If frequency f is greater than f or if the phase of f is
REF
out
V
R
V
leading, then error information is provided by φ pulsing low.
Buffered Reference Oscillator Output (Pin 14)
V
φ
remains essentially high.
R
This output can be used as a second local oscillator, refer-
ence oscillator to another frequency synthesizer, or as the
system clock to a microprocessor controller.
If the frequency f is less than f or if the phase of f is
V
R
V
lagging, then error information is provided by φ pulsing low.
R
φ
remains essentially high.
V
If the frequency of f = f and both are in phase, then both
S/R
out
V
R
φ
and φ remain high except for a small minimum time
Shift Register Output (Pin 12)
V
R
period when both pulse low in phase.
This output can be connected to an external shift register
to provide band switching, control information, and counter
programming code checking.
f , f
R
V
R Counter Output, N Counter Output (Pins 13, 3)
Buffered, divided reference and f frequency outputs. The
in
R
counter outputs respectively, allowing the counters to be
used independently, as well as monitoring the phase detector
inputs.
POWER SUPPLY
f
and f outputs are connected internally to the ÷ R and ÷ N
V
V
DD
Positive Power Supply (Pin 4)
The positive power supply potential. This pin may range
from +3 to +9 V with respect to V
.
SS
LD
V
Lock Detector Output (Pin 7)
SS
Negative Power Supply (Pin 6)
This output is essentially at a high level when the loop is
locked (f , f of same phase and frequency), and pulses low
when loop is out of lock.
The most negative supply potential. This pin is usually
ground.
R V
MC145157–2 Data Sheet Continued on Page 23
MOTOROLA
MC145151–2 through MC145158–2
19
MOTOROLA [ MOTOROLA ]
