MAXIM DS1091L_11

19-5768; Rev 2; 9/11
DS1091L
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).
Applications
Automotive Infotainment
Features
SSpread-Spectrum Clock Output from 130kHz to
66.6MHz
S-40°C to +125°C Operating Temperature Range
S±1.75% Accuracy Across Temperature and Voltage
SFactory Trimmed
SCenter-Dithered (DS1091LUA) or Down-Dithered
(DS1091LUB) Spread-Spectrum Output
SPin-Selectable Center-Dither Magnitude of 0%,
±1%, ±2%, or ±4%
POS Terminals
SPin-Selectable Down-Dither Magnitude of 0%, -2%,
-4%, or -8%
LCD Displays
SPin-Selectable Dither Rate
Printers
S3.0V to 3.6V Supply Operation
Industrial Control
SLead(Pb)-Free, 8-Pin µMAX Package
Typical Operating Circuit
VCC
fOUT
VCC
OUT
VCC
DECOUPLING
CAPACITORS
GND
SEL1
8
1
2
DS1091L
7
3
6
4
5
Custom Frequency Options
Custom frequency options are available. See the
Ordering Information or contact the factory by email at
[email protected] for more information.
DR
N.C.
N.C.
VCC
Ordering Information appears at end of data sheet.
SEL0
EconOscillator is a trademark and µMAX is a registered trademark of Maxim Integrated Products, Inc.
For related parts and recommended products to use with this part, refer to: www.maxim-ic.com/DS1091L.related
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For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
DS1091L
Automotive Temperature Range
Spread-Spectrum EconOscillator™
ABSOLUTE MAXIMUM RATINGS
Voltage Range on VCC Relative to Ground..........-0.5V to +6.0V
Voltage Range on DR, SEL0, SEL1
Relativeto Ground................................. -0.5V to (VCC + 0.5V)*
Continuous Power Dissipation (TA = +70°C)
µMAX (derate 4.5mW/°C above +70°C)......................362mW
Operating Temperature Range......................... -40°C to +125°C
Storage Temperature Range............................. -55°C to +125°C
Lead Temperature (soldering, 10s).................................+300°C
Soldering Temperature (reflow).......................................+260°C
*This voltage must not exceed 6.0V.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
RECOMMENDED OPERATING CONDITIONS
(TA = -40NC to +125NC, unless otherwise noted.)
PARAMETER
SYMBOL
Supply Voltage
VCC
High-Level Input Voltage
(SEL0, SEL1, DR)
VIH
Low-Level Input Voltage
(SEL0, SEL1, DR)
VIL
CONDITIONS
(Note 1)
MIN
TYP
MAX
UNITS
3.0
3.3
3.6
V
0.7 x
VCC
VCC +
0.3
V
-0.3
0.3 x
VCC
V
MAX
UNITS
DC ELECTRICAL CHARACTERISTICS
(VCC = +3.0V to +3.6V, TA = -40NC to +125NC, unless otherwise noted.)
PARAMETER
SYMBOL
High-Level Output Voltage (OUT)
VOH
IOH = -4mA, VCC = 3.0V
CONDITIONS
MIN
TYP
Low-Level Output Voltage (OUT)
VOL
IOL = 4mA
0.4
V
High-Level Input Current
(SEL0, SEL1, DR)
IIH
VCC = 3.6V
1
FA
Low-Level Input Current
(SEL0, SEL1, DR)
IIL
VIL = 0V
Supply Current (Active)
ICC
(Note 2)
2.4
V
-1
FA
16
mA
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DS1091L
Automotive Temperature Range
Spread-Spectrum EconOscillator™
AC ELECTRICAL CHARACTERISTICS
(VCC = +3.0V to +3.6V, TA = -40NC to +125NC, unless otherwise noted.)
PARAMETER
SYMBOL
Output Frequency Range
fOUT
Output Center Frequency
Tolerance
DfOUT
Power-Up Time
tPU
Load Capacitance
CL
CONDITIONS
MIN
TYP
UNITS
66.6
MHz
0.130
VCC = 3.3V, TA = +25NC
-0.25
Across TA and VCC
0NC to +70NC, across VCC
-1.75
+1.75
-1.2
+1.2
0
+0.25
(Note 4)
< 33.3MHz (Note 3)
%
0.1
ms
50
pF
15
Duty Cycle
50
40
R 33.3MHz (Note 3)
%
60
Jitter (RMS), 50MHz
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
MAX
(Note 3)
0.3
%
All voltages are referenced to ground. Currents entering the IC are specified positive and currents exiting the IC are negative.
Supply current measured with CL = 15pF, VCC = 3.6V, TA = +25°C, fOUT = 66.6MHz, no dither.
No dither.
Guaranteed by design.
For aging characteristics, contact factory.
Typical Operating Characteristics
(VCC = 3.3V, TA = +25°C, unless otherwise noted.)
VCC = 3.3V
8.2
8.0
VCC = 3.0V
7.8
0.75
0.25
fOUT = 130kHz
-0.25
fOUT = 66MHz
-0.75
-1.25
7.6
7.4
-40
-10
20
50
TEMPERATURE (°C)
80
110
DS1091L toc03
0.25
0.20
FREQUENCY VARIATION (%)
ICC (mA)
8.6
8.4
1.25
FREQUENCY VARIATION (%)
8.8
VCC = 3.3V
NO DITHER
DS1091L toc02
VCC = 3.6V
9.0
1.75
DS1091L toc01
9.2
FREQUENCY VARIATION
vs. VOLTAGE
FREQUENCY VARIATION
vs. TEMPERATURE
SUPPLY CURRENT vs. TEMPERATURE
0.15
0.10
0.05
fOUT = 66MHz
0.00
-0.05
fOUT = 130kHz
-0.10
-0.15
NO DITHER
-0.20
-0.25
-1.75
-40
-10
20
50
80
TEMPERATURE (°C)
110
3.0
3.1
3.2
3.3
3.4
3.5
3.6
VCC (V)
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DS1091L
Automotive Temperature Range
Spread-Spectrum EconOscillator™
Typical Operating Characteristics (continued)
(VCC = 3.3V, TA = +25°C, unless otherwise noted.)
DUTY CYCLE vs. SUPPLY VOLTAGE
50
fOUT = 130kHz
48
46
49.0
NO DITHER
42
48.0
3.2
3.3
3.4
3.5
3.6
40
0.0
-40
-15
10
VCC (V)
35
60
85
110
TIME (ns)
TEMPERATURE (°C)
SPECTRUM ATTENUATION vs. FREQUENCY
AT DIFFERENT DITHER AMPLITUDES
OUTPUT FALL TIME
3.5
5
3.0
FALL TIME
= 1.13ns
TYPICAL
AT 12pF LOAD
2.5
2.0
1.5
1.0
0
RBW = 120kHz
0%
CENTER DITHER
-10
fOUT = 33.3MHz
±1%
-5
ATTENUATION (dB)
3.1
1.5
0.5
NO DITHER
DS1091L toc07
3.0
2.0
1.0
44
48.5
RISE TIME
= 1.02ns
TYPICAL
AT 12pF LOAD
2.5
fOUT = 66MHz
52
3.0
8dB
±2%
11dB
DS1091L toc08
49.5
54
DS1091L toc06
56
OUTPUT (V)
fOUT = 130kHz
50.0
OUTPUT (V)
DUTY CYCLE (%)
50.5
58
DUTY CYCLE (%)
fOUT = 66MHz
OUTPUT RISE TIME
3.5
DS1091L toc05
51.5
51.0
DUTY CYCLE vs. TEMPERATURE
60
DS1091L toc04
52.0
14dB
±4%
-15
-20
-25
0.5
-30
0.0
-35
31.9
TIME (ns)
32.4
32.9
33.4
33.9
34.4
34.9
FREQUENCY (MHz)
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DS1091L
Automotive Temperature Range
Spread-Spectrum EconOscillator™
Pin Configuration
Pin Description
PIN
NAME
1
OUT
Spread-Spectrum Clock Output
2
VCC
Supply Voltage
DR
3
GND
Ground
4
SEL1
5
SEL0
Spread-Spectrum Dither Magnitude
Select Inputs. Selects dither
magnitude (see Table 1).
6, 7
N.C.
No Connection
8
DR
TOP VIEW
OUT
1
+
8
VCC
2
7
N.C.
GND
3
6
N.C.
SEL1
4
5
SEL0
DS1091L
µMAX
FUNCTION
Spread-Spectrum Dither Rate Selector.
Selects dither rate (see Table 2).
Block Diagram
VCC
fMOSC
GND
fMOSC
FACTORY-PROGRAMMED
MASTER OSCILLATOR
DITHER RATE DIVIDER
DR
fDITHER
TRIANGLE-WAVE GENERATOR
(DITHER %)
SEL1
FACTORY-PROGRAMMED
PRESCALER
VCC
DS1091L
fOUT
OUT
SEL0
fMOSC IS THE MASTER OSCILLATOR FREQUENCY.
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DS1091L
Automotive Temperature Range
Spread-Spectrum EconOscillator™
Detailed Description
The DS1091L clock generator is capable of output frequencies from 130kHz to 66.6MHz over the full automotive temperature range (-40°C to +125°C). The device
can also produce a spread-spectrum (dithered) squarewave output using four pin-selectable dither percentages. Both center (DS1091LUA) and down (DS1091LUB)
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 can reduce radiated emission 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 DS1091LUB 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 1A and
Figure 1B show a plot of the output frequency vs. time.
f
DITHER RATE = OUT
2n
where n is defined in Table 2 as a function of output
frequency. For example, for an output frequency of
27.0MHz, the dither rate would be 13.2kHz for DR = 1
and 6.6kHz for DR = 0.
Power-Up
Upon the application of power, the DS1091L output is
held in the low state until tPU has elapsed. This removes
any possibility of erroneous output transitions during initial power-up.
Table 1. Dither Magnitude
SEL1
LOGIC
LEVEL
SEL0
LOGIC
LEVEL
DS1091LUA
DS1091LUB
0
0
No dither
No dither
0
1
Q1
-2
1
0
Q2
-4
1
1
Q4
-8
DITHER MAGNITUDE (%)
Table 2. Value of n w.r.t. Output Frequency
OUTPUT FREQUENCY fOUT
(MHz)
n
fOUT (min)
fOUT (max)
DR = LOGIC
LEVEL 1
DR = LOGIC
LEVEL 0
0.130
0.260
4
5
0.261
0.521
5
6
0.522
1.042
6
7
1.043
2.083
7
8
2.084
4.167
8
9
4.168
8.333
9
10
8.334
16.667
10
11
16.668
33.333
11
12
33.334
66.667
12
13
DS1091L Frequency Spreading Profile as a Function of Dither %
IF DITHER AMOUNT = 0%
IF DITHER AMOUNT = 0%
DITHER
AMOUNT
(±1%, ±2%,
OR ±4%)
1
DITHER FREQ
PROGRAMMED fOUT
DITHER
AMOUNT
(-2%, -4%,
OR -8%)
PROGRAMMED fOUT(2%, 4%, OR 8% OF fOUT)
fOUT
fOUT
PROGRAMMED fOUT+
(1%, 2%, OR 4% OF fOUT)
PROGRAMMED fOUT
PROGRAMMED fOUT(1%, 2%, OR 4% OF fOUT)
1
DITHER FREQ
TIME
Figure 1A. Center Dithered
TIME
Figure 1B. Down Dithered
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DS1091L
Automotive Temperature Range
Spread-Spectrum EconOscillator™
Chip Information
Applications Information
Power-Supply Decoupling
To achieve best results, it is highly recommended that
decoupling capacitors are used on the IC power-supply
pins. Typical values of decoupling capacitors are 0.01µF
and 0.1µF. Use a high-quality, ceramic, surface-mount
capacitor, and mount it as close as possible to the VCC
and GND pins of the IC to minimize lead inductance.
SUBSTRATE CONNECTED TO GROUND
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maxim-ic.com/packages. Note that a
“+”, “#”, or “-” in the package code indicates RoHS status only.
Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
8 µMAX
U8+1
21-0036
90-0092
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DS1091L
Automotive Temperature Range
Spread-Spectrum EconOscillator™
Ordering Information
PART
TEMP RANGE
SPREAD SPECTRUM
OUTPUT FREQUENCY (MHz)
PIN-PACKAGE
DS1091LUA-027+
-40NC to +125NC
Center
27.0
8 FMAX
DS1091LUA-027+T
-40NC to +125NC
Center
27.0
8 FMAX
DS1091LUA-033/V+
-40NC to +125NC
Center
33.3
8 FMAX
DS1091LUA-033V+T
-40NC to +125NC
Center
33.3
8 FMAX
DS1091LUA-033+
-40NC to +125NC
Center
33.3
8 FMAX
DS1091LUA-033+T
-40NC to +125NC
Center
33.3
8 FMAX
DS1091LUA-040/V+
-40NC to +125NC
Center
40.0
8 FMAX
DS1091LUA-040/V+T
-40NC to +125NC
Center
40.0
8 FMAX
DS1091LUA-040+
-40NC to +125NC
Center
40.0
8 FMAX
DS1091LUA-040+T
-40NC to +125NC
Center
40.0
8 FMAX
DS1091LUA-066/V+
-40NC to +125NC
Center
66.6
8 FMAX
DS1091LUA-066/V+T
-40NC to +125NC
Center
66.6
8 FMAX
DS1091LUA-066+
-40NC to +125NC
Center
66.6
8 FMAX
DS1091LUA-066+T
-40NC to +125NC
Center
66.6
8 FMAX
DS1091LUA-10A/V+
-40NC to +125NC
Center
10.38
8 FMAX
DS1091LUA-10A/V+T
-40NC to +125NC
Center
10.38
8 FMAX
DS1091LUA-200/V+
-40NC to +125NC
Center
0.20
8 FMAX
DS1091LUA-200/V+T
-40NC to +125NC
Center
0.20
8 FMAX
DS1091LUA-200+
-40NC to +125NC
Center
0.20
8 FMAX
DS1091LUA-200+T
-40NC to +125NC
Center
0.20
8 FMAX
DS1091LUA-330/V+
-40NC to +125NC
Center
33.0
8 FMAX
DS1091LUA-330/V+T
-40NC to +125NC
Center
33.0
8 FMAX
DS1091LUA-330+
-40NC to +125NC
Center
33.0
8 FMAX
DS1091LUA-330+T
-40NC to +125NC
Center
33.0
8 FMAX
DS1091LUA-xxx+
-40NC to +125NC
Center
Custom (contact factory)
8 FMAX
DS1091LUB-008+T
-40NC to +125NC
Down
8.0
8 FMAX
DS1091LUB-027+
-40NC to +125NC
Down
27.0
8 FMAX
DS1091LUB-027+T
-40NC to +125NC
Down
27.0
8 FMAX
DS1091LUB-033+
-40NC to +125NC
Down
33.3
8 FMAX
DS1091LUB-033+T
-40NC to +125NC
Down
33.3
8 FMAX
DS1091LUB-066+
-40NC to +125NC
Down
66.6
8 FMAX
DS1091LUB-066+T
-40NC to +125NC
Down
66.6
8 FMAX
DS1091LUB-xxx+
-40NC to +125NC
Down
Custom (contact factory)
8 FMAX
V denotes an automotive qualified part.
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
xxx Denotes factory-programmed custom frequencies. Email [email protected] for more information.
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DS1091L
Automotive Temperature Range
Spread-Spectrum EconOscillator™
Revision History
REVISION
NUMBER
REVISION
DATE
0
9/06
Initial release
1
3/11
Added the continuous power dissipation numbers, lead temperature, and soldering temperature to the Absolute Maximum Ratings section; updated the custom frequency technical support information; updated the Ordering Information table; added the land pattern
no. to the Package Information table
2
9/11
Updated the Ordering Information table
DESCRIPTION
PAGES
CHANGED
—
1, 2, 7
7
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. The parametric values (min and max limits) shown in the Electrical
Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2011
Maxim Integrated Products 9
Maxim is a registered trademark of Maxim Integrated Products, Inc.