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ML145157 bảng dữ liệu(PDF) 4 Page - LANSDALE Semiconductor Inc.

tên linh kiện ML145157
Giải thích chi tiết về linh kiện  PLL Frequency Synthesizer Family
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ML145157 bảng dữ liệu(HTML) 4 Page - LANSDALE Semiconductor Inc.

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Issue A
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 available 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 peri-
od 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.
LANSDALE Semiconductor, Inc.
ML145151
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
ML145151
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
ML145151
+ V
TRANSMIT: 440.0 – 470.0 MHz
RECEIVE: 418.6 – 448.6 MHz
(25 kHz STEPS)
PDout
φR
fV
fin
ML145151 Data Sheet Continued on Page 23


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