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MC145162P1 Datenblatt(PDF) 11 Page - Motorola, Inc

Teilenummer MC145162P1
Bauteilbeschribung  60MHZ AND 85 MHZ UNIVERSAL PROGRAMMABLE DUAL PLL FREQUENCY SYNTHESIZERS
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Hersteller  MOTOROLA [Motorola, Inc]
Direct Link  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

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MC145162
•MC145162–1
MOTOROLA
11
ADin
CLK
ENB
Figure 15. Programming Format for Transmit and Receive Counters
(4–Pin Interfacing Scheme)
16–BIT Tx COUNTER
DIVDE RATIO
Din
16–BIT Rx COUNTER
DIVIDE RATIO
NOTE: ENB must be low during the serial transfer.
LAST
CLOCK
Table 3. Global CT–1 Reference Frequency Setting vs Channel Frequencies
Country
Channels Frequency
fR1
fR2
U.S.A.
46/49 MHz (10, 15, 25 Channels)
5.0 kHz
France
26/41 MHz
6.25 kHz/12.5 kHz
Spain
31/41 MHz
5.0 kHz
Australia
30/39 MHz
5.0 kHz
U.K.
1.7/47 MHz
6.25 kHz
1.0 kHz
New Zealand
1.7/34/40 MHz
6.25 kHz
1.0 kHz
REFERENCE FREQUENCY SELECTION
AND PROGRAMMING
Figure 16 shows the bit function of the reference frequency
programming word. The user can either select the “fixed”
reference frequency for all channels accordingly or provide a
specific reference frequency for a particular channel by using
two reference frequency counters (e.g., for an application in
France, the base set transmit channel common fixed refer-
ence frequency is 6.25 kHz or 12.5 kHz). (See Table 3 and
Figure 6 for reference frequencies for various countries.)
However, transmit channels 6, 8, and 14 can be set to
25 kHz, and channel 8 reference frequency can be set to
50 kHz. But this reference frequency may not be applied to
the receiving side; therefore, the receiving side reference fre-
quency must be generated by another reference frequency
counter. The higher the reference frequency, the better the
phase noise performance and faster the lock time, but the
PLL consumes more current if both reference frequency
counters are in operation.
In general, the 12–bit reference frequency counter plus the
4 and25 module can offer all the reference frequencies
for global CT–1 transmit and receive channel requirements.
Users can select their own reference frequency by intro-
ducing the additional 14–bit auxiliary reference frequency
counter.
Again, the 14–bit auxiliary reference frequency counter can
be shut down by the auxiliary reference enable bit in the refer-
ence counter programming word by setting the bit to 0. At this
state, the fR2 is automatically connected to point C (the25
block output), and fR1 can be connected to point A or B by set-
ting the fR1–S1 and fR1–S2 bits in the reference counter pro-
gram word. The 14–bit auxiliary reference frequency counter
data will be in “Don’t Care” state.
If the 14–bit auxiliary reference frequency counter is
enabled (auxiliary reference enable = 1), then fR2 is auto-
matically connected to point D (14–bit counter output), and
fR1 can be selected to connect to point A, B, or C, depending
on the bit setting of fR1–S1 and fR1–S2.
Table 4 and Figure 16 describe the functions of the auxiliary
reference enable bit and the fR1–S1 and fR1–S2 bits
selection.


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