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DS1086L Datasheet(PDF) 13 Page - Maxim Integrated Products

Part No. DS1086L
Description  3.3V Spread-Spectrum EconOscillator
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

DS1086L Datasheet(HTML) 13 Page - Maxim Integrated Products

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3.3V Spread-Spectrum EconOscillator
____________________________________________________________________
13
The expected output frequency is not exactly equal to the
desired frequency of 11.0592MHz. The difference is
450Hz. In terms of percentage, Equation 6 shows that the
expected error is 0.004%. The expected error assumes
typical values and does not include deviations from the
typical as specified in the electrical tables.
Example #2: Calculate the register values needed to
generate a desired output frequency of 50MHz.
Since the desired frequency is already within the valid
master oscillator frequency range, the prescaler is set
to divide by 1, and hence, PRESCALER = 0000h
(currently ignoring the other setting).
fMASTER OSCILLATOR = 50.0MHz x 20 = 50.0MHz
Next, looking at Table 2, OS + 1 provides a range of
frequencies centered around the desired frequency. To
determine what value to write to the OFFSET register,
the RANGE register must first be read. Assuming 12h
was read in this example, 13h (OS + 1) is written to the
OFFSET register.
Finally, the DAC value is calculated as shown in
Equation 8.
The result is then converted to hex (0118h) and then
left-shifted, resulting in 4600h to be programmed into
the DAC register.
In summary, the DS1086L is programmed as follows:
PRESCALER = 0000h
OFFSET = OS + 1 or 13h (if RANGE was read as 12h)
DAC = 4600h
Since the expected output frequency is equal to the
desired frequency, the calculated error is 0%.
f
MHz
kHz
MHz
MHz
OUTPUT
(.
)
(
)
.
.
=
=
=
48 6
280
5
2
50 0
1
50 0
0
DAC VALUE
MHz
MHz
kHz STEP SIZE
decimal
(.
.
)
.
(
)
=
=
50 0
48 6
5
280 00
%
%
.
.
.
.
.%
ERROR
ff
f
ERROR
MHz
MHz
MHz
Hz
MHz
EXPECTED
DESIRED
EXPECTED
DESIRED
EXPECTED
=
×
=
×
=
100
11 0592
11 05875
11 0592
100
450
11 0592
100
0 004
STOP
CONDITION
OR REPEATED
START
CONDITION
REPEATED IF MORE BYTES
ARE TRANSFERRED
ACK
START
CONDITION
ACK
ACKNOWLEDGEMENT
SIGNAL FROM RECEIVER
ACKNOWLEDGEMENT
SIGNAL FROM RECEIVER
SLAVE ADDRESS
MSB
SCL
SDA
R/W
DIRECTION
BIT
12
6
7
8
9
12
8
9
3–7
Figure 4. 2-Wire Data Transfer Protocol
(6)
(7)
(8)
(9)


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