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MC13027P Datasheet(PDF) 11 Page - Motorola, Inc |
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MC13027P Datasheet(HTML) 11 Page - Motorola, Inc |
11 / 28 page MC13027 MC13122 11 MOTOROLA ANALOG IC DEVICE DATA MC13027 PIN FUNCTION DESCRIPTION (continued) Description Pin Internal Equivalent Circuit Name 8 VCC 8 VCC VCC Supply Voltage The normal operating voltage range is 6.0 to 10 V. 9 VCLO 9 VCC VCLO 4.0 V 1.5 k Voltage Control Local Oscillator The oscillator is a cross coupled negative resistance type and this pin must be connected through a low dc resistance to Pin 4, the 4.0 V regulator. Normally, this would be the secondary of the oscillator coil. The impedance of the secondary winding should be around 2.8 k Ω to guarantee that the oscillator will run. It operates at 4 times the LO frequency: fosc = 4(Fin+FIF). 10 LO Out 10 VCC 390 LO Out Local Oscillator Output This is an emitter follower for LO output to drive a synthesizer. It is a square wave output, the internal series resistance and allows a small bypass to reduce high frequency harmonics. 12 RF Blank 12 100 k RF Blk RF Blanker An unbiased NPN acts as a SHUNT impedance when turned on. The 100 k resistor provides a dc path for the capacitor. 13 Gnd2 13 Gnd IF Ground Pin 13 is the ground for the IF section and the timing and switching circuits in the blanker. In the application circuit this should be common to the MC13122 ground. 14 IF In 16 VCC 4.0 V 220 Ω IF Out 2.2 k IF Input A degenerated differential amplifier internally biased to 4.0 V. The IF input impedance is approximately 1.8 k to match a ceramic filter. The IF amplifier is used as a buffer between the ceramic filter and the detector coil and has a fixed gain determined by the impedance of the output coil. 16 IF Out 14 3.4 k 3.4 k IF In IF Output An open collector provides high–impedance drive to the MC13122; the IF gain is set by the ac impedance on this pin. 15 RF Time 15 4.0 V 10 k RF Blk Time RF Blank Time A resistor to ground sets the RF blanking time. The time is set to the minimum required to attenuate the pulse received. This is normally longest at the low end of the band. The value is best approved by ear. A fixed value can be chosen for production. (50 µs is typical.) |
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