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DS1086L Datasheet(PDF) 10 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) 10 Page - Maxim Integrated Products

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3.3V Spread-Spectrum EconOscillator
10
____________________________________________________________________
The output frequency is determined by the following
equation:
where: min frequency of selected OFFSET range is the
lowest frequency (shown in Table 2 for the correspond-
ing offset).
DAC value is the value of the DAC register (0 to 1023).
Prescaler is the value of 2x where x = 0 to 8.
See the Example Frequency Calculations section for a
more in-depth look at using the registers.
________________Register Definitions
The DS1086L registers are used to program the output
frequency, dither percent, dither rate, and 2-wire
address. Table 1 shows a summary of the registers and
detailed descriptions follow below.
PRESCALER (02h)
The PRESCALER word is a two-byte value containing
control bits for the prescaler (P3 to P0), output control
(Lo/
HiZ), the jitter rate (JS4 to JS3), as well as control
bits for the jitter percentage (JS2 to JS0). The
PRESCALER word is read and written using two-byte
reads and writes beginning at address 02h.
JS4 to JS3: Jitter Rate. This is the frequency of the tri-
angle wave generator and the modulation frequency
that the output is dithered. It can be programmed to the
master oscillator frequency, fOSC, divided by either
8192, 4096, or 2048.
JS4
JS3
JITTER RATE
00
fOSC/8192
01
fOSC/4096 (default)
10
fOSC/2048
fOUTPUT
MIN FREQUENCY OF SELECTED OFFSET RANGE
DAC VALUE
kHz STEP SIZE
PRESCALER
(
)
(
)
=
+× 5
OFFSET
FREQUENCY RANGE (MHz)
OS - 6
30.7 to 35.8
OS - 5
33.3 to 38.4
OS - 4
35.8 to 41.0
OS - 3
38.4 to 43.5
OS - 2
41.0 to 46.1
OS - 1
43.5 to 48.6
OS*
46.1 to 51.2
OS + 1
48.6 to 53.8
OS + 2
51.2 to 56.3
OS + 3
53.8 to 58.9
OS + 4
56.3 to 61.4
OS + 5
58.9 to 64.0
OS + 6
61.4 to 66.6
*Factory default setting. OS is the integer value of the five LSBs
of the RANGE register.
REGISTER
ADDR
MSB
BINARY
LSB
FACTORY
DEFAULT
ACCESS
PRESCALER
02h
JS4
JS3
JS2
JS1
JS0
LO/
HiZ
P3
P2
0110000 0
R/W
PRESCALER
P1
P0
XX
XX
XX
XX
XX
XX
00XXXXX
R/W
DAC (MSB)
08h
b9
b8
b7
b6
b5
b4
b3
b2
01111101b
R/W
DAC (LSB)
b1
b0
X0
X0
X0
X0
X0
X0
00000000b
R/W
OFFSET
0Eh
X1
X1
X1
b4
b3
b2
b1
b0
1 1 1 - - - - - b
R/W
ADDR
0Dh
X1
X1
X1
X1
WC
A2
A1
A0
11110000b
R/W
RANGE
37h
XX
XX
XX
b4
b3
b2
b1
b0
xxx- - - - - b
R
WRITE EE
3Fh
NO DATA
——
Table 1. Register Summary
X0 = Don’t care, reads as zero.
X1 = Don’t care, reads as one.
XX = Don’t care, reads indeterminate.
X = Don’t care.
Table 2. Offset Settings


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