LOW POWER FM TRANSMITTER SYSTEM

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1 Order this document by MC28/D MC28 is a onechip FM transmitter subsystem designed for cordless telephone and FM communication equipment. It includes a microphone amplifier, voltage controlled oscillator and two auxiliary transistors. Wide Range of Operating Supply Voltage ( V) Low Drain Current (ICC = 2.9 ma Typ) Low Number of External Parts Required 0 dbm Power Output to 60 MHz Using Direct RF Output + dbm Power Output Attainable Using OnChip Transistor Amplifiers Users Must Comply with Local Regulations on R.F. Transmission (FCC, DOT, P.T.T., etc) LOW POWER FM TRANITTER SYSTEM SEMICONDUCTOR TECHNICAL DATA P SUFFIX PLASTIC PACKAGE CASE 648 D SUFFIX PLASTIC PACKAGE CASE B (SO6) Representative Block Diagram PIN CONNECTIONS 2 Variable Reactance RF Osc 6 Variable Reactance Output Decoupling 2 6 RF Osc 4 Mic Amp + Buffer 2 Modulator Input Output Input Gnd Tr Emitter RF Output Tr 2 Base Tr 2 Emitter Tr 2 Collector VCC 6 Tr Base 8 9 Tr Collector VREF ORDERING INFORMATION 8 9 Device Operating Temperature Range Package MC28D MC28P TA = 0 to + C SO6 Plastic DIP Motorola, Inc. 99 MOTOROLA ANALOG IC DEVICE DATA

2 MAXIMUM RATINGS MC28 Ratings Symbol Value Unit Power Supply Voltage VCC (max) V Operating Supply Voltage Range VCC V Junction Temperature TJ + 0 C Operating Ambient Temperature TA 0 to + C Storage Temperature Range Tstg 6 to + 0 C ELECTRICAL CHARACTERISTICS (VCC = 4.0 V, TA = 2 C, unless otherwise noted) Characteristics Symbol Pin Min Typ Max Unit Drain Current (No input signal) ICC ma FM MODULATOR Output RF Voltage (fo = 6.6 MHz) Vout RF mvrms Output DC Voltage (No input signal) Vdc V Modulation Sensitivity (fo = 6.6 MHz) Modulation Sensitivity (Vin = 0.8 V to.2 V) SEN.0 Hz/mVdc Maximum Deviation (fo = 6.6 MHz) Maximum Deviation (Vin = 0 V to 2.0 V) Fdev.0.0 khz MIC AMPLIFIER Closed Loop Voltage Gain (Vin =.0 mvrms) Closed Loop Voltage Gain (fin =.0 khz) Av db Output DC Voltage (No input signal) Vout dc V Output Swing Voltage (Vin = 0 mvrms) Output Swing Voltage (fin =.0 khz) Total Harmonic Distortion (Vin =.0 mvrms) Total Harmonic Distortion (fin =.0 khz) Vout pp Vpp THD % AUXILIARY TRANSISTOR STATIC CHARACTERISTICS Characteristics Symbol Min Typ Max Unit Collector Base Breakdown Voltage (IC =.0 µa) V(BR)CBO 4 V Collector Emitter Breakdown Voltage (IC = 200 µa) V(BR)CEO V Collector Substrate Breakdown Voltage (IC = 0 µa) V(BR)CSO 0 V Emitter Base Breakdown Voltage (IE = 0 µa) V(BR)EBO 6.2 V Collector Base Cut Off Current (VCB = V) Collector Base Cut Off Current (IE = 0) ICBO 200 na DC Current Gain (IC =.0 ma) DC Current Gain (VCE =.0 V) AUXILIARY TRANSISTOR DYNAMIC CHARACTERISTICS Current Gain Bandwidth Product (VCE =.0 V) Current Gain Bandwidth Product (IC =.0 ma) Collector Base Capacitance (VCE =.0 V) Collector Base Capacitance (IC = 0) Collector Substrate Capacitance (VCS =.0 V) Collector Substrate Capacitance (IC = 0) hfe 40 0 ft 00 MHz CCB 2.0 pf CCS. pf 2 MOTOROLA ANALOG IC DEVICE DATA

3 Figure. Test Circuit Mod Out µf. µh 6.60 MHz 6 9 pf Crystal: f o = 6.60 MHz C L = 0 pf C o = 6. pf R S = Ω Max 2 68 pf Mod In RF Out Out In 220 k 6. k 4 MC28 2 Base 2 Emitter 2 6 Collector 2 Emitter Base µf 0.0 µf Collector Figure 2. Single Chip VHF Narrowband FM Transmitter Lt X Audio Input Dynamic Mike 0 k Deviation Adjust 20 k 4. k 2. k 400 p 0 k 400 p.0 µ Variable Reactance + RF Osc. Buffer Q p 6 p p L µ Cc C.0 k C2 90 k 00 p.0 k Electret (alternate) Microphone and biasing Rb Re 40 p Q 8 V REF Cc2 V CC = 9.0 Vdc 40 p 9 C L2 C4 C +.0 µf tantalum RF Output.0 to dbm (see Note 4) NOTES:. Components versus output frequency: Output RF X (MHz) Lt (µh) L (µh) L2 (µh) Re Rb Cc Cc2 C C2 C C4 C 0 MHz 6 MHz 4 MHz k 00 k 220 k p 68 p 4 p p p p p 68 p 68 p 40 p 40 p 00 p p 2 p 8 p 4 p 20 p 2 p 220 p 20 p p 2. Crystal X is fundamental mode, calibrated for parallel resonance with a 2 pf load. The final output frequency is generated by frequency multiplication within 2. the MC28 IC. The RF output buffer (Pin ) and Q2 transistor are used as a frequency tripler and doubler, respectively, in the 6 and 4 MHz transmitters. 2. The Q output transistor is a linear amplifier in the 49. MHz and 6 MHz transmitters, and a frequency doubler in the 4 MHz transmitter.. All coils used are mm shielded inductors, CoilCraft series MA, M282AM289A, M2A or equivalent. 4. Power output is + dbm for 0 MHz and 6 MHz transmitters, and +.0 dbm for the 4 MHz transmitter at V CC = 8.0 V. Power output drops with lower 4. V CC.. All capacitors in microfarads, inductors in Henries and resistors in Ohms unless otherwise specified. 6. Other frequency combinations may be setup by simple scaling of the examples shown. MOTOROLA ANALOG IC DEVICE DATA

4 Figure. Buffer/Multiplier (x, Pin ) (6 MHz Fundamental) Figure 4. Input to Doubler (Pin ) (0 MHz x Component) Figure. Doubler Output 6 MHz (Pin ) Figure 6. Spectrum 8 MHz 6 MHz Figure. Output Spectrum (0 MHz) Figure 8. Modulation Spectrum (.0 khz Showing Carrier Null) 4 db 4 MOTOROLA ANALOG IC DEVICE DATA

5 Figure 9. 4 MHz/x2 Multiplier Figure. Circuit Side View OUT GND VCC IN MC28P Figure. Ground Plane on Component Side MC28P MOTOROLA ANALOG IC DEVICE DATA

6 Figure 2. Component View 2.0 Lt X XTAL 6p p 0K 4. Kp 0K 4. Kp MC28P 4p Cc 90K C Kp.22 µ H K.0 20K Re 40p 4. K Cc2 K 40p C2 C4 C C L. Rb 2.K MC28P L2.0 NOTES: Positive artwork provided. Drill holes must be plated to ensure making all ground (V EE ) connections! Resistors labelled * are used for biasing of electret microphone if used. Capacitors labelled are silver mica. Final board size MOTOROLA ANALOG IC DEVICE DATA

7 Figure. Circuit Schematic Pin Pin 9 Pin 820 Pin 8 Pin Pin 2 k 24 k 6.8 k Pin k Pin Pin 6.8 k Pin 20 0 Pin 40 Pin6 k 8 k 8 k 4. k 8 k Pin 2.2 k k 20.2 k 9. k Pin k k 8 k 4. k 2.2 k 8 k 6 k Pin Pin 6 MOTOROLA ANALOG IC DEVICE DATA

8 OUTLINE DIMENSIONS 6 H A 8 G F 9 D 6 PL B S C K 0.2 (0.0) M T SEATING T PLANE A M P SUFFIX PLASTIC PACKAGE CASE ISSUE R J L M NOTES:. DIMENSIONING AND TOLERANCING PER ANSI Y.M, CONTROLLING DIMENSION: INCH.. DIMENSION L TO CENTER OF LEADS WHEN FORMED PARALLEL. 4. DIMENSION B DOES NOT INCLUDE MOLD FLASH.. ROUNDED CORNERS OPTIONAL. INCHES MILLIMETERS DIM MIN MAX MIN MAX A B C D F G 0.0 BSC 2.4 BSC H 0.00 BSC.2 BSC J K L M 0 0 S T SEATING PLANE G A D 6 PL K B P 8 PL 0.2 (0.0) M B S C 0.2 (0.0) M T B S A S D SUFFIX PLASTIC PACKAGE CASE B0 (SO6) ISSUE J M R X 4 J F NOTES:. DIMENSIONING AND TOLERANCING PER ANSI Y.M, CONTROLLING DIMENSION: MILLIMETER.. DIMENSIONS A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0. (0.006) PER SIDE.. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.2 (0.00) TOTAL IN EXCESS OF THE D DIMENSION AT MAXIMUM MATERIAL CONDITION. MILLIMETERS INCHES DIM MIN MAX MIN MAX A B C D F G.2 BSC 0.00 BSC J K M 0 0 P R Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. Typical parameters can and do vary in different applications. All operating parameters, including Typicals must be validated for each customer application by customer s technical experts. Motorola does not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer. How to reach us: USA / EUROPE: Motorola Literature Distribution; JAPAN: Nippon Motorola Ltd.; TatsumiSPDJLDC, Toshikatsu Otsuki, P.O. Box 2092; Phoenix, Arizona F SeibuButsuryuCenter, 2 Tatsumi KotoKu, Tokyo, Japan. 028 MFAX: TOUCHTONE (602) HONG KONG: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park, INTERNET: Ting Kok Road, Tai Po, N.T., Hong Kong MOTOROLA ANALOG IC DEVICE MC28/D DATA

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