DS1094LU-42M+ Maxim Integrated Products, DS1094LU-42M+ Datasheet

IC ECONOSCILLATOR SS 8-USOP

DS1094LU-42M+

Manufacturer Part Number
DS1094LU-42M+
Description
IC ECONOSCILLATOR SS 8-USOP
Manufacturer
Maxim Integrated Products
Series
EconOscillator™r
Type
Clock Generatorr
Datasheet

Specifications of DS1094LU-42M+

Pll
No
Input
Clock
Output
Clock
Number Of Circuits
1
Ratio - Input:output
2:4
Differential - Input:output
No/No
Frequency - Max
2MHz
Divider/multiplier
Yes/No
Voltage - Supply
3 V ~ 3.6 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
Frequency-max
2MHz
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The DS1094L is a silicon oscillator that generates four
multiphase, spread-spectrum, square-wave outputs.
Frequencies between 2MHz and 31.25kHz can be out-
put in either two, three, or four-phase mode. The inter-
nal master oscillator can be dithered by either 0, 2, 4,
or 8% to reduce the amount of peak spectral energy at
the fundamental and harmonic clock frequencies. This
significantly reduces the amount of electromagnetic
interference (EMI) radiation that is generated at the sys-
tem level. The DS1094L is ideally suited as a clock gen-
erator for switched-mode power supplies. The outputs
generated by the DS1094L are used by DC-DC circuit-
ry to efficiently shift voltages either up or down. The
DS1094L can be programmed using the I
ble, 2-wire serial interface to select the output frequen-
cy, number of clock phases, and dither rate, or
optionally it can be shipped from the factory custom
programmed.
Rev 1; 5/04
EconOscillator is a trademark of Dallas Semiconductor.
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
R
PULLUP
DITHERED CLOCKS TO
DS1094L
Switch-Mode Power Supplies
Servers
Printers
Automotive Telematics and Infotainment
Multiphase Spread-Spectrum EconOscillator
EXAMPLE WITH
THREE-PHASE
REDUCE EMI
SCL
SDA
GND
V
V
CC
CC
OUT1
OUT2
OUT3
OUT4
Typical Operating Circuit
V
PHASE 1
PHASE 2
PHASE 3
IN
General Description
STEP-DOWN
CONVERTER
STEP-DOWN
CONVERTER
STEP-DOWN
CONVERTER
DC-DC
DC-DC
DC-DC
Applications
______________________________________________ Maxim Integrated Products
2
C-compati-
V
OUT
♦ EconOscillator™ with Two, Three, or Four Phase
♦ Ideally Suited as the Clock Generator for Switch-
♦ Output Frequencies Programmable from 2MHz to
♦ Dithered Output Significantly Reduces EMI
♦ No External Timing Components Required
♦ Nonvolatile (NV) Configuration Settings
♦ User-Programmable—Factory Programmed
♦ Operating Temperature Range: -40°C to +85°C
I-
n-
ce
PC
sd
S.
Outputs
Mode Power Supplies
31.25kHz
Emissions
Options Available
DS1094LU
TOP VIEW
PART
OUT1
OUT2
GND
V
CC
1
2
4
3
-40°C to +85°C
Ordering Information
TEMP RANGE
DS1094L
µSOP
Pin Configuration
6
8
7
5
SCL
SDA
OUT4
OUT3
Features
PIN-PACKAGE
8 µSOP
1

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DS1094LU-42M+ Summary of contents

Page 1

... Dithered Output Significantly Reduces EMI Emissions ♦ No External Timing Components Required ♦ Nonvolatile (NV) Configuration Settings 2 C-compati- ♦ User-Programmable—Factory Programmed Options Available ♦ Operating Temperature Range: -40°C to +85°C Applications PART DS1094LU TOP VIEW V OUT ______________________________________________ Maxim Integrated Products Features ...

Page 2

Multiphase Spread-Spectrum EconOscillator ABSOLUTE MAXIMUM RATINGS Voltage Range SDA, and SCL CC Relative to Ground.............................................-0.5V to +6.0V Operating Temperature Range ...........................-40°C to +85°C EEPROM Programming Temperature Range .........0°C to +70°C Stresses beyond those listed under “Absolute Maximum ...

Page 3

Multiphase Spread-Spectrum EconOscillator AC ELECTRICAL CHARACTERISTICS (V = +3.0V to 3.6V -40°C to +85°C, unless otherwise noted PARAMETER SYMBOL Master Oscillator Frequency Output Frequency Tolerance Voltage Frequency Variation Temperature Frequency Variation DAC Step Size Peak-to-Peak Jitter ...

Page 4

Multiphase Spread-Spectrum EconOscillator NONVOLATILE MEMORY CHARACTERISTICS ( +3.0V to 3.6V, unless otherwise noted.) PARAMETER SYMBOL EEPROM Writes Note 1: All voltages referenced to ground. Note 2: This is the change observed in output frequency due to changes in ...

Page 5

Multiphase Spread-Spectrum EconOscillator (V = +3.3V +25°C, unless otherwise noted DUTY CYCLE vs. FREQUENCY V = 3.3V, +25° 2φ 50 4φ 3φ 1.00 1.25 1.50 1.75 2.00 f (MHz) OUT ...

Page 6

Multiphase Spread-Spectrum EconOscillator CONTROL REGISTERS SDA 2-WIRE SERIAL 2-WIRE ADDRESS BITS INTERFACE SCL WRITE EE COMMAND ADDR EEPROM WRITE CONTROL EEPROM DAC PH1 GND PRESCALER Detailed Description The ...

Page 7

Multiphase Spread-Spectrum EconOscillator Table 3. Phase Generator Settings BITS Ph1, Ph0 Table 4. Dither Amount Settings BITS J1, J0 DITHER AMOUNT *The frequency is dithered down from the programmed value of f ...

Page 8

Multiphase Spread-Spectrum EconOscillator will dither between 2MHz and 1.96MHz at a modulation frequency determined by the selected dither frequen- cy. Continuing with the same example and D0 both equal zero, selecting f /128, then the dither MOSC frequency ...

Page 9

Multiphase Spread-Spectrum EconOscillator 2-Wire Serial Interface The following terminology is commonly used to describe 2-wire data transfers. Master Device: The master device controls the slave devices on the bus. The master device generates SCL clock pulses, start, and stop conditions. ...

Page 10

Multiphase Spread-Spectrum EconOscillator MSB A2* A1* 7-BIT SLAVE ADDRESS *THESE BITS MUST MATCH THE CORRESPONDING BITS IN THE ADDR REGISTER. Figure 4. Slave Address Byte that are transferred (most significant bit first) from the slave to ...

Page 11

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11 © 2004 Maxim Integrated Products DALLAS is a registered trademark of Dallas Semiconductor Corporation ...

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