φ , φ
nally connected to the phase detector input. With this output
available, the ÷ N counter can be used independently.
R
V
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-
LD
Lock Detector Output (Pin 28)
able for this purpose (see PD
).
out
If frequency f is greater than f or if the phase of f is
Essentially a high level when loop is locked (f , f of same
R V
phase and frequency). Pulses low when loop is out of lock.
V
R
V
leading, then error information is provided by φ pulsing low.
V
φ
R
remains essentially high.
POWER SUPPLY
If the frequency f is less than f or if the phase of f is
V
R
V
V
lagging, then error information is provided by φ pulsing low.
DD
R
Positive Power Supply (Pin 3)
φ
V
remains essentially high.
If the frequency of f = f and both are in phase, then both
The positive power supply potential. This pin may range
from + 3 to + 9 V with respect to V
V
R
φ
V
and φ remain high except for a small minimum time
.
R
SS
period when both pulse low in phase.
V
SS
Negative Power Supply (Pin 2)
f
V
N Counter Output (Pin 10)
The most negative supply potential. This pin is usually
ground.
This is the buffered output of the ÷ N counter that is inter-
TYPICAL APPLICATIONS
2.048 MHz
NC
NC
OSC
in
OSC
out
f
RA2 RA1
RA0
PD
in
VOLTAGE
CONTROLLED
OSCILLATOR
MC145151–2
out
N13 N12 N11 N10 N9 N8 N7 N6 N5 N4 N3 N2 N1 N0
5 – 5.5 MHz
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
Figure 1. 5 MHz to 5.5 MHz Local Oscillator Channel Spacing = 1 kHz
LOCK DETECT SIGNAL
TRANSMIT: 440.0 – 470.0 MHz
RECEIVE: 418.6 – 448.6 MHz
(25 kHz STEPS)
“1”
“1”
“0”
CHOICE OF
DETECTOR
ERROR
OSC
RA2
RA1
RA0
LD
f
V
out
SIGNALS
PD
out
OSC
in
LOOP
FILTER
φ
VCO
X6
+ V
R
V
V
DD
SS
MC145151–2
f
V
REF. OSC.
10.0417 MHz
(ON–CHIP OSC.
OPTIONAL)
f
in
T: 73.3333 – 78.3333 MHz
R: 69.7667 – 74.7667 MHz
T/R
T: 13.0833 – 18.0833 MHz
R: 9.5167 – 14.5167 MHz
DOWN
MIXER
“0” “0” “1”
CHANNEL PROGRAMMING
N = 2284 TO 3484
RECEIVE
÷
TRANSMIT
(ADDS 856 TO
N VALUE)
÷
X6
60.2500 MHz
NOTES:
1. f = 4.1667 kHz; ÷ R = 2410; 21.4 MHz low side injection during receive.
R
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).
Figure 2. Synthesizer for Land Mobile Radio UHF Bands
MC145151–2 Data Sheet Continued on Page 23
MC145151–2 through MC145158–2
4
MOTOROLA
MOTOROLA [ MOTOROLA ]
