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DS1086L Datasheet(PDF) 11 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) 11 Page - Maxim Integrated Products

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3.3V Spread-Spectrum EconOscillator
____________________________________________________________________
11
JS2 to JS0: Jitter Percentage. These three bits select
the amount of jitter in percent. The SPRD pin must be a
logic high for the jitter to be enabled. Bit combinations
not shown are reserved.
Lo/HiZ: Output Low or High-Z. This bit determines the
state of the output pin when the device is in power-
down mode or when the output is disabled. If Lo/
HiZ =
0, the output is
HiZ when in power-down or disabled. If
Lo/
HiZ = 1, the output is held low when in power-down
or disabled.
P3 to P0: Prescaler Divider. These bits divide the
master oscillator frequency by 2x, where x is P3 to P0
and can be from 0 to 8. Any prescaler value entered
greater than 8 decodes as 8.
DAC (08h)
B9 to B0: DAC Setting. The DAC word sets the master
oscillator frequency to a specific value within the cur-
rent offset range. Each step of the DAC changes the
master oscillator frequency by 5kHz. The DAC word is
read and written using two-byte reads and writes
beginning at address 08h.
OFFSET (0Eh)
B4 to B0: Offset. This value selects the master oscilla-
tor frequency range that can be generated by varying
the DAC word. Valid frequency ranges are shown in
Table 2. Correct operation of the device is not guaran-
teed for values of OFFSET not shown in the table.
The default offset value (OS) is factory trimmed and
can vary from device to device. Therefore, to change
frequency range, OS must be read so the new offset
value can be calculated relative to the default. For
example, to generate a master oscillator frequency
within the largest range (61.4MHz to 66.6MHz), Table 2
indicates that the OFFSET must be programmed to OS
+ 6. This is done by reading the RANGE register and
adding 6 to the value of bits B4 to B0. The result is then
written into bits B4 to B0 of the OFFSET register.
Additional examples are provided in the Example
Frequency Calculations section.
RANGE (37h)
B4 to B0: Range: This read-only, factory programmed
value is a copy of the factory default offset (OS). OS is
required to program new master oscillator frequencies
shown in Table 2. The read-only backup is important
because the offset register is EEPROM and is likely to
be overwritten.
ADDR (0Dh)
WC: EEPROM Write Control Bit. The WC bit
enables/disables the automatic writing of registers to
EEPROM. This prevents EEPROM wear out and elimi-
nates the EEPROM write cycle time. If WC = 0 (default),
register writes are automatically written to EEPROM. If
WC = 1, register writes are stored in SRAM and only
written into EEPROM when the user sends a WRITE EE
command. If power is cycled to the device, then the
last value stored in EEPROM is recalled. WC = 1 is
ideal for applications that frequently modify the fre-
quency/registers.
Regardless of the value of the WC bit, the value of the
ADDR register is always written immediately to EEPROM.
A2 to A0: Device Address Bits. These bits determine
the 2-wire slave address of the device. They allow up to
eight devices to be attached to the same 2-wire bus
and to be addressed individually.
WRITE EE Command (3Fh)
This command can be used when WC = 1 (see the WC
bit in ADDR register) to transfer all registers from SRAM
into EEPROM. The time required to store the values is
one EEPROM write cycle time. This command is not
needed if WC = 0.
JS2
JS1
JS0
JITTER %
000
0.5
001
1
010
2
100
4
111
8


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