LOW POWER FM IF SEMICONDUCTOR TECHNICAL DATA PIN CONNECTIONS. Figure 1. Representative Block Diagram ORDERING INFORMATION
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1 Order this document by MC7/D... includes Oscillator, Mixer, Limiting Amplifier, Quadrature Discriminator, Active, Squelch, Scan Control, and Mute Switch. The MC7 is designed for use in FM dual conversion communications equipment. Low Drain Current (.0 ma VCC = 6.0 Vdc) Excellent Sensitivity: Limiting Voltage (.0 db) =.0 µv (Typical) Low Number of External Parts Required Recommend MC7 for Replacement/Upgrade LOW POWER FM IF SEMICONDUCTOR TECHNICAL DATA P SUFFIX CASE 6 D SUFFIX CASE 7B (SO ) Figure. Representative Block Diagram PIN CONNECTIONS V CC. MHz Oscillator Mixer.7 MHz Ground Crystal Osc. Mixer V CC RF Gnd Audio Mute Scan Control khz 6 7 Limiter Amp Demodulator Squelch Trigger With Hysteresis Active Amp.0 V + _ Audio Mute Scan Control Noise Detector Z Z Audio Limiter Decoupling Limiter Quad 6 7 ORDERING INFORMATION Squelch Demodulator Quad Coil Device MC7D MC7P Operating Temperature Range TA = 0 to +70 C Package SO Plastic DIP MOTOROLA ANALOG IC DEVICE DATA Motorola, Inc. 6 Rev
2 MC7 MAXIMUM RATINGS (TA = C, unless otherwise noted) Rating Pin Symbol Value Unit Power Supply Voltage VCC(max) Vdc Operating Supply Voltage Range VCC to Vdc Detector Voltage.0 Vp p Voltage (VCC 6.0 Volts) V.0 VRMS Mute Function V 0. to.0 Vpk Junction Temperature TJ C Operating Ambient Temperature Range TA 0 to + 70 C Storage Temperature Range Tstg 6 to + C ELECTRICAL CHARACTERISTICS (VCC = 6.0 Vdc, fo =.7 MHz, f = ±.0 khz, fmod =.0 khz, TA = C, unless otherwise noted.) Characteristic Pin Min Typ Max Unit Drain Current Squelch Off.0 ma Drain Current Squelch On.0.0 Limiting Voltage ( db Limiting).0 µv Detector Voltage.0 Vdc Detector Impedance 00 Ω Recovered Audio Voltage (Vin = mv) 00 0 mvrms Gain ( khz) (Vin = mv) 0 6 db Voltage..0. Vdc Trigger Hysteresis 0 mv Mute Function Low 0 Ω Mute Function High.0 MΩ Scan Function Low (Mute Off) (V = Vdc) Scan Function High (Mute On) (V = Gnd) 0 0. Vdc.0 Vdc Mixer Conversion Gain 0 db Mixer Resistance. kω Mixer Capacitance. pf MOTOROLA ANALOG IC DEVICE DATA
3 MC7 V CC = 6.0 Vdc Figure. Test Circuit 0. µf. MHz 0 pf 0 pf 0 nf.7 MHz.0 k murata CFU D khz k k.0 Vdc 0 nf.0 k 0 nf 6 Op Amp 7 k 7 0 k.0 k.0 µf + In k 0 pf pf. k 0.0 µf Audio Out L P =.0 mh C P = 0 pf R P = 0 kω CIRCUIT DESCRIPTION The MC7 is a low power FM IF circuit designed primarily for use in voice communication scanning receivers. The mixer oscillator combination converts the input frequency (e.g.,.7 MHz) down to khz, where, after external bandpass filtering, most of the amplification is done. The audio is recovered using a conventional quadrature FM detector. The absence of an input signal is indicated by the presence of noise above the desired audio frequencies. This noise band is monitored by an active filter and a detector. A squelch trigger circuit indicates the presence of a noise (or a tone) by an output which can be used to control scanning. At the same time, an internal switch is operated which can be used to mute the audio. The oscillator is an internally biased Colpitts type with the collector, base, and emitter connections at Pins,, and respectively. A crystal can be used in place of the usual coil. The mixer is doubly balanced to reduce spurious responses. The input impedance at Pin is set by a.0 kω internal biasing resistor and has low capacitance, allowing the circuit to be preceded by a crystal filter. The collector output at Pin must be dc connected to B +, below which it can swing 0. V. After suitable bandpass filtering (ceramic or LC), the signal goes to the input of a five stage limiter at Pin. The output of the limiter at Pin 7 drives a multiplier, both internally directly, and externally through a quadrature coil, to detect the FM. The output at Pin 7 is also used to supply dc feedback to Pin. The other side of the first limiter stage is decoupled at Pin 6. The recovered audio is partially filtered, then buffered, giving an impedance of around 00 Ω at Pin. The signal still requires de emphasis, volume control and further amplification before driving a loudspeaker. A simple inverting op amp is provided with an output at Pin providing dc bias (externally) to the input at Pin which is referred internally to.0 V. A filter can be made with external impedance elements to discriminate between frequencies. With an external AM detector, the filtered audio signal can be checked for the presence of noise above the normal audio band, or a tone signal. This information is applied to Pin. An external positive bias to Pin sets up the squelch trigger circuit such that Pin is low at an impedance level of around 60 kω, and the audio mute (Pin ) is open circuit. If Pin is pulled down to 0.7 V by the noise or tone detector, Pin will rise to approximately 0. Vdc below supply where it can support a load current of around 00 µa and Pin is internally short circuited to ground. There is 0 mv of hysteresis at Pin to prevent jitter. Audio muting is accomplished by connecting Pin to a high impedance ground reference point in the audio path between Pin and the audio amplifier. MOTOROLA ANALOG IC DEVICE DATA
4 MC7 k 0 k 0 k 7 0 Figure. Circuit Schematic k k 0 k 0 k 0 k 0.0 k 0 k 7 k 0 k 0 k.0 k 0 k 0 k k C k k k k k k k k k k k k k k k k 0 k k 6 0 k 0 k k k k 70 0 k 0 k 0 C k MOTOROLA ANALOG IC DEVICE DATA
5 MC7 OUTLINE DIMENSIONS P SUFFIX CASE 6 0 ISSUE R H A G F D PL B S C K 0. (0.0) M T SEATING T PLANE A M J L M NOTES:. DIMENSIONING AND TOLERANCING PER ANSI Y.M,.. CONTROLLING DIMENSION: INCH.. DIMENSION L TO CENTER OF LEADS WHEN FORMED PARALLEL.. 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. BSC H 0.00 BSC.7 BSC J K L M 0 0 S A D SUFFIX CASE 7B 0 (SO ) ISSUE J T SEATING PLANE G K B D PL 0. (0.0) M T B S A S P PL 0. (0.0) M B S C M R X J F NOTES:. DIMENSIONING AND TOLERANCING PER ANSI Y.M,.. CONTROLLING DIMENSION: MILLIMETER.. DIMENSIONS A AND B DO NOT INCLUDE MOLD PROTRUSION.. MAXIMUM MOLD PROTRUSION 0. (0.006) PER SIDE.. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.7 (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.7 BSC 0.00 BSC J K M P R MOTOROLA ANALOG IC DEVICE DATA
6 MC7 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 which may be provided in Motorola data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. 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 / Locations Not Listed: Motorola Literature Distribution; JAPAN: Nippon Motorola Ltd.; Tatsumi SPD JLDC, 6F Seibu Butsuryu Center, P.O. Box 0; Phoenix, Arizona or 60 0 Tatsumi Koto Ku, Tokyo, Japan. 0 MFAX: RMFAX0@ .sps.mot.com TOUCHTONE ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; B Tai Ping Industrial Park, INTERNET: NET.com Ting Kok Road, Tai Po, N.T., Hong Kong MOTOROLA ANALOG IC DEVICE MC7/D DATA
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