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PDF DS1085L Data sheet ( Hoja de datos )
| Número de pieza | DS1085L | |
| Descripción | EconOscillator Frequency Synthesizer | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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www.maxim-ic.com
FEATURES
§ User-Programmable Frequency Synthesizer
§ Programmable From 4.1kHz to 66MHz
§ Dual Synchronous Outputs
§ 4.13MHz to 66MHz Reference Oscillator
Output
§ 4.1kHz to 66MHz Main Oscillator Output
§ Single 3.0 to 3.6V Supply
§ Three Resolution Options
§ 2-Wire Serial Interface
§ 0.75% Absolute Accuracy
§ Nonvolatile (NV) Frequency Settings
§ No External Timing Components
§ Power-Down Mode
ORDERING INFORMATION
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DEVICE
DS1085LZ-5
DS1085LZ-12
DS1085LZ-25
PACKAGE
150mil SO
150mil SO
150mil SO
STEP
SIZE
5kHz
12.5kHz
25kHz
DS1085L
3.3V EconOscillator Frequency
Synthesizer
PIN ASSIGNMENT
OUT1
OUT0
VCC
GND
18
27
36
45
SO (150mil)
SCL
SDA
CTRL1
CTRL0
PIN DESCRIPTION
OUT1
OUT0
VCC
GND
CTRL1
CTRL0
SDA
SCL
- Main Oscillator Output
- Reference Oscillator Output
- Power-Supply Voltage
- Ground
- Control Pin for OUT1
- Control Pin for OUT0
- 2-Wire Serial Data Input/Output
- 2-Wire Serial Clock
OSCILLATOR
OUTPUT RANGE
4.1kHz to 66MHz
4.1kHz to 66MHz
4.1kHz to 66MHz
DESCRIPTION
The DS1085L is a dual-output frequency synthesizer requiring no external timing components for
operation. It can be used as a standalone oscillator or as a dynamically programmed, processor-controlled
peripheral device. An internal master oscillator can be programmed from 33MHz to 66MHz with three
resolution options of 5kHz, 12.5kHz, and 25kHz. A programmable 3-bit prescaler (divide-by-1, 2, 4, or 8)
permits the generation of a reference oscillator output (OUT0) from the master, ranging from 4.13MHz to
66MHz. A second independent prescaler and a 1-to-1025 divider allow the generation of a main oscillator
output (OUT1) from 4.1kHz to 66MHz. The two outputs, although synchronous with the master, can be
independently programmed. The combination of programmable master oscillator, prescalers, and dividers
allows the generation of thousands of user-specified frequencies. All master oscillator, prescaler, and
divider settings are stored in NV (EEPROM) memory, providing a default value on power-up that allows
it to be used as a standalone oscillator. A 2-wire serial interface allows in-circuit, on-the-fly programming
of the master oscillator, prescalers (P0 and P1), and divider (N). This allows dynamic frequency
modification, if required, or, for fixed-frequency applications, the DS1085L can be used with factory- or
user-programmed values.
EconOscillator is a trademark of Dallas Semiconductor.
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021403
1 page  
DS1085L
REGISTER FUNCTIONS
The user-programmable registers can be used to determine the mode of operation (MUX), operating
frequency (DAC, OFFSET, DIV), and bus settings (ADDR). The functions of the registers are described
in this section, but the details of how these registers are programmed can be found in a later section. The
register settings are nonvolatile, with the values being stored automatically or as required in EEPROM
when the registers are programmed through the SDA and SCL pins.
DAC WORD (Address 08h)
MSB
LSB MSB
LSB
d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 X X X X X X
First Data Byte
Second Data Byte
X = Don’t care.
The DAC word (d0–d9) controls the frequency of the master oscillator. The resolution of this register
depends on the step size of the device. The absolute frequency of the device also depends on the value of
the OFFSET register (see Tables 5 and 6).
Table 5. DEVICE DEFAULT SETTINGS
DS1085LZ-5
DS1085LZ-12
Frequency DAC Offset Frequency DAC Offset
48.58MHz 500 OS
52.3MHz 600 OS
DS1085LZ-25
Frequency DAC Offset
50.9MHz
500 OS
For any given value of OFFSET the master oscillator frequency can be derived as follows:
Frequency = Min Frequency + DAC x Step Size
where: Min frequency is the lowest frequency shown in Table 6 for the corresponding offset.
DAC is the value of the DAC register (0–1023).
Step size is the step size of the device (5kHz, 12.5kHz, or 25kHz).
OS is the decimal, integer value of the 5 MSBs of the RANGE register.
OFFSET BYTE (Address 0Eh)
MSB
LSB
X X X O4 O3 O2 O1 O0
X = Don’t care.
The OFFSET byte (O0–O4) determines the range of frequencies that can be obtained within the absolute
minimum and maximum range of the oscillator. Correct operation of the device is not guaranteed for
values of OFFSET not shown in Table 6.
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5 Page 
Access RANGE [37h]
DS1085L
If R/ W is 1, the next data bytes read are the values stored in the RANGE register. This register has a 14-
bit value. The upper eight bits are sent first, followed by a second byte that contains the five LSBs of the
register value in the most significant positions of the data byte. The upper five MSB’s of the first byte
contain the OS value for the frequency adjust Table 6. The register is read-only.
Write E2 [3Fh]
If WC = 0, the EEPROM is automatically written to at the end of each write command. This is a
DEFAULT condition. In this case the command “WRITE E2” is not needed. If WC = 1, the EEPROM is
only written to when the “WRITE E2” command is issued. On receipt of the “WRITE E2” command, the
contents of the DIV and MUX registers are written into the EEPROM, thus locking in the register
settings. This is a single-byte transfer.
EXCEPTION: The ADDR register is always automatically written to EEPROM after a write, regardless
of the values of WC.
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| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet DS1085L.PDF ] | |
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