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MC145151P2 Datasheet(PDF) 4 Page - Motorola, Inc |
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MC145151P2 Datasheet(HTML) 4 Page - Motorola, Inc |
4 / 36 page ![]() MC145151–2 through MC145158–2 MOTOROLA 4 φR, φV Phase Detector B Outputs (Pins 8, 9) These phase detector outputs can be combined externally for a loop–error signal. A single–ended output is also avail- able for this purpose (see PDout). If frequency fV is greater than fR or if the phase of fV is leading, then error information is provided by φV pulsing low. φR remains essentially high. If the frequency fV is less than fR or if the phase of fV is lagging, then error information is provided by φR pulsing low. φV remains essentially high. If the frequency of fV = fR and both are in phase, then both φV and φR remain high except for a small minimum time period when both pulse low in phase. fV N Counter Output (Pin 10) This is the buffered output of the ÷ N counter that is inter- nally connected to the phase detector input. With this output available, the ÷ N counter can be used independently. LD Lock Detector Output (Pin 28) Essentially a high level when loop is locked (fR, fV of same phase and frequency). Pulses low when loop is out of lock. POWER SUPPLY VDD Positive Power Supply (Pin 3) The positive power supply potential. This pin may range from + 3 to + 9 V with respect to VSS. VSS Negative Power Supply (Pin 2) The most negative supply potential. This pin is usually ground. TYPICAL APPLICATIONS Figure 1. 5 MHz to 5.5 MHz Local Oscillator Channel Spacing = 1 kHz 0 1 1 1 0 0 0 1 0 0 0 = 5 MHz 1 0 1 0 1 1 1 1 1 0 0 = 5.5 MHz 5 – 5.5 MHz VOLTAGE CONTROLLED OSCILLATOR NC NC PDout RA0 RA1 RA2 N13 N0 N1 N2 N3 N4 N5 N6 N7 N8 N9 N10 N11 N12 MC145151–2 fin OSCout OSCin 2.048 MHz Figure 2. Synthesizer for Land Mobile Radio UHF Bands NOTES: 1. fR = 4.1667 kHz; ÷ R = 2410; 21.4 MHz low side injection during receive. 2. Frequency values shown are for the 440 – 470 MHz band. Similar implementation applies to the 406 – 440 MHz band. For 470 – 512 MHz, consider reference oscillator frequency X9 for mixer injection signal (90.3750 MHz). 60.2500 MHz “0” “1” “1” CHOICE OF DETECTOR ERROR SIGNALS LOCK DETECT SIGNAL T: 13.0833 – 18.0833 MHz R: 9.5167 – 14.5167 MHz T: 73.3333 – 78.3333 MHz R: 69.7667 – 74.7667 MHz X6 VCO LOOP FILTER DOWN MIXER X6 T/R VSS VDD CHANNEL PROGRAMMING ÷ N = 2284 TO 3484 TRANSMIT (ADDS 856 TO ÷ N VALUE) RECEIVE REF. OSC. 10.0417 MHz (ON–CHIP OSC. OPTIONAL) “1” “0” “0” fV LD RA0 RA1 RA2 OSCin OSCout MC145151–2 + V TRANSMIT: 440.0 – 470.0 MHz RECEIVE: 418.6 – 448.6 MHz (25 kHz STEPS) PDout φR fV fin MC145151–2 Data Sheet Continued on Page 23 |
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