mc145156 Lansdale Semiconductor, Inc., mc145156 Datasheet - Page 7

• Manufacturer Part Number: mc145156
• Description: Pll Frequency Synthesizer Family
• Manufacturer: Lansdale Semiconductor, Inc.

LANSDALE Semiconductor, Inc.
their respective programmed values, and the above sequence
repeated. This provides for a total programmable divide value
(NT)=N•P+A where P and P + 1 represent the dual–modulus
prescaler divide values respectively for high and low MC lev-
els, N the number programmed into the ÷ N counter, and A the
number programmed into the ÷ A counter.
LD
Lock Detector Output (Pin 28)
phase and frequency). Pulses low when loop is out of lock.
Page 7 of 35
Essentially a high level when loop is locked (f R , f V of same
NOTES:
1. Off–chip oscillator optional.
2. The φ R and φ 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 φ R and φ 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”
ML145152
NO CONNECTS
RA1
“1”
N0
A5
TYPICAL APPLICATIONS
RA0
“1”
www.lansdale.com
LD
A0
φ R
MC
φ V
f in
LOCK DETECT SIGNAL
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 V SS .
V SS
Negative Power Supply (Pin 2)
ground.
The most negative supply potential. This pin is usually-
R1
R1
R2
C
R2
–
+
MC33171
NOTE 2
C
÷ 64/65 PRESCALER
150 – 175 MHz
5 kHz STEPS
ML12017
VCO
ML145152
Issue A