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PDF DS1094L Data sheet ( Hoja de datos )
| Número de pieza | DS1094L | |
| Descripción | Multiphase Spread-Spectrum EconOscillator | |
| Fabricantes | Dallas Semiconducotr | |
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Rev 1; 5/04
Multiphase Spread-Spectrum EconOscillator
General Description
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 I2C™-compati-
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.
Applications
Switch-Mode Power Supplies
Servers
Printers
Automotive Telematics and Infotainment
Features
♦ EconOscillator™ with Two, Three, or Four Phase
Outputs
♦ Ideally Suited as the Clock Generator for Switch-
Mode Power Supplies
♦ Output Frequencies Programmable from 2MHz to
31.25kHz
♦ Dithered Output Significantly Reduces EMI
Emissions
♦ No External Timing Components Required
♦ Nonvolatile (NV) Configuration Settings
♦ User-Programmable—Factory Programmed
Options Available
♦ Operating Temperature Range: -40°C to +85°C
PART
DS1094LU
Ordering Information
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
8 µSOP
Typical Operating Circuit
Pin Configuration
VCC
RPULLUP
VCC OUT1
OUT2
OUT3
SCL OUT4
SDA
GND
DS1094L
THREE-PHASE
EXAMPLE WITH
DITHERED CLOCKS TO
REDUCE EMI
VIN
PHASE 1
PHASE 2
PHASE 3
DC-DC
STEP-DOWN
CONVERTER
DC-DC
STEP-DOWN
CONVERTER
DC-DC
STEP-DOWN
CONVERTER
VOUT
EconOscillator is a trademark of Dallas Semiconductor.
TOP VIEW
OUT1 1
OUT2 2
VCC 3
GND 4
DS1094L
8 SCL
7 SDA
6 OUT4
5 OUT3
µSOP
I2C is a trademark of Philips Corp. Purchase of I2C compo-
nents of Maxim Integrated Products, Inc., or one of its subli-
censed Associated Companies, conveys a license under the
Philips I2C Patent Rights to use these components in an I2C
system, provided that the system conforms to the I2C Standard
Specification as defined by Philips.
______________________________________________ Maxim Integrated Products 1
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.
1 page  
Multiphase Spread-Spectrum EconOscillator
Typical Operating Characteristics (continued)
(VCC = +3.3V, TA = +25°C, unless otherwise noted.)
DUTY CYCLE vs. FREQUENCY
VCC = 3.3V, +25°C
55
2φ
50
4φ
45
40
3φ
35
OUTPUT FREQUENCY TOLERANCE
VCC = 3.3V, +25°C
0.5
0
-0.5
-1.0
VOLTAGE FREQUENCY VARIATION
0.50
0.25 fOUT = 1MHz
0
fOUT = 2MHz
-0.25
fOUT = 125kHz
30
1.00
1.25 1.50 1.75
fOUT (MHz)
2.00
-1.5 -0.50
1.00 1.25 1.50 1.75 2.00
3.0
fOUT (MHz)
3.2 3.0 3.5
SUPPLY VOLTAGE (V)
3.6
TEMPERATURE FREQUENCY VARIATON
0.4
0
fOUT = 2MHz
-.04
fOUT = 1MHz
-0.8
fOUT = 125kHz
-1.2
-1.6
-2.0
-40
-15 10 35 60
TEMPERATURE (°C)
85
Pin Description
PIN NAME
FUNCTION
1 OUT1 Oscillator Output 1
2 OUT2 Oscillator Output 2
3 VCC Positive Supply Terminal
4 GND Ground
5 OUT3 Oscillator Output 3
6 OUT4 Oscillator Output 4
7 SDA 2-Wire Serial-Interface Data
Input/Output
8 SCL 2-Wire Serial-Interface Clock Input
PEAK-TO-PEAK JITTER vs. fMOSC
2.5
2.0
1.5
1.0
0.8
1.0 1.2 1.4 1.6 1.8 2.0
fMOSC (MHz)
_____________________________________________________________________ 5
5 Page 
Multiphase Spread-Spectrum EconOscillator
TYPICAL 2-WIRE WRITE TRANSACTION
MSB
LSB
MSB
LSB MSB
LSB
START
10
1
1
A2* A1* A0* R/W
SLAVE
ACK
b7 b6 b5 b4 b3 b2 b1 b0
SLAVE
ACK
b7
b6
b5
b4
b3
b2
b1
b0
SLAVE
ACK
STOP
SLAVE ADDRESS
READ/
WRITE
COMMAND/REGISTER ADDRESS
* THE ADDRESS DETERMINED BY A0, A1, AND A2 MUST MATCH THE ADDRESS SET IN THE ADDR REGISTER.
DATA
EXAMPLE 2-WIRE TRANSACTIONS (WHEN A0, A1, AND A2 ARE ZERO)
A) SINGLE BYTE WRITE
-WRITE DAC REGISTER TO 0Ah
B0h 08h 0Ah
START 1 0 1 1 0 0 0 0
SLAVE
ACK
00
0
01
00
0
SLAVE
ACK
0 00 0 1
010
SLAVE
ACK
STOP
B) SINGLE BYTE READ
-READ DAC REGISTER
B0h 08h
B1h DATA
START 1 0 1 1 0 0 0 0
SLAVE
ACK
00
0
01
00
0
SLAVE
ACK
REPEATED
START
10110 001
SLAVE
ACK
DAC VALUE
MASTER
NACK
STOP
C) SINGLE BYTE WRITE
-WRITE PRESCALER
REGISTER TO CDh
D) WRITE EE COMMAND
- NEEDED ONLY IF WC = 1
B0h 02h CDh
START 1 0 1 1 0 0 0 0
SLAVE
ACK
00
0
00
01
0
SLAVE
ACK
1 10 0 1
101
SLAVE
ACK
STOP
B0h 3Fh
START 1 0 1 1 0 0 0 0
SLAVE
ACK
00
1
11
11
1
SLAVE
ACK
STOP
Figure 5. 2-Wire Communication Examples
Chip Topology
TRANSISTOR COUNT: 7987
SUBSTRATE CONNECTED TO: GROUND
Package Information
For the latest package outline information, go to
www.maxim-ic.com/DallasPackInfo.
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
Printed USA
is a registered trademark of Maxim Integrated Products.
DALLAS is a registered trademark of Dallas Semiconductor Corporation.
11 Page | ||
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