, 1 mm from case for 10 seconds 260 c * maximum ratings are those values beyond which damage to the device may occur. func- tional operation should be restricted to the limits in the electrical characteristics tables or pin descriptions section. this device contains protection circuitry to guard against damage due to high static voltages or electric fields. however, precau- tions must be taken to avoid applications of any voltage higher than maximum rated voltages to this highimpedance circuit. for proper operation, v in and v out should be constrained to the range v ss (v in or v out ) v dd .
mc145026 mc145027 mc145028 motorola wireless rf, if and transmitter device data 3.2266 electrical characteristics e mc145026 * , mc145027, and mc145028 (voltage referenced to v ss ) guaranteed limit v dd 40 c 25 c 85 c symbol characteristic v dd v min max min max min max unit v ol lowlevel output voltage (v in = v dd or 0) 5.0 10 15 e e e 0.05 0.05 0.05 e e e 0.05 0.05 0.05 e e e 0.05 0.05 0.05 v v oh highlevel output voltage (v in = 0 or v dd ) 5.0 10 15 4.95 9.95 14.95 e e e 4.95 9.95 14.95 e e e 4.95 9.95 14.95 e e e v v il lowlevel input voltage (v out = 4.5 or 0.5 v) (v out = 9.0 or 1.0 v) (v out = 13.5 or 1.5 v) 5.0 10 15 e e e 1.5 3.0 4.0 e e e 1.5 3.0 4.0 e e e 1.5 3.0 4.0 v v ih highlevel input voltage (v out = 0.5 or 4.5 v) (v out = 1.0 or 9.0 v) (v out = 1.5 or 13.5 v) 5.0 10 15 3.5 7.0 11 e e e 3.5 7.0 11 e e e 3.5 7.0 11 e e e v i oh highlevel output current (v out = 2.5 v) (v out = 4.6 v) (v out = 9.5 v) (v out = 13.5 v) 5.0 5.0 10 15 2.5 0.52 1.3 3.6 e e e e 2.1 0.44 1.1 3.0 e e e e 1.7 0.36 0.9 2.4 e e e e ma i ol lowlevel output current (v out = 0.4 v) (v out = 0.5 v) (v out = 1.5 v) 5.0 10 15 0.52 1.3 3.6 e e e 0.44 1.1 3.0 e e e 0.36 0.9 2.4 e e e ma i in input current e te (mc145026, pullup device) 5.0 10 15 e e e e e e 3.0 16 35 11 60 120 e e e e e e m a i in input current r s (mc145026), d in (mc145027, mc145028) 15 e 0.3 e 0.3 e 1.0 m a i in input current a1 a5, a6/d6 a9/d9 (mc145026), a1 a5 (mc145027), a1 a9 (mc145028) 5.0 10 15 e e e e e e e e e 110 500 1000 e e e e e e m a c in input capacitance (v in = 0) e e e e 7.5 e e pf i dd quiescent current e mc145026 5.0 10 15 e e e e e e e e e 0.1 0.2 0.3 e e e e e e m a i dd quiescent current e mc145027, mc145028 5.0 10 15 e e e e e e e e e 50 100 150 e e e e e e m a i dd dynamic supply current e mc145026 (f c = 20 khz) 5.0 10 15 e e e e e e e e e 200 400 600 e e e e e e m a i dd dynamic supply current e mc145027, mc145028 (f c = 20 khz) 5.0 10 15 e e e e e e e e e 400 800 1200 e e e e e e m a * also see next electrical characteristics table for 2.5 v specifications.
mc145026 mc145027 mc145028 motorola wireless rf, if and transmitter device data 3.2267 electrical characteristics e mc145026 (voltage referenced to v ss ) guaranteed limit v dd 40 c 25 c 85 c symbol characteristic v dd v min max min max min max unit v ol lowlevel output voltage (v in = 0 v or v dd ) 2.5 e 0.05 e 0.05 e 0.05 v v oh highlevel output voltage (v in = 0 v or v dd ) 2.5 2.45 e 2.45 e 2.45 e v v il lowlevel input voltage (v out = 0.5 v or 2.0 v) 2.5 e 0.3 e 0.3 e 0.3 v v ih highlevel input voltage (v out = 0.5 v or 2.0 v) 2.5 2.2 e 2.2 e 2.2 e v i oh highlevel output current (v out = 1.25 v) 2.5 0.28 e 0.25 e 0.2 e ma i ol lowlevel output current (v out = 0.4 v) 2.5 0.22 e 0.2 e 0.16 e ma i in input current (te e pullup device) 2.5 e e 0.09 1.8 e e m a i in input current (a1a5, a6/d6a9/d9) 2.5 e e e 25 e e m a i dd quiescent current 2.5 e e e 0.05 e e m a i dd dynamic supply current (f c = 20 khz) 2.5 e e e 40 e e m a switching characteristics e mc145026*, mc145027, and mc145028 (c l = 50 pf, t a = 25 c) fi g ure guaranteed limit symbol characteristic figure no. v dd min max unit t tlh , t thl output transition time 4,8 5.0 10 15 e e e 200 100 80 ns t r d in rise time e decoders 5 5.0 10 15 e e e 15 15 15 m s t f d in fall time e decoders 5 5.0 10 15 e e e 15 5.0 4.0 m s f osc encoder clock frequency 6 5.0 10 15 0.001 0.001 0.001 2.0 5.0 10 mhz f decoder frequency e referenced to encoder clock 12 5.0 10 15 1.0 1.0 1.0 240 410 450 khz t w te pulse width e encoders 7 5.0 10 15 65 30 20 e e e ns * also see next switching characteristics table for 2.5 v specifications. switching characteristics e mc145026 (c l = 50 pf, t a = 25 c) fi g ure guaranteed limit symbol characteristic figure no. v dd min max unit t tlh , t thl output transition time 4, 8 2.5 e 450 ns f osc encoder clock frequency 6 2.5 1.0 250 khz t w te pulse width 7 2.5 1.5 e m s
mc145026 mc145027 mc145028 motorola wireless rf, if and transmitter device data 3.2268 10% 90% any output t tlh t thl figure 4. figure 5. figure 6. figure 7. figure 8. test circuit 10% 90% d in t f t r v dd v ss r tc 50% 1/f osc te 50% v dd v ss t w device under test * includes all probe and fixture capacitance. c l * output test point
mc145026 mc145027 mc145028 motorola wireless rf, if and transmitter device data 3.2269 operating characteristics mc145026 the encoder serially transmits trinary data as defined by the state of the a1 a5 and a6/d6 a9/d9 input pins. these pins may be in either of three states (low, high, or open) allowing 19,683 possible codes. the transmit sequence is initiated by a low level on the te input pin. upon powerup, the mc145026 can continuously transmit as long as te remains low (also, the device can transmit twoword sequences by pulsing te low). however, no mc145026 application should be designed to rely upon the first data word transmitted immediately after powerup because this word may be invalid. between the two data words, no signal is sent for three data periods (see figure 10). each transmitted trinary digit is encoded into pulses (see figure 11). a logic 0 (low) is encoded as two consecutive short pulses, a logic 1 (high) as two consecutive long pulses, and an open (high impedance) as a long pulse followed by a short pulse. the input state is determined by using a weak aoutputo device to try to force each input high then low. if only a high state results from the two tests, the input is assumed to be hardwired to v dd . if only a low state is obtained, the input is assumed to be hardwired to v ss . if both a high and a low can be forced at an input, an open is assumed and is encoded as such. the ahigho and alowo levels are 70% and 30% of the supply voltage as shown in the electrical charac- teristics table. the weak aoutputo device sinks/sources up to 110 m a at a 5 v supply level, 500 m a at 10 v, and 1 ma at 15 v. the te input has an internal pullup device so that a sim- ple switch may be used to force the input low. while te is high and the secondword transmission has timed out, the encoder is completely disabled, the oscillator is inhibited, and the current drain is reduced to quiescent current. when te is brought low, the oscillator is started and the transmit sequence begins. the inputs are then sequentially selected, and determinations are made as to the input logic states. this information is serially transmitted via the d out pin. mc145027 this decoder receives the serial data from the encoder and outputs the data, if it is valid. the transmitted data, con- sisting of two identical words, is examined bit by bit during reception. the first five trinary digits are assumed to be the address. if the received address matches the local address, the next four (data) bits are internally stored, but are not transferred to the output data latch. as the second encoded word is received, the address must again match. if a match occurs, the new data bits are checked against the previously stored data bits. if the two nibbles of data (four bits each) match, the data is transferred to the output data latch by vt and remains until new data replaces it. at the same time, the vt output pin is brought high and remains high until an error is received or until no input signal is received for four data periods (see figure 10). although the address information may be encoded in tri- nary, the data information must be either a 1 or 0. a trinary (open) data line is decoded as a logic 1. mc145028 this decoder operates in the same manner as the mc145027 except that nine address lines are used and no data output is available. the vt output is used to indicate that a valid address has been received. for transmission security, two identical transmitted words must be con- secutively received before a vt output signal is issued. the mc145028 allows 19,683 addresses when trinary lev- els are used. 512 addresses are possible when binary levels are used. pin descriptions mc145026 encoder a1 a5, a6/d6 a9/d9 address, address/data inputs (pins 1 7, 9, and 10) these address/data inputs are encoded and the data is sent serially from the encoder via the d out pin. r s , c tc , r tc (pins 11, 12, and 13) these pins are part of the oscillator section of the encoder (see figure 9). if an external signal source is used instead of the internal oscillator, it should be connected to the r s input and the r tc and c tc pins should be left open. te transmit enable (pin 14) this activelow transmit enable input initiates transmis- sion when forced low. an internal pullup device keeps this input normally high. the pullup current is specified in the electrical characteristics table. d out data out (pin 15) this is the output of the encoder that serially presents the encoded data word. v ss negative power supply (pin 8) the mostnegative supply potential. this pin is usually ground. v dd positive power supply (pin 16) the mostpositive power supply pin. mc145027 and mc145028 decoders a1 a5, a1 a9 address inputs (pins 1 5) e mc145027, address inputs (pins 1 5, 15, 14, 13, 12) e mc145028 these are the local address inputs. the states of these pins must match the appropriate encoder inputs for the vt pin to go high. the local address may be encoded with tri- nary or binary data. d6 d9 data outputs (pins 15, 14, 13, 12) e mc145027 only these outputs present the binary information that is on encoder inputs a6/d6 through a9/d9. only binary data is
mc145026 mc145027 mc145028 motorola wireless rf, if and transmitter device data 3.2270 acknowledged; a trinary open at the mc145026 encoder is decoded as a high level (logic 1). d in data in (pin 9) this pin is the serial data input to the decoder. the input voltage must be at cmos logic levels. the signal source driving this pin must be dc coupled. r 1 , c 1 resistor 1, capacitor 1 (pins 6, 7) as shown in figures 2 and 3, these pins accept a resistor and capacitor that are used to determine whether a narrow pulse or wide pulse has been received. the time constant r 1 x c 1 should be set to 1.72 encoder clock periods: r 1 c 1 = 3.95 r tc c tc r 2 /c 2 resistor 2/capacitor 2 (pin 10) as shown in figures 2 and 3, this pin accepts a resistor and capacitor that are used to detect both the end of a received word and the end of a transmission. the time constant r 2 x c 2 should be 33.5 encoder clock periods (four data periods per figure 11): r 2 c 2 = 77 r tc c tc . this time constant is used to determine whether the d in pin has remained low for four data periods (end of transmission). a separate onchip comparator looks at the voltageequiva- lent two data periods (0.4 r 2 c 2 ) to detect the dead time be- tween received words within a transmission. vt valid transmission output (pin 11) this valid transmission output goes high after the second word of an encoding sequence when the following conditions are satisfied: 1. the received addresses of both words match the local de- coder address, and 2. the received data bits of both words match. vt remains high until either a mismatch is received or no input signal is received for four data periods. v ss negative power supply (pin 8) the mostnegative supply potential. this pin is usually ground. v dd positive power supply (pin 16) the mostpositive power supply pin.
mc145026 mc145027 mc145028 motorola wireless rf, if and transmitter device data 3.2271 r s c tc r tc 11 12 13 internal enable figure 9. encoder oscillator information this oscillator operates at a frequency determined by the external rc network; i.e., f 1 2.3 r tc c tc (hz) for 1 khz f 400 khz where: c tc = c tc + c layout + 12 pf r s 2 r tc r s 20 k r tc 10 k 400 pf < c tc < 15 m f the value for r s should be chosen to be 2 times r tc . this range ensures that current through r s is insignificant compared to current through r tc . the upper limit for r s must ensure that r s x 5 pf (input capacitance) is small com- pared to r tc x c tc . for frequencies outside the indicated range, the formula is less accurate. the minimum recommended oscillation frequency of this circuit is 1 khz. sus- ceptibility to externally induced noise signals may occur for frequencies below 1 khz and/or when resistors utilized are greater than 1 m w . figure 10. timing diagram pw min te 2 word transmission encoder continuous transmission encoder oscillator (pin 12) d out (pin 15) vt (pin 11) data outputs 1.1 (r 2 c 2 ) decoder encoding sequence 1st digit high 2nd word 1st word open low 9th digit 9th digit 1st digit 2 4 6 16 18 20 22 24 26 28 30 80 82 84 86 88 90 114 116 118 120 122 178 180 182 184
mc145026 mc145027 mc145028 motorola wireless rf, if and transmitter device data 3.2272 data period encoder oscillator (pin 12) d out (pin 15) encoded aoneo encoded azeroo encoded aopeno figure 11. encoder data waveforms 500 400 300 200 100 v dd = 15 v v dd = 10 v v dd = 5 v figure 12. f max vs c layout e decoders only c layout (pf) on pins 1 5 (mc145027); pins 1 5 and 12 15 (mc145028) f (khz) (ref. to encoder clock) max 10 20 30 40 50
mc145026 mc145027 mc145028 motorola wireless rf, if and transmitter device data 3.2273 no yes figure 13. mc145027 flowchart no has the transmission begun? does this data match the previously stored data? disable vt on the 1st address mismatch disable vt on the 1st data mismatch disable vt is this at least the 2nd consecutive match since vt disable? does the 5bit address match the address pins? store the 4bit data yes yes latch data onto output pins and activate vt have 4bit times passed? has a new transmission begun? yes no no yes no yes no
mc145026 mc145027 mc145028 motorola wireless rf, if and transmitter device data 3.2274 has the transmission begun? no yes yes yes no no does the address match the address pins? disable vt on the 1st address mismatch and ignore the rest of this word disable vt is this at least the 2nd consecutive match since vt disable? activate vt have 4bit times passed? has a new transmission begun? yes yes no no figure 14. mc145028 flowchart
mc145026 mc145027 mc145028 motorola wireless rf, if and transmitter device data 3.2275 mc145027 and mc145028 timing to verify the mc145027 or mc145028 timing, check the waveforms on c1 (pin 7) and r2/c2 (pin 10) as compared to the incoming data waveform on d in (pin 9). the rc decay seen on c1 discharges down to 1/3 v dd before being reset to v dd . this point of reset (labelled adoso in figure 15) is the point in time where the decision is made whether the data seen on d in is a 1 or 0. dos should not be too close to the d in data edges or intermittent operation may occur. the other timing to be checked on the mc145027 and mc145028 is on r2/c2 (see figure 16). the rc decay is continually reset to v dd as data is being transmitted. only between words and after the endoftransmission (eot) does r2/c2 decay significantly from v dd . r2/c2 can be used to identify the internal endofword (eow) timing edge which is generated when r2/c2 decays to 2/3 v dd . the in- ternal eot timing edge occurs when r2/c2 decays to 1/3 v dd . when the waveform is being observed, the rc decay should go down between the 2/3 and 1/3 v dd levels, but not too close to either level before data transmission on d in re- sumes. verification of the timing described above should ensure a good match between the mc145026 transmitter and the mc145027 and mc145028 receivers. v dd 0 v d in v dd 2/3 1/3 0 v c1 dos dos figure 15. rc decay on pin 7 (c1) v dd 2/3 1/3 0 v r2/c2 eot figure 16. rc decay on pin 10 (r2/c2) eo w
mc145026 mc145027 mc145028 motorola wireless rf, if and transmitter device data 3.2276 v dd te 5 trinary addresses 4bit binary data a1 a2 a3 a4 a5 d6 d7 d8 d9 1 2 3 4 5 6 7 9 10 14 16 15 d out 0.1 m f mc145026 8 12 11 r tc r s v dd 13 c tc repeat of above mc145027 v dd 0.1 m f 16 d in 9 6 7 10 r2 c 2 r1 c 1 1 2 3 4 5 15 14 13 12 11 d6 d7 d8 d9 vt v dd 5 trinary addresses a1 a2 a3 a4 a5 figure 17. typical application c tc = c tc + c layout + 12 pf 100 pf c tc 15 m f r tc 10 k w ; r s 2 r tc r 1 10 k w c 1 400 pf r 2 100 k w c 2 700 pf f osc = 1 2.3 r tc c tc r 1 c 1 = 3.95 r tc c tc r 2 c 2 = 77 r tc c tc example r/c values (all resistors and capacitors are 5%) (c tc = c tc + 20 pf) f osc (khz) r tc c tc r s r 1 c 1 r 2 c 2 362 181 88.7 42.6 21.5 8.53 1.71 10 k 10 k 10 k 10 k 10 k 10 k 50 k 20 k 20 k 20 k 20 k 20 k 20 k 100 k 120 pf 240 pf 490 pf 1020 pf 2020 pf 5100 pf 5100 pf 10 k 10 k 10 k 10 k 10 k 10 k 50 k 100 k 100 k 100 k 100 k 100 k 200 k 200 k 8 910 pf 1800 pf 3900 pf 7500 pf 0.015 m f 0.02 m f 0.1 m f 470 pf 910 pf 2000 pf 3900 pf 8200 pf 0.02 m f 0.02 m f repeat of above
mc145026 mc145027 mc145028 motorola wireless rf, if and transmitter device data 3.2277 applications information infrared transmitter in figure 18, the mc145026 encoder is set to run at an os- cillator frequency of about 4 to 9 khz. thus, the time required for a complete twoword encoding sequence is about 20 to 40 ms. the data output from the encoder gates an rc oscil- lator running at 50 khz; the oscillator shown starts rapidly enough to be used in this application. when the asendo but- ton is not depressed, both the mc145026 and oscillator are in a lowpower standby state. the rc oscillator has to be trimmed for 50 khz and has some drawbacks for frequency stability. a superior system uses a ceramic resonator oscilla- tor running at 400 khz. this oscillator feeds a divider as shown in figure 19. the unused inputs of the mc14011ub must be grounded. the mled81 ired is driven with the 50 khz square wave at about 200 to 300 ma to generate the carrier. if desired, two ireds wired in series can be used (see application note an1016 for more information). the bipolar ired switch, shown in figure 18, offers two advantages over a fet. first, a logic fet has too much gate capacitance for the mc14011ub to drive without waveform distortion. second, the bipolar drive permits lower supply voltages, which are an advantage in portable batterypowered applications. the configuration shown in figure 18 operates over a supply range of 4.5 to 18 v. a lowvoltage system which operates down to 2.5 v could be realized if the oscillator sec- tion of a mc74hc4060 is used in place of the mc14011ub. the data output of the mc145026 is inverted and fed to the reset pin of the mc74hc4060. alternately, the mc74hcu04 could be used for the oscillator. information on the mc14011ub is in book number dl131/d. the mc74hcu04 and mc74hc4060 are found in book number dl129/d. infrared receiver the receiver in figure 20 couples an irsensitive diode to input preamp a1, followed by bandpass amplifier a2 with a gain of about 10. limiting stage a3 follows, with an output of about 800 mv pp. the limited 50 khz burst is detected by comparator a4 that passes only positive pulses, and peak detected and filtered by a diode/rc network to extract the data envelope from the burst. comparator a5 boosts the sig- nal to logic levels compatible with the mc145027/28 data input. the d in pin of these decoders is a standard cmos highimpedance input which must not be allowed to float. therefore, direct coupling from a5 to the decoder input is utilized. shielding should be used on at least a1 and a2, with good ground and highsensitivity circuit layout techniques applied. for operation with supplies higher than + 5 v, limiter a4's positive output swing needs to be limited to 3 to 5 v. this is accomplished via adding a zener diode in the negative feed- back path, thus avoiding excessive system noise. the bias- ing resistor stack should be adjusted such that v3 is 1.25 to 1.5 v. this system works up to a range of about 10 meters. the gains of the system may be adjusted to suit the individual design needs. the 100 w resistor in the emitter of the first 2n5088 and the 1 k w resistor feeding a2 may be altered if different gain is required. in general, more gain does not nec- essarily result in increased range. this is due to noise floor limitations. the designer should increase transmitter power and/or increase receiver aperature with fresnal lensing to greatly improve range. see application note an1016 for additional information. information on the mc34074 is in data book dl128/d. trinary switch manufacturers midland rosselectronic connector div. greyhill augat/alcoswitch aries electronics the above companies may not have the switches in a dip. for more information, call them or consult eem electronic engineers master catalog or the gold book . ask for spdt with center off . alternative: an spst can be placed in series between a spdt and the encoder or decoder to achieve trinary action. motorola cannot recommend one supplier over another and in no way suggests that this is a complete listing of tri- nary switch manufacturers.
mc145026 mc145027 mc145028 motorola wireless rf, if and transmitter device data 3.2278 10 k w 220 k w send te 9 r s c tc r tc mc145026 switches 100 k w for approx. 4 khz 47 k w for approx. 9 khz 1000 pf d out mc14011ub mc14011ub 220 k w 0.01 m f select for 200 ma to 300 ma mled81 use of 2 mled81s is optional mpsa13 or mpsw13 adjust/select for f = 50 khz (approx. 100 k w ) figure 18. ired transmitter using rc oscillator to generate carrier frequency v+ v+ 50 khz to driver transistor x1 = 400 khz ceramic resonator panasonic efda400k04b or equivalent mc14024 clk x1 470 pf mc14011ub d out from mc145026 1m w 470 pf q3 figure 19. using a ceramic resonator to generate carrier frequency reset v+ mc14011ub
mc145026 mc145027 mc145028 motorola wireless rf, if and transmitter device data 3.2279 figure 20. infrared receiver 10 m f 22 k w optical filter 10 k w 10 k w 10 k w 100 w 6.8 k w 2.2 k w 1 m f 1n914 1n914 100 k w + + + + +5 v 0.01 m f 1 k w 1 mh e toko type 7pa or 10pa or equivalent 0.01 m f 4.7 k w a2 a3 a4 a5 10 k w v1 v1 v2 1 m w 1n914 1 k w 1000 pf 47 k w 22 k w 1 m w v3 1000 pf 390 k w for approx. 4 khz 180 k w for approx. 9 khz 750 k w for approx. 4 khz 360 k w for approx. 9 khz 0.01 m f c1 r1 r2/c2 vt v ss v dd 4 9 for mc145027 5 for mc145028 address switches data out mc145027 only +5 v 10 m f 10 m f 4.7 k w 2.2 k w 390 w 2.7 k w 10 m f v2 2.7 v d in 0.01 m f 1/4 mc34074 +5 v 2n5088 2n5086 2n5088 1/4 mc34074 1/4 mc34074 1/4 mc34074 a1 v3 1.3 v v1 2.5 v mc145027/28 10 m f

▲Up To Search▲

Price & Availability of MC145028DWR2

	To Download MC145028DWR2 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .