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MC12429 データシート(PDF) 4 Page - Motorola, Inc

部品番号. MC12429
部品情報  HIGH FREQUENCY CLOCK SYNTHESIZER
ダウンロード  12 Pages
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メーカー  MOTOROLA [Motorola, Inc]
ホームページ  http://www.freescale.com
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MC12429 Datasheet(HTML) 4 Page - Motorola, Inc

 
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MC12429
MOTOROLA
TIMING SOLUTIONS
4
9–BIT SR
2–BIT SR
3–BIT SR
DIV 16
Figure 3. MC12429 Block Diagram (28–Lead PLCC Pinout)
16MHz
S_LOAD
P_LOAD
S_DATA
S_CLOCK
XTAL1
XTAL2
OSC
4
5
PHASE
DETECTOR
28
7
9–BIT DIV M
COUNTER
LATCH
VCO
DIV N
(1, 2, 4, 8)
LATCH
200–400
MHz
FOUT
FOUT
+3.3 or 5.0V
25
24
23
VCC0
LATCH
TEST
20
+3.3 or 5.0V
PLL_VCC
1MHz
FREF
01
27
26
01
VCC1
+3.3 or 5.0V
M[8:0]
9
8
16
N[1:0]
2
17, 18
21
22, 19
OE
6
PROGRAMMING INTERFACE
Programming the device amounts to properly configuring
the internal dividers to produce the desired frequency at the
outputs. The output frequency can by represented by this
formula:
FOUT = (FXTAL ÷ 16) x M ÷ N
(1)
Where FXTAL is the crystal frequency, M is the loop divider
modulus, and N is the output divider modulus. Note that it is
possible to select values of M such that the PLL is unable to
achieve loop lock. To avoid this, always make sure that M is
selected to be 200
≤ M ≤ 400 for a 16MHz input reference.
Assuming that a 16MHz reference frequency is used the
above equation reduces to:
FOUT = M
÷ N
Substituting the four values for N (1, 2, 4, 8) yields:
TABLE A: Output Frequency Range
N
FOUT
OUTPUT FREQUENCY RANGE
1
2
4
8
M
M / 2
M / 4
M / 8
200 – 400 MHZ
100 – 200 MHZ
50 – 100 MHZ
25 – 50 MHZ
From these ranges the user will establish the value of N
required, then the value of M can be calculated based on the
appropriate equation above. For example if an output
frequency of 131MHz was desired the following steps would
be taken to identify the appropriate M and N values. 131MHz
falls within the frequency range set by an N value of 2 so N
[1:0] = 01. For N = 2 FOUT = M
÷ 2 and M = 2 x FOUT.
Therefore M = 131 x 2 = 262, so M[8:0] = 100000110.
Following this same procedure a user can generate any
whole frequency desired between 25 and 400MHz. Note that
for N > 2 fractional values of FOUT can be realized. The size
of the programmable frequency steps (and thus the indicator
of the fractional output frequencies acheivable) will be equal
to FXTAL
÷ 16 ÷ N.
For input reference frequencies other than 16MHz the set
of appropriate equations can be deduced from equation 1.
For computer applications another useful frequency base
would be 16.666MHz. From this reference one can generate
a family of output frequencies at multiples of the 33.333MHz
PCI clock. As an example to generate a 133.333MHz clock
from a 16.666MHz reference the following M and N values
would be used:
FOUT = 16.666
÷ 16 x M ÷ N = 1.0416 x M ÷ N


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