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PDF DS1091L Data sheet ( Hoja de datos )
| Número de pieza | DS1091L | |
| Descripción | Automotive Temperature Range Spread Spectrum Econoscillator | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Rev 0; 9/06
Automotive Temperature Range
Spread-Spectrum Econoscillator
General Description
The DS1091L is a low-cost clock generator that is factory-
trimmed to output frequencies from 130kHz to 66.6MHz
with a nominal accuracy of ±0.25%. The device can also
produce a center- or down-dithered spread-spectrum
output with pin-selectable dither magnitude and rate.
Assembled in an 8-pin µMAX package, the DS1091L is
designed to operate with a 3.0V to 3.6V power supply
over the automotive temperature range (-40°C to
+125°C).
Automotive Infotainment
POS Terminals
LCD Displays
Printers
Industrial Control
Applications
Features
♦ Spread-Spectrum Clock Output from 130kHz to
66.6MHz
♦ Operating Temperature Range of -40°C to +125°C
♦ Accuracy of ±1.75% Across Temperature and
Voltage
♦ Factory Trimmed
♦ Center-Dithered (DS1091LA) or Down-Dithered
(DS1091LB) Spread-Spectrum Output
♦ Pin-Selectable Center-Dither Magnitude of 0%,
±1%, ±2%, or ±4%
♦ Pin-Selectable Down-Dither Magnitude of 0%, -2%,
-4%, or -8%
♦ Pin-Selectable Dither Rate
♦ 3.0V to 3.6V Supply Operation
♦ Lead-Free 8-Pin µMAX Package
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE SPREAD SPECTRUM OUTPUT FREQUENCY (MHz)
DS1091LUA+027
-40°C to +125°C
8 µMAX
Center
27.0
DS1091LUA+033
-40°C to +125°C
8 µMAX
Center
33.3
DS1091LUA+066
-40°C to +125°C
8 µMAX
Center
66.6
DS1091LUA+xxx
-40°C to +125°C
8 µMAX
Center
Custom (Contact Factory)
DS1091LUB+027
-40°C to +125°C
8 µMAX
Down
27.0
DS1091LUB+033
-40°C to +125°C
8 µMAX
Down
33.3
DS1091LUB+066
-40°C to +125°C
8 µMAX
Down
66.6
DS1091LUB+xxx
-40°C to +125°C
8 µMAX
Down
Custom (Contact Factory)
+Denotes lead-free package.
xxx Denotes factory-programmed custom frequencies.
Email [email protected] for information/questions concerning custom frequencies.
Typical Operating Circuit
Pin Configuration
fOUT
VCC
DECOUPLING
CAPACITORS
OUT 1
VCC 2
GND
3
SEL1 4
DS1091L
VCC
DR
8
N.C.
7
6 N.C. VCC
5 SEL0
TOP VIEW
OUT 1
VCC 2
GND 3
SEL1 4
DS1091L
µμMAX
8 DR
7 N.C.
6 N.C.
5 SEL0
88 µμMAXX
______________________________________________ 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.
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Automotive Temperature Range
Spread-Spectrum Econoscillator
Block Diagram
DS1091L
VCC
VCC
FACTORY-PROGRAMMED
MASTER OSCILLATOR
fMOSC
fMOSC
fDITHER
GND
DITHER RATE DIVIDER
TRIANGLE WAVE GENERATOR
(DITHER %)
fOUT
OUT
DR
WHERE fMOSC IS THE MASTER OSCILLATOR FREQUENCY.
SEL1 SEL0
Detailed Description
The DS1091L is a clock generator that is capable of
output frequencies from 130kHz to 66.6MHz over the
full automotive temperature range (-40°C to +125°C).
The device also is capable of producing a spread-
spectrum (dithered) square-wave output using four pin-
selectable dither percentages. Both center (DS1091LA)
and down (DS1091LB) dithering options are available.
The device also features two selectable dither rates.
The DS1091L is shipped from the factory programmed
to a customer-specified frequency.
Spread Spectrum
The DS1091L has the ability to reduce radiated emis-
sion peaks. The dither percentage is controlled by the
state of the SEL0 and SEL1 pins. The output frequency
can be dithered at 0%, ±1%, ±2%, and ±4%, centered
around the programmed frequency (for the DS1091LB
this can be down dithered by 0%, -2%, -4%, and -8%).
The two select pins SEL0 and SEL1 provide a means of
selecting the dither magnitudes as follows:
A triangle wave generator injects a control signal into
the master oscillator to dither its output. The dither rate
is a function of the output frequency, fOUT as well as the
setting of the DR pin (see the equation below). Figure 1
shows a plot of the output frequency versus time.
DITHER RATE
=
fOUT
2n
where n is defined in Table 2 as a function of output fre-
quency. For example, for an output frequency of
27.0MHz, the dither rate would be 13.2kHz for DR = 0
and 6.6kHz for DR = 1.
Table 1.
SEL1
SEL0
LOGIC LEVEL LOGIC LEVEL
00
01
10
11
DITHER MAGNITUDE
DS1091LA DS1091LB
No Dither
No Dither
±1%
-2%
±2%
-4%
±4%
-8%
Table 2.
OUTPUT FREQUENCY fOUT
(MHz)
fOUT (min)
0.130
0.261
0.522
1.043
2.084
4.168
8.334
16.668
33.334
fOUT (max)
0.260
0.521
1.042
2.083
4.167
8.333
16.667
33.333
66.667
n
DR = LOGIC
LEVEL 1
4
5
6
7
8
9
10
11
12
DR = LOGIC
LEVEL 0
5
6
7
8
9
10
11
12
13
_____________________________________________________________________ 5
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