DS1086LU-12F+T Maxim Integrated Products, DS1086LU-12F+T Datasheet - Page 10
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DS1086LU-12F+T
Manufacturer Part Number
DS1086LU-12F+T
Description
IC ECONOSILL 3.3V SS 8-USOP
Manufacturer
Maxim Integrated Products
Series
EconOscillator™r
Type
Spread Spectrum Clock Generatorr
Datasheet
1.DS1086LU-533.pdf
(16 pages)
Specifications of DS1086LU-12F+T
Pll
No
Input
Clock
Output
Clock
Number Of Circuits
1
Ratio - Input:output
2:1
Differential - Input:output
No/No
Frequency - Max
24.576MHz
Divider/multiplier
Yes/No
Voltage - Supply
2.7 V ~ 3.6 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Frequency-max
-
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 2
3.3V Spread-Spectrum EconOscillator
Table 1. Register Summary
X
X
X
X = Don’t care.
Table 2. Offset Settings
* Factory default setting. OS is the integer value of the five LSBs
of the RANGE register.
10
PRESCALER
PRESCALER
DAC (MSB)
DAC (LSB)
OFFSET
ADDR
RANGE
WRITE EE
0
1
X
f
OUTPUT
REGISTER
= Don’t care, reads as zero.
= Don’t care, reads as one.
= Don’t care, reads indeterminate.
______________________________________________________________________________________
OFFSET
OS + 1
OS + 2
OS + 3
OS + 4
OS + 5
OS + 6
OS - 6
OS - 5
OS - 4
OS - 3
OS - 2
OS - 1
OS*
=
(
MIN FREQUENCY OF SELECTED OFFSET RANGE
ADDR
0Dh
02h
08h
0Eh
37h
3Fh
—
—
+
(
DAC VALUE
FREQUENCY RANGE (MHz)
MSB
JS4
x
P1
b9
b1
X
X
X
1
1
X
where x = 0 to 8.
PRESCALER
30.74 to 35.86
33.30 to 38.42
35.86 to 40.98
38.42 to 43.54
40.98 to 46.10
43.54 to 48.66
46.10 to 51.22
48.66 to 53.78
51.22 to 56.34
53.78 to 58.90
56.34 to 61.46
58.90 to 64.02
61.46 to 66.58
× 5
JS3
P0
b0
X
b8
X
X
kHz STEP SIZE
X
1
1
JS2
X
b7
X
X
X
X
X
0
1
1
X
)
JS1
X
b6
X
b4
X
b4
NO DATA
X
0
1
BINARY
)
JS0
WC
b5
b3
b3
X
X
X
0
See the Example Frequency Calculations section for a
more in-depth look at using the registers.
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.
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, f
8192, 4096, or 2048.
LO/HiZ
________________Register Definitions
JS4
b4
b2
A2
b2
X
X
0
0
1
X
0
JS3
P3
X
b3
X
b1
A1
b1
0
1
0
X
0
LSB
P2
X
b2
b0
A0
b0
X
X
0
f
OSC
JITTER RATE
f
f
/4096 (default)
OSC
OSC
01111101b
00000000b
11110000b
FACTORY
0 1 1 0 0 0 0 0
1 1 1 - - - - - b
0 0 X X X X X
x x x - - - - - b
DEFAULT
/8192
/2048
—
OSC
PRESCALER (02h)
, divided by either
ACCESS
R/W
R/W
R/W
R/W
R/W
R/W
—
R