MC145151 Motorola, MC145151 Datasheet - Page 7

• Manufacturer Part Number: MC145151
• Description: Parallel-Input PLL Frequency Synthesizer
• Manufacturer: Motorola

portion of the cycle). MC is then set back low, the counters
preset to their respective programmed values, and the above
sequence repeated. This provides for a total programmable
divide value (N T ) = N P + A where P and P + 1 represent the
dual–modulus prescaler divide values respectively for high
and low MC levels, N the number programmed into the
counter, and A the number programmed into the
LD
Lock Detector Output (Pin 28)
phase and frequency). Pulses low when loop is out of lock.
MOTOROLA
Essentially a high level when loop is locked (f R , f V of same
NOTES:
1. Off–chip oscillator optional.
2. The R and V outputs are fed to an external combiner/loop filter. See the Phase–Locked Loop — Low–Pass Filter
10.24 MHz
NOTE 1
+ V
Design page for additional information. The R and V outputs swing rail–to–rail. Therefore, the user should be careful
not to exceed the common mode input range of the op amp used in the combiner/loop filter.
OSC in
V DD
V SS
N9
OSC out
CHANNEL PROGRAMMING
Figure 1. Synthesizer for Land Mobile Radio VHF Bands
RA2
“1”
MC145152–2
NO CONNECTS
RA1
“1”
N0
A5
TYPICAL APPLICATIONS
RA0
“1”
A counter.
LD
N
MC
A0
f in
R
V
LOCK DETECT SIGNAL
POWER SUPPLY
V DD
Positive Power Supply (Pin 3)
from + 3 to + 9 V with respect to V SS .
V SS
Negative Power Supply (Pin 2)
ground.
The positive power supply potential. This pin may range
The most negative supply potential. This pin is usually
R1
R1
R2
C
R2
–
+
MC145151–2 through MC145158–2
MC33171
NOTE 2
C
64/65 PRESCALER
150 – 175 MHz
5 kHz STEPS
MC12017
VCO
7