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DS1091LU-66+
Automotive Temperature Range Spread-Spectrum EconOscillator™
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
POS Terminals
LCD Displays
Printers
Industrial Control
Features
S Spread-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
S Factory Trimmed
S Center-Dithered (DS1091LUA) or Down-Dithered
(DS1091LUB) Spread-Spectrum Output
S Pin-Selectable Center-Dither Magnitude of 0%,
±1%, ±2%, or ±4%
S Pin-Selectable Down-Dither Magnitude of 0%, -2%,
-4%, or -8%
S Pin-Selectable Dither Rate
S 3.0V to 3.6V Supply Operation
S Lead(Pb)-Free, 8-Pin µMAX Package
Custom Frequency Options
Custom frequency options are available. See the Ordering
Information or contact the factory by email at custom.
[email protected] for more information.
Ordering Information appears at end of data sheet.
EconOscillator is a trademark and µMAX is a registered trademark of Maxim Integrated Products, Inc.
Typical Operating CircuitOUTDR
VCC
VCC
fOUT
DECOUPLING
CAPACITORSSEL0
VCCN.C.
N.C.
SEL1
GND
VCC
DS1091L
DS1091L
Automotive Temperature Range
Spread-Spectrum EconOscillator™
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
ABSOLUTE MAXIMUM RATINGS
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional opera-
tion 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.)
DC ELECTRICAL CHARACTERISTICS
(VCC = +3.0V to +3.6V, TA = -40NC to +125NC, unless otherwise noted.)
*This voltage must not exceed 6.0V.
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Supply VoltageVCC(Note 1)3.03.33.6V
High-Level Input Voltage
(SEL0, SEL1, DR)VIH0.7 x
VCC
VCC +
0.3V
Low-Level Input Voltage
(SEL0, SEL1, DR)VIL-0.30.3 x
VCCV
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
High-Level Output Voltage (OUT)VOHIOH = -4mA, VCC = 3.0V2.4V
Low-Level Output Voltage (OUT)VOLIOL = 4mA0.4V
High-Level Input Current
(SEL0, SEL1, DR)IIHVCC = 3.6V1FA
Low-Level Input Current
(SEL0, SEL1, DR)IILVIL = 0V-1FA
Supply Current (Active)ICC(Note 2)16mA
DS1091L
Automotive Temperature Range
Spread-Spectrum EconOscillator™
Note 1: All voltages are referenced to ground. Currents entering the IC are specified positive and currents exiting the IC are negative.
Note 2: Supply current measured with CL = 15pF, VCC = 3.6V, TA = +25°C, fOUT = 66.6MHz, no dither.
Note 3: No dither.
Note 4: Guaranteed by design.
Note 5: For aging characteristics, contact factory.
AC ELECTRICAL CHARACTERISTICS
(VCC = +3.0V to +3.6V, TA = -40NC to +125NC, unless otherwise noted.)
Typical Operating Characteristics
(VCC = 3.3V, TA = +25°C, unless otherwise noted.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Output Frequency RangefOUT(Note 3)0.13066.6MHz
Output Center Frequency
ToleranceDfOUT
VCC = 3.3V, TA = +25NC-0.250+0.25Across TA and VCC-1.75+1.75
0NC to +70NC, across VCC-1.2+1.2
Power-Up TimetPU(Note 4)0.1ms
Load CapacitanceCL1550pF
Duty Cycle< 33.3MHz (Note 3)50%R 33.3MHz (Note 3)4060
Jitter (RMS), 50MHz0.3%
SUPPLY CURRENT vs. TEMPERATURE
DS1091L toc01
TEMPERATURE (°C)
ICC
(mA)
VCC = 3.6V
VCC = 3.3V
VCC = 3.0V
FREQUENCY VARIATION
vs. TEMPERATURE
DS1091L toc02
TEMPERATURE (°C)
FREQUENCY VARIATION (%)
VCC = 3.3V
NO DITHER
fOUT = 130kHz
fOUT = 66MHz
FREQUENCY VARIATION
vs. VOLTAGE
DS1091L toc03
VCC (V)
FREQUENCY VARIATION (%)
fOUT = 66MHz
fOUT = 130kHz
NO DITHER
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
DS1091L toc04
VCC (V)
DUTY CYCLE (%)
fOUT = 66MHz
fOUT = 130kHz
NO DITHER
DUTY CYCLE vs. TEMPERATURE
DS1091L toc05
TEMPERATURE (°C)
DUTY CYCLE (%)
fOUT = 66MHz
fOUT = 130kHz
NO DITHER
OUTPUT RISE TIME
DS1091L toc06
TIME (ns)
OUTPUT (V)
RISE TIME
= 1.02ns
TYPICAL
AT 12pF LOAD
OUTPUT FALL TIME
DS1091L toc07
TIME (ns)
OUTPUT (V)
FALL TIME
= 1.13ns
TYPICAL
AT 12pF LOAD
SPECTRUM ATTENUATION vs. FREQUENCY
AT DIFFERENT DITHER AMPLITUDES
DS1091L toc08
FREQUENCY (MHz)
ATTENUATION (dB)
±1%
±2%
±4%
8dB11dB14dB
fOUT = 33.3MHzRBW = 120kHz
CENTER DITHER
DS1091L
Automotive Temperature Range
Spread-Spectrum EconOscillator™
Pin ConfigurationPin Description
Block Diagram
PINNAMEFUNCTIONOUTSpread-Spectrum Clock OutputVCCSupply VoltageGNDGroundSEL1Spread-Spectrum Dither Magnitude
Select Inputs. Selects dither
magnitude (see Table 1).5SEL0
6, 7N.C.No ConnectionDRSpread-Spectrum Dither Rate Selector.
Selects dither rate (see Table 2).
N.C.
N.C.
SEL0SEL1
GND
VCC
OUT
µMAXTOP VIEW
DS1091L
FACTORY-PROGRAMMED
MASTER OSCILLATOR
DITHER RATE DIVIDERTRIANGLE-WAVE GENERATOR
(DITHER %)
FACTORY-PROGRAMMED
PRESCALER
SEL0SEL1DR
OUT
fOUT
VCC
VCC
GND
fMOSC IS THE MASTER OSCILLATOR FREQUENCY.
fMOSC
fDITHERfMOSC
DS1091L
DS1091L
Automotive Temperature Range
Spread-Spectrum EconOscillator™
Detailed Description
The DS1091L clock generator is capable of output fre-
quencies from 130kHz to 66.6MHz over the full automo-
tive temperature range (-40°C to +125°C). The device
can also produce a spread-spectrum (dithered) square-
wave output using four pin-selectable dither percent-
ages. 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 pro-
grammed 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 set-
ting of the DR pin (see the equation below). Figure 1A and
Figure 1B show a plot of the output frequency vs. time.
OUTDITHERRATE=
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 ini-
tial power-up.
DS1091L Frequency Spreading Profile as a Function of Dither %
Table 1. Dither Magnitude
Table 2. Value of n w.r.t. Output Frequency
SEL1
LOGIC
LEVEL
SEL0
LOGIC
LEVEL
DITHER MAGNITUDE (%)
DS1091LUADS1091LUB0No ditherNo dither1Q1-20Q2-41Q4-8
OUTPUT FREQUENCY fOUT
(MHz)n
fOUT (min)fOUT (max)DR = LOGIC
LEVEL 1
DR = LOGIC
LEVEL 0
TIME
DITHER FREQ
PROGRAMMED fOUT+
(1%, 2%, OR 4% OF fOUT)
PROGRAMMED fOUT-
(1%, 2%, OR 4% OF fOUT)
PROGRAMMED fOUT
DITHER
AMOUNT
(±1%, ±2%,
OR ±4%)
IF DITHER AMOUNT = 0%
fOUT
TIME
DITHER FREQ
PROGRAMMED fOUT
PROGRAMMED fOUT-
(2%, 4%, OR 8% OF fOUT)
DITHER
AMOUNT
(-2%, -4%,
OR -8%)
IF DITHER AMOUNT = 0%
fOUT
