DS1085Z-50 Maxim Integrated Products, DS1085Z-50 Datasheet

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DS1085Z-50

Manufacturer Part Number
DS1085Z-50
Description
Timers & Support Products EconOscillator Frequ requency Synthesizer
Manufacturer
Maxim Integrated Products
Datasheet
ORDERING INFORMATION
DESCRIPTION
The DS1085 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 66MHz to 133MHz with three
resolution options of 10kHz, 25kHz, and 50kHz. 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 8.2MHz to
133MHz. A second independent prescaler and a 1-to-1025 divider allows the generation of a main
oscillator output (OUT1) from 8.1kHz to 133MHz. 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 DS1085 can be
used with factory- or user-programmed values.
FEATURES
§ User-Programmable Frequency Synthesizer
§ Programmable From 8.1kHz to 133MHz
§ Dual Synchronous Outputs
§ 8.2MHz to 133MHz Reference Oscillator
§ 8.1kHz to 133MHz Main Oscillator Output
§ Three Resolution Options
§ 2-Wire Serial Interface
§ 0.75% Absolute Accuracy
§ Nonvolatile (NV) Frequency Settings
§ Single 5V Supply
§ No External Timing Components
§ Power-Down Mode
www.maxim-ic.com
EconOscillator is a trademark of Dallas Semiconductor.
DS1085Z-10
DS1085Z-25
DS1085Z-50
Output
DEVICE
PACKAGE
150mil SO
150mil SO
150mil SO
10kHz
25kHz
50kHz
STEP
SIZE
1 of 21
OUTPUT RANGE
8.1kHz to 133MHz
8.1kHz to 133MHz
8.1kHz to 133MHz
OSCILLATOR
PIN ASSIGNMENT
PIN DESCRIPTION
OUT1
OUT0
V
GND
CTRL1
CTRL0
SDA
SCL
EconOscillator Frequency Synthesizer
CC
OUT0
OUT1
GND
V
CC
- 2-Wire Serial Clock
SO (150mil)
- Main Oscillator Output
- Reference Oscillator Output
- Power-Supply Voltage
- Ground
- Control Pin for OUT1
- Control Pin for OUT0
- 2-Wire Serial Data Input/Output
1
2
4
3
5
8
7
6
SDA
SCL
CTRL0
CTRL1
DS1085
051506

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DS1085Z-50 Summary of contents

Page 1

... DEVICE PACKAGE DS1085Z-10 150mil SO DS1085Z-25 150mil SO DS1085Z-50 150mil SO DESCRIPTION The DS1085 is a dual-output frequency synthesizer requiring no external timing components for operation. It can be used as a standalone oscillator dynamically programmed, processor-controlled peripheral device. An internal master oscillator can be programmed from 66MHz to 133MHz with three resolution options of 10kHz, 25kHz, and 50kHz ...

Page 2

External control inputs, CTRL1 and CTRL0, enable or disable the two oscillator outputs. Both outputs feature a synchronous enable that ensures no output glitches when the output is enabled and a constant time interval (for a given frequency setting) from ...

Page 3

... PART NUMBER DS1085Z-10 DS1085Z-25 DS1085Z-50 For further description of use of the OFFSET register, see the REGISTER FUNCTIONS section. The master clock can be routed directly to the outputs (OUT0 and OUT1) or through separate prescalers (P0 and P1). In the case of OUT1, an additional programmable divider (N) can be used to generate frequencies down to 8 ...

Page 4

Table 2. DEVICE MODE USING OUT0 EN0 SEL0 PDN0 (BIT) (BIT) (BIT *This mode is for applications where OUT0 is not used, ...

Page 5

... 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. LSB MSB DS1085Z-25 Frequency DAC Offset 104.6MHz 600 Second Data Byte DS1085Z-50 Frequency DAC OS 101.8MHz 500 O2 O1 LSB X X Offset OS LSB O0 ...

Page 6

... EN0 0M1 0M0 DS1085Z-50 FREQUENCY RANGE — — — — 38.4 to 89.6 44.8 to 96.0 51.2 to 102.4 57.6 to 108.8 64.0 to 115.2 70.4 to 121.6 76.8 to 128.0 83.2 to 134.4 89.6 to 140.8 96 ...

Page 7

The functions of the individual bits are described in the following paragraphs. DIV1 (Default Setting = 0) This bit allows the output of the prescaler routed directly to the OUT1 pin (DIV1 = 1). In this condition, ...

Page 8

Table 7a. PRESCALER P0 DIVISOR M SETTINGS 0M1 0M0 PRESCALER *Factory Default Setting Table 7b. PRESCALER P1 DIVISOR M SETTINGS 1M1 1M0 PRESCALER P1 DIVISOR “M” ...

Page 9

N The DIV word sets the programmable divider. These 10 bits (N0–N9) determine the value of the programmable divider (N). The range of divisor values is from two to 1025, and is equal to the programmed value of N plus ...

Page 10

COMMAND SET Data and control information is read from and written to the DS1085 in the format shown in Figure 3. To write to the DS1085, the master issues the slave address of the DS1085 and the R/ receiving an ...

Page 11

Access RANGE [37h the next data bytes read are the values stored in the RANGE register. This register has a 14- W bit value. The upper eight bits are sent first, followed by a second byte ...

Page 12

SERIAL DATA BUS The DS1085 communicates through a 2-wire serial interface. A device that sends data onto the bus is defined as a transmitter, and a device receiving data as a receiver. The device that controls the message is ...

Page 13

A master must signal an end of data to the slave by not generating an acknowledge bit on the last byte that has been clocked out of the slave. In this case, the slave must leave the data line HIGH ...

Page 14

SLAVE ADDRESS A control byte is the first byte received following the START condition from the master device. The control byte consists of a 4-bit control code; for the DS1085, this is set as 1011 binary for read and write ...

Page 15

Figure 4. 2-WIRE SERIAL COMMUNICATION WITH DS1085 ...

Page 16

ABSOLUTE MAXIMUM RATINGS* Voltage on Any Pin Relative to Ground Operating Temperature Range Storage Temperature Range Soldering Temperature * This is a stress rating only and functional operation of the device at these or any other conditions above those indicated ...

Page 17

MASTER OSCILLATOR CHARACTERISTICS PARAMETER SYMBOL Master Oscillator Range Default Master Oscillator Frequency Master Oscillator Frequency Tolerance Voltage Frequency Variation Temperature Frequency Variation Integral Nonlinearity of Frequency DAC AC ELECTRICAL CHARACTERISTICS PARAMETER SYMBOL Frequency Stable After DIV Change Frequency Stable After ...

Page 18

AC ELECTRICAL CHARACTERISTICS: 2-WIRE INTERFACE PARAMETER SYMBOL SCL Clock Frequency Bus Free Time Between a STOP and START Condition Hold Time (Repeated) START Condition LOW Period of SCL HIGH Period of SCL Setup Time for a Repeated START Data Hold ...

Page 19

This indicates the time taken between power-up and the outputs becoming active. An on-chip delay is intentionally introduced to allow the oscillator to stabilize. t clock cycles and hence depends on the programmed clock frequency. 10) Output voltage swings ...

Page 20

TYPICAL OPERATING CHARACTERISTICS (V SUPPLY CURRENT vs. TEMPERATURE 33.0 32.5 32.0 31.5 31.0 30.5 30.0 29.5 29.0 28.5 28 TEMPERATURE (°C) SUPPLY CURRENT vs. DIVISOR 200 ...

Page 21

TYPICAL OPERATING CHARACTERISTICS (continued) SUPPLY CURRENT vs. DIVISOR 200 400 600 DIVISOR (N) FREQUENCY % CHANGE vs. SUPPLY VOLTAGE 2.0 1.5 1.0 0.5 0.0 -0.5 DS1085-50 -1.0 DS1085-25 -1.5 DS1085-10 -2.0 4.75 ...

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