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PDF 145106P Data sheet ( Hoja de datos )

Número de pieza 145106P
Descripción MC145106P
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MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
PLL Frequency Synthesizer
CMOS
The MC145106 is a phase–locked loop (PLL) frequency synthesizer
constructed in CMOS on a single monolithic structure. This synthesizer finds
applications in such areas as CB and FM transceivers. The device contains an
oscillator/amplifier, a 210 or 211 divider chain for the oscillator signal, a
programmable divider chain for the input signal, and a phase detector. The
MC145106 has circuitry for a 10.24 MHz oscillator or may operate with an
external signal. The circuit provides a 5.12 MHz output signal, which can be
used for frequency tripling. A 29 programmable divider divides the input signal
frequency for channel selection. The inputs to the programmable divider are
standard ground–to–supply binary signals. Pull–down resistors on these inputs
normally set these inputs to ground enabling these programmable inputs to be
controlled from a mechanical switch or electronic circuitry.
The phase detector may control a VCO and yields a high level signal when
input frequency is low, and a low level signal when input frequency is high. An
out–of–lock signal is provided from the on–chip lock detector with a “0” level for
the out–of–lock condition.
Single Power Supply
Wide Supply Range: 4.5 to 12 V
Provision for 10.24 MHz Crystal Oscillator
5.12 MHz Output
Programmable Division Binary Input Selects up to 29
On–Chip Pull–Down Resistors on Programmable Divider Inputs
Selectable Reference Divider, 210 or 211 (Including ÷ 2)
Three–State Phase Detector
See Application Note AN535 and Article Reprint AR254
Chip Complexity: 880 FETs or 220 Equivalent Gates
See the MC145151–2 and MC145152–2 for Higher Performance and
Added Flexibility
Order this document
by MC145106/D
MC145106
18
1
20
1
P SUFFIX
PLASTIC DIP
CASE 707
DW SUFFIX
SOG PACKAGE
CASE 751D
ORDERING INFORMATION
MC145106P
Plastic DIP
MC145106DW SOG Package
OSCout
OSCin
fin
BLOCK DIAGRAM
÷ 2out
÷2
FS
REFERENCE
DIVIDE 29 OR 210
DIVIDE–BY–N COUNTER 29 – 1
PHASE
DETECTOR
φDetout
LD
P0 P1 P2 P3 P4 P5 P6 P7 P8
REV 3
1/98
©MCMo1to4ro5la1,0In6c. 1998
1
MOTOROLA
Free Datasheet http://www.datasheet4u.com/

1 page




145106P pdf
PLL SYNTHESIZER APPLICATIONS
The MC145106 is well suited for applications in CB radios
because of the channelized frequency requirements. A typi-
cal 40 channel CB transceiver synthesizer, using a single
crystal reference, is shown in Figure 3 for receiver IF values
of 10.695 MHz and 455 kHz.
In addition to applications in CB radios, the MC145106 can
be used as a synthesizer for several other systems. Various
frequency spectrums can be achieved through the use of
proper offset, prescaling, and loop programming techniques.
In general, 300 – 400 channels can be synthesized using a
single loop, with many additional channels available when
multiple loop approaches are employed. Figures 4 and 5 are
examples of some possibilities.
In the aircraft synthesizer of Figure 5, the VHF loop (top)
will provide a 50 kHz, 360 channel system with 10.7 MHz
R/T offset when only the 11.0500 MHz (transmit) and
12.1200 MHz (receive) frequencies are provided to mixer #1.
When these signals are provided with crystal oscillators, the
result is a three crystal 360 channel, 50 kHz step synthesizer.
When using the offset loop (bottom) in Figure 5 to provide the
indicated injection frequencies for mixer #1 (two for transmit
and two for receive) 360 additional channels are possible.
This results in a 720–channel, 25 kHz step synthesizer which
requires only two crystals and provides R/T offset capability.
The receive offset value is determined by the 11.31 MHz
crystal frequency and is 10.7 MHz for the example.
The VHF marine synthesizer in Figure 4 depicts a single
loop approach for FM transceivers. The VCO operates on fre-
quency during transmit and is offset downward during re-
ceive. The offset corresponds to the receive IF (10.7 MHz) for
channels having identical receive/transmit frequencies (sim-
plex), and is (10.7 – 4.6 = 6.1) MHz for duplex channels. Car-
rier modulation is introduced in the loop during transmit.
10.24
MHz
÷ 29/210
OSC ÷ 2
MC145106 5.0 kHz
PROGRAMMABLE
DIVIDER
PHASE
DETECTOR
LD
LOOP
FILTER
26.965 – 27.405 MHz
VCO BUFFER
(TRANSMIT)
26.510 – 26.950 MHz
(RECEIVE)
SWITCH WAFERS
VDD GND
R/T
BUFFER
MIXER
1.365 – 1.805 MHz (TRANSMIT)
10.24 MHz
16.270 – 16.710 MHz
0.91 – 1.35 MHz (RECEIVE)
TO RECEIVER
RECEIVER 1ST
2ND MIXER LOCAL OSC SIGNAL
25.6 MHz
X 5 MIXER
Figure 3. Single Crystal CB Synthesizer Featuring On–Frequency VCO During Transmit
MC145106
5
MOTOROLA
Free Datasheet http://www.datasheet4u.com/

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