MC13175 FM/AM Transmitter MC13175 MC13176 chip FM/AM transmitter

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MC13175 FM/AM Transmitter MC13175 MC13176 chip FM/AM transmitter

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MC13175 FM/AM Transmitter
MC13175 MC13176 chip FM/AM transmitter subsystems designed AM/FM communication systems. They include Colpitts crystal reference oscillator, oscillator, (MC13175) (MC13176) prescaler phase detector forming versatile system. Targeted applications band band covered Title Part Other applications include local oscillator sources receivers, video transmitters, Local Area Networks (LANs), high frequency clock drivers. MC13175/76 offer following features: Current Controlled Oscillator
MC13176
FM/AM TRANSMITTER
SEMICONDUCTOR TECHNICAL DATA
Uses Easily Available Overtone Fundamental Crystals Reference Fewer External Parts Required Operating Supply Voltage (1.8 Vdc) Supply Drain Currents Power Output Adjustable dBm) Differential Output Loop Antenna Balun Transformer Networks Power Down Feature Modulated Switching Output (MC13175) fref; (MC13176) fref
SUFFIX PLASTIC PACKAGE CASE 751B (SO-16)
Figure Typical Application Transmitter
Modulator Tank
0.165µ
1.3k 0.01µ
CONNECTIONS
Coilcraft 150-05J08
150p RFout
Imod
0.1µ 150p
RFC1
Enable Reg. Xtalb
1.0k
0.1µ
ICont PDout Xtale
100p (MC13176)
(MC13175)
MC13175-30p MC13176-180p MC13175 Crystal Overtone 40.0000
0.01µ 0.82µ 1.0k
MC13176 Crystal Fundamental
ORDERING INFORMATION
Device MC13175D MC13176D Operating Temperature Range +85°C Package SO-16 SO-16
NOTES:
coaxial balun, 1/10 wavelength equals inches. Pins ground connected which component/DC ground plane side PCB. These pins must decoupled VCC; decoupling capacitors should placed close possible pins. crystal oscillator circuit adjusted frequency with variable inductor (MC13175); recommended source Coilcraft "slot seven" tuneable inductor, Part #7M3-821. 1.0k resistor. Shunting crystal prevents from oscillating fundamental mode.
Motorola, Inc. 1996
MOTOROLA ANALOG DEVICE DATA
MC13175 MC13176
MAXIMUM RATINGS 25°C, unless otherwise noted.)
Rating Power Supply Voltage Operating Supply Voltage Range Junction Temperature Operating Ambient Temperature Storage Temperature Symbol Tstg Value (max) +150 +150 Unit
ELECTRICAL CHARACTERISTICS (Figure Vdc, 25°C, unless otherwise noted.)*
Characteristic Supply Current (Power down: Supply Current (Enable [Pin thru Total Supply Current (Transmit Mode) (Imod MHz) Differential Output Power MHz; Vref [Pin mVp-p; fref) Imod (see Figure Imod Hold-in Range fref MC13175 (see Figure MC13176 (see Figure Phase Detector Output Error Current MC13175 MC13176 Oscillator Enable Time (see Figure 22b) Amplitude Modulation Bandwidth (see Figure Spurious Outputs (Imod Spurious Outputs (Imod Maximum Divider Input Frequency Maximum Output Frequency
testing purposes, ground (see Figure
Symbol IEE1 IEE2 IEE3 Pout
Unit
lerror tenable BWAM Pson Psoff fdiv
Figure Test Circuit
Imod Tank Coilcraft 150-03J0 0.098µ 0.1µ 0.1µ Ireg. enable 0.01µ RFout 0.01µ 0.1µ RFout
0.1µ
(MC13176)
(MC13175)
2.2k
MC13175-30p MC13176-33p
0.01µ 0.82µ MC13176 Crystal Fundamental
NOTES: ground; while negative with respect ground. Pins brought circuit side plated through holes. They connected together with trace each decoupled (ground). Recommended source Coilcraft "slot seven" inductor, part number 7M3-821.
MC13175 1.0k Crystal Overtone
MOTOROLA ANALOG DEVICE DATA
MC13175 MC13176
FUNCTION DESCRIPTIONS
Symbol Internal Equivalent Circuit Description/External Circuit Requirements Inputs oscillator current controlled type. external oscillator coil connected Pins which forms parallel resonance tank circuit with internal capacitance with parasitic capacitance board. Three base-emitter capacitances series configuration form capacitance parallel tank. These base-emitters Pins base-emitter differential amplifier. equivalent series capacitance differential amplifier varied modulating current from frequency control circuit (see internal circuit). more thorough discussion found Applications Information section.
Subcon
Supply Ground (VEE) layout, ground pins (also applies Pins should connected directly chassis ground. Decoupling capacitors should placed directly ground returns.
ICont
Frequency Control Vdc, voltage approximately 1.55 Vdc. oscillator current controlled error current from phase detector. This current amplified drive current source oscillator section which controls frequency oscillator. Figures show fosc versus ICont, Figure shows fosc versus ICont 40°C, 25°C 85°C MHz. modulated shown Figure MC13176 Transmitter. detailed discussion found Applications Information section.
ICont
PDout 4.0k
4.0k
PDout
Phase Detector Output phase detector provides keep locked desired carrier frequency. output impedance phase detector approximately Under closed loop conditions there voltage which dependent upon free running oscillator reference oscillator frequencies. circuitry between Pins should selected adequate loop filtering necessary stabilize filter loop response. pass filtering between needed that corner frequency well below divider reference oscillator frequencies, high enough allow fast response keep loop locked. Refer Applications Information section regarding loop filtering modulation.
MOTOROLA ANALOG DEVICE DATA
MC13175 MC13176
FUNCTION DESCRIPTIONS
Symbol Xtale Internal Equivalent Circuit Description/External Circuit Requirements Crystal Oscillator Inputs internal reference oscillator configured common emitter Colpitts. operated with either fundamental overtone crystal depending carrier frequency internal prescaler. Crystal oscillator circuits specifications crystals discussed detail applications section. With Vdc, voltage approximately approximately Vdc. 1000 mVp-p should present Colpitts biased additional drive acquired increasing bias approximately from ground. Regulator Ground additional ground provided enhance stability system. Decoupling ground) essential; should done ground return 5.0p Enable Enable Device Enable potential approximately 1.25 Vdc. When open, transmitter disabled power down mode draws less than also open (i.e., current driving it). enable transmitter current source provided. Figures show relationship between ICC, Ireg. enable. Note that flat approximately Ireg. enable (Imod Supply Voltage (VCC) operating supply voltage range from Vdc. layout, trace must kept wide possible minimize inductive reactances along trace; best have completely fill around surface mount components traces circuit side PCB.
Xtalb
Xtalb
8.0k
4.0k
Xtale
Reg.
Subcon 8.0k Reg. 2.4k
Out_Gnd Imod
Differential Output output configured differentially easily drive loop antenna. using transformer balun, shown application schematic, device then drive unbalanced impedance load. Figure shows much Output Power Free-Running Oscillator Frequency change with temperature Vdc; Imod Output Ground This additional ground provides direct access output ground circuit board VEE. Modulation/Power Output Level voltage this with current source active. external resistor chosen provide source current depending desired output power level given VCC. Figure shows relationship Power Output Modulation Current, Imod. Vdc, power output acquired with about ICC. modulation, used desired output power level described above. modulation, modulation signal must ride positive bias offset which sets static (modulation off) modulation current. External circuitry various schemes further discussed Applications Information section.
Imod
Out_Gnd
MOTOROLA ANALOG DEVICE DATA
MC13175 MC13176
Figure Supply Current versus Supply Voltage
SUPPLY CURRENT (mA) VCC, SUPPLY VOLTAGE (Vdc) Ireg. enable Imod SUPPLY CURRENT (mA)
Figure Supply Current versus Regulator Enable Current
Imod
Ireg. enable, REGULATOR ENABLE CURRENT (µA)
1000
Figure Change Oscillator Frequency versus Oscillator Control Current
OSCILLATOR FREQUENCY (MHz) OSCILLATOR FREQUENCY (MHz) ICont, OSCILLATOR CONTROL CURRENT (µA) Imod (ICont Free-Running Oscillator -1.0
Figure Change Oscillator Frequency Output Power versus Ambient Temperature
fosc OUTPUT POWER (dBm) Imod (ICont 25°C) Free-Running Oscillator AMBIENT TEMPERATURE (°C)
REFERENCE OSCILLATOR FREQUENCY (MHz)
41.0 40.8 40.6 40.4 40.2 40.0 39.8 39.6 Imod Imod Closed Loop Response: fref Vref mVp-p
REFERENCE OSCILLATOR FREQUENCY (MHz)
Figure MC13175 Reference Oscillator Frequency versus Phase Detector Current
Figure MC13176 Reference Oscillator Frequency versus Phase Detector Current
Closed Loop Response: fref Vref mVp-p
10.3
10.2 10.1 Imod 35.5
Imod -1.1
PHASE DETECTOR CURRENT (µA)
PHASE DETECTOR CURRENT (µA)
MOTOROLA ANALOG DEVICE DATA
MC13175 MC13176
Figure Change Oscillator Frequency versus Oscillator Control Current
OSCILLATOR FREQUENCY (MHz) -100 Imod fosc (ICont OSCILLATOR FREQUENCY (MHz) -100 Imod fosc (ICont
Figure Change Oscillator Frequency versus Oscillator Control Current
ICont, OSCILLATOR CONTROL CURRENT (µA)
ICont, OSCILLATOR CONTROL CURRENT (µA)
APPLICATIONS INFORMATION
Evaluation Board evaluation PCB, shown Figures very versatile intended used across entire useful frequency range this device. center section board provides area attaching components circuit side radial leaded components component ground side (see Figures 29). Additionally, peripheral area surrounding core provides pads supporting interface circuitry particular application dictates. This evaluation board will discussed referenced this section. Current Controlled Oscillator (Pins critical keep interconnect leads from (Pins external inductor symmetrical equal length. With minimum inductor, maximum free running frequency greater than GHz. Since this inductor will small, either microstrip inductor, wound inductor tuneable coil. wound inductor tuned spreading windings, whereas tuneable coils tuned adjusting position aluminum core threaded coilform. aluminum core coupling windings increased, inductance decreased. temperature coefficient using aluminum core better than ferrite core. UniCoilinductors made Coilcraft obtained with aluminum cores (Part 51-129-169). Ground (Pins Ground Returns: best take grounds backside ground plane plated through holes eyelets pins. application layout implements this technique. Note that grounds located less than mils from devices pins. Decoupling: Decoupling each ground isolates each section device reducing interaction between sections localizing circulating currents. Loop Characteristics (Pins Figure component block diagram MC1317XD system where loop characteristics described gain constants. Access individual components this system limited, inasmuch loop only pinned phase detector output frequency control input CCO. However, this allows characterization gain constants these loop components. gain constants well defined MC13175 MC13176. Phase Detector (Pin With loop lock, difference frequency output phase detector voltage that function phase difference. sinusoidal type detector used this following transfer characteristic: gain factor phase detector, (with loop lock) specified ratio output current, phase error, Ie/e (Amps/radians) radians; thus, (Amps/radians) Figures show that detector current approximately where loop loses lock radians; therefore, µA/radians. Current Controlled Oscillator, (Pin Figures show non-linear change frequency oscillator over extended range control current applications. ranges from approximately 6.3x105 rad/sec/µA kHz/µA (Figure 8.8x105 rad/sec/µA kHz/µA (Figure over relatively linear response control current µA). oscillator gain factor depends operating range control current (i.e., slope constant). Included gain factor internal amplifier which sink source least input current from phase detector. internal circuitry limits control current source capability while sink capability exceeds shown Figures Further information follow shows full capabilities addition external loop amplifier filter (see Figure 15). This additional circuitry yields 0.145 MHz/µA 9.1x105 rad/sec/µA.
MOTOROLA ANALOG DEVICE DATA
MC13175 MC13176
Figure Block Diagram MC1317XD
i(s) Pins
Phase Detector µA/rad fo/N
e(s)
Pass Filter
n(s) o(s)/N
Amplifier Current Controlled Oscillator 0.91Mrad/sec/µA Pins 13,14
Divider MC13175 MC13176 o(s)
Where:
Phase detector gain constant µA/rad; µA/rad Filter transfer function 1/N; MC13175 1/N; MC13176 gain constant rad/sec/µA rad/sec/µA
Loop Filtering fundamental loop characteristics, such capture range, loop bandwidth, lock-up time transient response controlled externally loop filtering. natural frequency damping factor important transient response step input phase frequency. given lock time, determined from plot shown Figure
0.707 lock time then 5.0/t krad/sec. loop filter take form simple pass filter lag-lead filter which creates additional pole origin loop transfer function. This additional pole along with that provides pure integrators (1/s2). lag-lead pass network shown Figure values pass filtering parameters determine loop constants equations related loop filter transfer functions F(s) t2s/1 t2)s. Figure Lag-Lead Pass Filter
Figure Type Second Order Response
(t), NORMALIZED OUTPUT RESPONSE
closed loop transfer function takes form order pass filter given H(s) KvF(s)/s KvF(s) From control theory, loop filter characteristic F(0) gain closed loop, defined KpKoKn transfer function natural frequency, (Kv/t1 t2)1/2 damping factor, (n/2) 1/Kv) Rewriting above equations solving MC13176 with 0.707 rad/sec: KpKoKn (30) (0.91 106) (1/32) 0.853 Kv/n2 0.853 106/(25 106) 34.1 (0.707)/(5 103) 0.283 (Kv/n2) (34.1 0.283) 33.8
MOTOROLA ANALOG DEVICE DATA
MC13175 MC13176
0.47 then, t1/C 33.8 10-3/0.47 10-6 -3/0.47 dthus, t2/C 0.283 10-6 0.60 above example, following standard value components used,
measurement hold-in range (i.e. fref Since cannot exceed ±1.0, approaches hold-in range equal loop gain, above example, 27.3 Mrad/sec 4.35 Extended Hold-in Range hold-in range about 3.4% could cause problems over temperature cases where free-running oscillator drifts more than because relatively high temperature coefficients ferrite tuned inductor. This problem might worsen lower frequency applications where external tuning coil large compared internal capacitance Pins improve hold-in range performance, apparent that gain factors involved must carefully considered. either MC13175 1/32 MC13176. fixed internally cannot altered. Figures suggest that there capability greater control range with more current swing. However, this swing must symmetrical about center dynamic response. suggested zero current operating point ±100 swing about offset point. External loop amplification will necessary since phase detector only supplies
0.47 defined output impedance phase detector.) Since output phase detector high impedance (~50 serves current source, input frequency control, impedance (impedance diode ground approximately imperative that second order pass filter design above modified. order minimize loading shunt network, higher impedance must established simple solution achieved adding pass network between passive second order network input This helps minimize loading effects second order pass while further suppressing sideband spurs crystal oscillator. pass filter with 1500 corner frequency (fc) kHz; reference sideband spurs down greater than dBc.
where, KpKoKn.
Figure Modified Pass Loop Filter
0.47 1.0k 1500p
Hold-In Range hold-in range, also called lock range, tracking range synchronization range, ability frequency, track input reference signal, fref gradually shifted away from free running frequency, Assuming that capable sufficient frequency deviation that internal loop amplifier filter overdriven, will track until phase error, approaches radians. Figures through direct
design example Figure external resistor (R5) (3.0 Vdc) provides approximately current boost supplement existing internal source current. (1.0 selected approximately across with selected potential base 2N4402 approximately emitter 1.55 when error current approximately zero chosen reduce level crystal sidebands.
Figure External Loop Amplifier
3.0Vdc 30µA 4.7k 1.0k 2N4402 1.6V 50µA Oscillator Control Circuitry
30µA Phase Detector Output
1000p
MOTOROLA ANALOG DEVICE DATA
MC13175 MC13176
Figure shows improved hold-in range loop. fref moved with over swing control current improved hold-in range ±15.2 95.46 Mrad/sec. 0.159/RC; 7.55 krad/sec application example Figure transmitter demonstrates capabilities high value series resistor (100 sets current source drive modulation section chip. value dependent peak peak level encoding data maximum desired frequency deviation. data input coupled with large coupling capacitor which selected modulating frequency. component placements circuit side ground side board shown Figures respectively. Figure illustrates input data modulating signal Vp-p. Figures depict deviation resulting modulation spectrum showing carrier null dBc. Figure shows unmodulated carrier power output Vdc. voice applications using dynamic electret microphone, used amplify microphone's level output. microphone amplifier circuit shown Figure Figure shows application example NBFM audio direct which reference crystal oscillator modulated.
Data Input
REFERENCE OSCILLATOR FREQUENCY (MHz)
Figure MC13176 Reference Oscillator Frequency versus Oscillator Control Current
Closed Loop Response: fref Pout Imod Vref mVp-p
10.6 10.4 10.2 -150
-100 OSCILLATOR CONTROL CURRENT (µA)
Lock-in Range/Capture Range signal applied loop equal free running frequency, then loop will capture lock-in signal making (i.e. initial frequency difference great). lock-in range expressed Modulation Noise external loop (phase detector input) minimized narrowing bandwidth. This noise minimal system since reference frequency usually derived from crystal oscillator. achieved applying modulation current superimposed control current CCO. loop bandwidth must narrow enough prevent loop from responding modulation frequency components, thus, allowing deviate frequency. loop bandwidth related natural frequency lag-lead design example where natural frequency, krad/sec damping factor, 0.707, loop bandwidth 1.64 kHz. Characterization data closed loop responses both MC13175 MC13176 (Figures respectively) show satisfactory performance using only simple low-pass loop filter network. loop filter response strongly influenced high output impedance push-pull current output phase detector.
Figure Microphone Amplifier
3.3k
100k 120k 3.9k MC33171
Voice Input Electret Microphone
1.0k
Data Audio Output
Local Oscillator Application reduce internal loop noise, relatively wide loop bandwidth needed that loop tracks cancels noise. This emphasized reduce inherent divider noise noise produced mechanical shock environmental vibrations. local oscillator application divider noise should reduced proper selection natural frequency loop. Additional pass filtering output will likely necessary reduce crystal sideband spurs minimal level.
MOTOROLA ANALOG DEVICE DATA
MC13175 MC13176
Figure 17a. MC13176D Transmitter
Level Adjust
Tank 1.1k
0.047µ RFC1
5.0k
Coilcraft 146-04J08
0.146µ
510p f/32
Output Antenna
0.1µ 9.1k 1.0k 2N4402 100k
0.47µ
130k
0.47µ
Data Input (1.6 Vp-p)
220p
Crystal Fundamental
NOTES: coaxial balun, inches long. Pins grounds connnected which component's side ground plane. These pins must decoupled VCC; decoupling capacitors should placed close possible pins. RFC1 Coilcraft surface mount inductor Coilcraft 146-05J08. Recommended source Coilcraft "slot seven" tuneable inductor, part #7M3-682. crystal parallel resonant, fundamental mode calibrated with load capacitance.
Figure 17b. NBFM Transmitter
Level Adjust
Tank 1.0k
0.047µ RFC1
5.0k
Coilcraft 146-04J08
0.146µ 4700p 0.1µ 9.1k 1.0k 2N4402
External Loop
UT-034 470p f/32
Output Antenna
(3.6 Lithium Battery)
130k 6.2k
100p 180p
Crystal Fundamental 10MHz
0.47µ RFC2 RFC3 1.0k 0.01µ
MMBV432L
NOTES: coaxial balun, inches long. Pins grounds connnected which component's side ground plane. These pins must decoupled VCC; decoupling capacitors should placed close possible pins. RFC1 Coilcraft surface mount inductor. RFC2 RFC3 high impedance crystal frequency MHz; molded inductor gives 1000 single varactor like MV2105 used whereby RFC2 needed. crystal parallel resonant, fundamental mode calibrated with load capacitance.
Audio Data Input
MOTOROLA ANALOG DEVICE DATA
MC13175 MC13176
Figure 18a. Input Data Waveform Figure 18b. Frequency Deviation
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Figure 18c. Modulation Spectrum
Figure 18d. Unmodulated Carrier
Reference Crystal Oscillator (Pins Selection Proper Crystal: crystal operate number mechanical modes. lowest resonant frequency mode fundamental while higher order modes called overtones. each mechanical resonance, crystal behaves like series-tuned circuit having large inductor high inductor series resonance with dynamic capacitor, determined elasticity crystal lattice series resistance which accounts power dissipated heating crystal. This series circuit parallel with static capacitance, which created crystal block metal plates leads that make contact with Figure equivalent circuit crystal single resonant mode. assumed that other modes resonance frequency that their effects negligible. Series resonant frequency, given 1/2(LsCs)1/2 parallel resonant frequency, given fs(1 Cs/Cp)1/2
Figure Crystal Equivalent Circuit
frequency separation resonance given fp-fs fs[1 Cs/Cp)1/2] Usually less than higher than crystal exhibits extremely wide variation reactance with frequency between crystal oscillator circuit very stable with frequency. This high rate change impedance with frequency stabilizes oscillator, because significant change oscillator frequency will cause large phase shift feedback loop keeping oscillator frequency.
MOTOROLA ANALOG DEVICE DATA
MC13175 MC13176
Manufacturers specify crystal either series parallel resonant operation. frequency parallel mode calibrated with specified shunt capacitance called "load capacitance." most common value load capacitance placed series with crystal, equivalent circuit will series resonance specified parallel-resonant frequency. Frequencies parallel resonant crystal operating fundamental mode, while above about MHz, series resonant crystal specified calibrated operation overtone mode used. Application Examples types crystal oscillator circuits used applications circuits: fundamental mode common emitter Colpitts (Figures 17a, 17b, 21), third overtone impedance inversion Colpitts (also Figures 21). fundamental mode common emitter Colpitts uses parallel resonant crystal calibrated with load capacitance. capacitance values chosen provide excellent frequency stability output power mVp-p Figures fundamental mode reference oscillator fixed tuned relying repeatability crystal passive network maintain frequency, while circuit shown Figure oscillator frequency adjusted with variable inductor precise operating frequency. third overtone impedance inversion Colpitts uses series resonance crystal with tolerance. application examples (Figures 21), reference oscillator operates with third overtone crystal 40.0000 MHz. Thus, MC13175 operated (fo/8 crystal; 320/8 40.0000 MHz. resistor across crystal ensures that crystal will operate series resonant mode. tuneable inductor used adjust oscillation frequency; forms parallel resonant circuit with series parallel combination external capacitors forming divider feedback network base-emitter capacitance device. crystal shorted, reference oscillator should free-run frequency dictated parallel resonant network. reference oscillator operated high with third overtone crystal. Therefore, possible MC13175 least MC13176 (based maximum capability divider network). Enable (Pin enabling resistor calculated Reg. enable Vdc/Ireg. enable From Figure Ireg. enable chosen Rreg. enable 26.6 standard value resistor adequate. Layout Considerations Supply (Pin 12): layout, trace must kept wide possible minimize inductive reactance along trace; best that ground) completely fills around surface mounted components interconnect traces circuit side board. This technique demonstrated evaluation board. Battery/Selection/Lithium Types device operated from lithium battery. Selection suitable battery important. Because major problems long life battery powered equipment oxidation battery terminals, battery mounted clip-in socket advised. battery leads contact post should isolated from eliminate oxide build-up. battery should have board mounting tabs which soldered PCB. Consideration should given peak current capability battery. Lithium batteries have current handling capabilities based composition lithium compound, construction battery size. 1300 mA/hr rating achieved lithium-manganese dioxide battery crimp sealed, spiral wound Vdc, 1300 mA/hr cylindrical cell with board mounting tabs. excellent choice based capacity size (1.358 long 0.665 diameter). Differential Output (Pins availability micro-coaxial cable small baluns surface mount radial-leaded components allows simple interface output ports. loop antenna directly connected with bias resistors. Antenna configuration will vary depending space available frequency operation. Modulation (Pin Amplitude Shift Key: MC13175 MC13176 designed accommodate Amplitude Shift Keying (ASK). modulation form digital modulation corresponding amplitude carrier switched between more values response code. binary case, usual choice On-Off Keying (often abbreviated OOK). resultant amplitude modulated waveform consists pulses called marks, representing binary spaces representing binary
MOTOROLA ANALOG DEVICE DATA
MC13175 MC13176
Figure Application Circuit
Rmod 3.3k 0.165µ 150p 1.0k RFC1 0.1µ 0.01µ 150p RFOut
Tank Coilcraft 150-05J08
On-Off Keyed Input Level
0.1µ
100p (MC13176)
(MC13175)
MC13175-30p MC13176-180p 0.82µ MC13175 Crystal 1.0k Overtone 40.0000
0.01µ MC13176 Crystal Fundamental
NOTES: coaxial balun, 1/10 wavelength line (1.5) provides best match load. Pins ground connnected which component/DC ground plane side PCB. These pins must decoupled VCC; decoupling capacitors should placed close possible pins. crystal oscillator circuit adjusted frequency with variable inductor (MC13175); resistor shunting crystal prevents from oscillating fundamental mode. Recommended source Coilcraft "slot seven" tuneable inductor, part #7M3-821.
On-Off keyed signal turns output transmitter with level pulses through Rmod "On" power resistor which sets Imod VTTL Rmod. (see Figure 23). simulates enable gate pulse from microprocessor which will enable transmitter. (see Figure determine precise value enabling resistor based potential gate pulse desired enable.)
Figure shows typical application which output power been reduced linearity current drain. current draw device (average) 22.5 (average power output) using modulating rate on-off keying. This equates "On", "Off". Figure 22a, device's modulating waveform encoded carrier
displayed. crystal oscillator enable time needed acquisition timing. takes typically msec reach full magnitude oscillator waveform (see Figure 22b, Oscillator Waveform, square waveform peak with period that greater than oscillator enable time applied Enable (Pin 11).
MOTOROLA ANALOG DEVICE DATA
MC13175 MC13176
Figure 22a. Input Waveform Modulated Carrier
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Figure 22b. Oscillator Enable Time, Tenable
Figure
Figure Power Output versus Modulation Current
POWER OUTPUT (dBm)
Imod, MODULATION CURRENT (mA)
Analog analog applications, output amplifier's linearity must carefully considered. Figure plot Power Output versus Modulation Current MHz, Vdc. order achieve linear encoding modulating sinusoidal waveform carrier, modulating signal must amplitude modulate carrier linear portion power output response. When using sinewave modulating signal, signal rides positive offset called Vmod which sets static (modulation off) modulation current, Imod. Imod controls power output modulating signal moves around this static bias point modulating current varies causing power output vary modulated. When operated modulation current levels greater than mAdc differential output stage starts saturate.
MOTOROLA ANALOG DEVICE DATA
MC13175 MC13176
design example, shown Figure operating point selected tradeoff between average power output quality Vdc; 18.5 Imod mAdc static offset 1.04 Vdc, circuit shown Figure completes design. Figures 25a, show results output power 100% modulation modulating sinewave signals. amplitude input signals approximately mVp-p. Where Rmod (VCC 1.04 Vdc)/0.5 3.92 standard value resistor Figure Analog Transmitter
3.9k 1.04Vdc Rmod 3.0Vdc 0.8Vdc Data Input 800mVp-p 6.8µ
Figure 25a. Power Output Unmodulated Carrier
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Figure
Figure 25b. Input Signal Modulated Carrier fmod
Figure 25c. Input Signal Modulated Carrier fmod
MOTOROLA ANALOG DEVICE DATA
MC13175 MC13176
Figure Circuit Side View MC1317XD
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Figure Ground Side View
MOTOROLA ANALOG DEVICE DATA
MC13175 MC13176
Figure Surface Mounted Components Placement Circuit Side)
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Figure Radial Leaded Components Placement Ground Side)
MOTOROLA ANALOG DEVICE DATA
MC13175 MC13176
OUTLINE DIMENSIONS
SUFFIX PLASTIC PACKAGE CASE 751B (SO-16)
NOTES: DIMENSIONING TOLERANCING ANSI Y14.5M, 1982. CONTROLLING DIMENSION: MILLIMETER. DIMENSION INCLUDE MOLD PROTRUSION. MAXIMUM MOLD PROTRUSION 0.15 (0.006) SIDE. 751B-01 OBSOLETE, STANDARD 751B-03. MILLIMETERS 9.80 10.00 3.80 4.00 1.35 1.75 0.35 0.49 0.40 1.25 1.27 0.19 0.25 0.10 0.25 5.80 6.20 0.25 0.50 INCHES 0.386 0.393 0.150 0.157 0.054 0.068 0.014 0.019 0.016 0.049 0.050 0.008 0.009 0.004 0.009 0.229 0.244 0.010 0.019
0.25 (0.010)
0.25 (0.010)
SEATING PLANE
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MOTOROLA ANALOG DEVICE DATA
*MC13175/D*
MC13175/D

MC13175 FM/AM Transmitter MC13175 MC13176 chip FM/AM transmitter

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