DS1091LUB+033 [MAXIM]
Automotive Temperature Range Spread-Spectrum Econoscillator; 汽车级温度范围扩频EconOscillator
| 型号： | DS1091LUB+033 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Automotive Temperature Range Spread-Spectrum Econoscillator |
| 文件： | 总6页 (文件大小：122K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Reꢁ 0; 9/06
Automotive Temperature Range
Spread-Spectrum Econoscillator
DS091L
General Description
Features
♦ Spread-Spectrum Clock Output from 130kHz to
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 deꢁice 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
oꢁer the automotiꢁe temperature range (-40°C to
+1ꢀ2°C).
66.6MHz
♦ Operating Temperature Range of -40°C to +125°C
♦ Accuracy of 1.ꢀ5ꢁ Acroꢂꢂ Temperature and
Voltage
♦ Factory Trimmed
♦ Center-Dithered (DS1091LA) or Down-Dithered
(DS1091LB) Spread-Spectrum Output
♦ Pin-Selectable Center-Dither Magnitude of 0ꢁ,
Applications
1ꢁ, 2ꢁ, or 4ꢁ
Automotiꢁe Infotainment
♦ Pin-Selectable Down-Dither Magnitude of 0ꢁ, -2ꢁ,
POS Terminals
LCD Displays
Printers
-4ꢁ, or -8ꢁ
♦ Pin-Selectable Dither Rate
♦ 3.0V to 3.6V Supply Operation
♦ Lead-Free 8-Pin µMAX Package
Industrial Control
Ordering Information
PART
TEMP RANGE
-40°C to +1ꢀ2°C
-40°C to +1ꢀ2°C
-40°C to +1ꢀ2°C
-40°C to +1ꢀ2°C
-40°C to +1ꢀ2°C
-40°C to +1ꢀ2°C
-40°C to +1ꢀ2°C
-40°C to +1ꢀ2°C
PIN-PACKAGE
8 µMAX
SPREAD SPECTRUM
Center
OUTPUT FREQUENCY (MHz)
DS1091LUA+0ꢀ7
DS1091LUA+033
DS1091LUA+066
DS1091LUA+xxx
DS1091LUB+0ꢀ7
DS1091LUB+033
DS1091LUB+066
DS1091LUB+xxx
+Denotes lead-free package.
ꢀ7.0
8 µMAX
Center
33.3
8 µMAX
Center
66.6
8 µMAX
Center
Custom (Contact Factory)
8 µMAX
Down
ꢀ7.0
8 µMAX
Down
33.3
66.6
8 µMAX
Down
8 µMAX
Down
Custom (Contact Factory)
xxx Denotes factory-programmed custom frequencies.
Email Custom_EconOscillators_Info@dalsemi.com for information/questions concerning custom frequencies.
Typical Operating Circuit
Pin Configuration
V
CC
f
OUT
TOP VIEW
DR
OUT
8
7
1
2
V
CC
N.C.
V
CC
OUT
1
2
3
4
8
7
6
5
DR
V
N.C.
N.C.
SEL0
CC
DECOUPLING
CAPACITORS
GND
SEL1
GND
SEL1
N.C.
DS1091L
DS1091L
V
CC
3
4
6
5
SEL0
µMAX
8 µMAX
______________________________________________ Maxim Integrated Productꢂ
1
For pricing, delivery, and ordering information, pleaꢂe contact Maxim/Dallaꢂ Direct! at
1-888-629-4642, or viꢂit Maxim’ꢂ webꢂite at www.maxim-ic.com.
Automotive Temperature Range
Spread-Spectrum Econoscillator
ABSOLUTE MAXIMUM RATINGS
Voltage on V
Relative to Ground.......................-0.5V to +6.0V
Operating Temperature Range .........................-40°C to +125°C
Storage Temperature Range.............................-55°C to +125°C
Soldering Temperature...................See J-STD-020 Specification
CC
Voltage on DR, SEL0, SEL1 Relative
to Ground*..............................................-0.5V to (V
+ 0.5V)
CC
*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.
DS091L
RECOMMENDED OPERATING CONDITIONS
(T = -40°C to +125°C.)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
3.0
TYP
MAX
UNITS
Supply Voltage
V
(Note 1)
3.3
3.6
V
CC
High-Level Input Voltage
(SEL0, SEL1, DR)
0.7 x
V
+
CC
0.3
V
V
V
IH
V
CC
Low-Level Input Voltage
(SEL0, SEL1, DR)
0.3 x
V
V
-0.3
IL
CC
DC ELECTRICAL CHARACTERISTICS
(T = -40°C to +125°C; V
= +3.0V to +3.6V, unless otherwise noted.)
A
CC
PARAMETER
SYMBOL
CONDITIONS
= 3.0V
MIN
TYP
MAX
UNITS
High-Level Output Voltage (OUT)
Low-Level Output Voltage (OUT)
V
I
I
= -4mA, V
= 4mA
2.4
V
V
OH
OH
CC
V
0.4
1
OL
OL
High-Level Input Current
(SEL0, SEL1, DR)
I
IH
V
V
= 3.6V
µA
CC
Low-Level Input Current
(SEL0, SEL1, DR)
I
IL
= 0
IL
-1
µA
Supply Current (Active)
I
(Note 2)
16
mA
CC
AC ELECTRICAL CHARACTERISTICS
(T = -40°C to +125°C; V
= +3.0V to +3.6V, unless otherwise noted.)
A
CC
PARAMETER
SYMBOL
CONDITIONS
MIN
0.130
-0.25
-1.75
-1.2
TYP
MAX
66.6
+0.25
+1.75
+1.2
0.1
UNITS
Output Frequency Range
f
(Note 3)
= 3.3V, T = +25°C
MHz
OUT
V
0
CC
A
Output Center Frequency Tolerance
Δf
OUT
Across T and V
CC
%
A
0°C to +70°C, across V
(Note 4)
CC
Power-Up Time
t
ms
pF
PU
Load Capacitance
C
15
50
L
2
_____________________________________________________________________
Automotive Temperature Range
Spread-Spectrum Econoscillator
DS091L
AC ELECTRICAL CHARACTERISTICS (continued)
(T = -40°C to +125°C; V
= +3.0V to +3.6V.)
A
CC
PARAMETER
SYMBOL
CONDITIONS
< 33.3MHz (Note 3)
≥ 33.3MHz (Note 3)
MIN
TYP
MAX
UNITS
%
50
Duty Cycle
Jitter (RMS), 50MHz
40
60
0.3
%
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 C = 15pF, V
= 3.6V, T = 25°C, f
= 66.6MHz, no dither.
L
CC
A
OUT
Note 3: No dither.
Note 4: Guaranteed by design.
Note 5: For aging characteristics, contact factory.
Typical Operating Characteristics
(T = +25°C, V
= 3.3V, unless otherwise noted.)
A
CC
FREQUENCY VARIATION (%)
FREQUENCY VARIATION (%)
vs. VOLTAGE
I
CC
vs. TEMPERATURE
vs. TEMPERATURE
0.25
0.20
9.2
9.0
8.8
8.6
8.4
8.2
8.0
7.8
7.6
7.4
1.75
1.25
V
= 3.3V
V
= 3.6V
CC
CC
NO DITHER
0.15
0.75
0.10
0.05
f
= 66MHz
V
= 3.3V
OUT
CC
0.25
f
= 130kHz
OUT
0.00
-0.25
-0.75
-1.25
-1.75
f
= 66MHz
OUT
-0.05
-0.10
-0.15
-0.20
-0.25
f
= 130kHz
OUT
V
= 3.0V
50
CC
NO DITHER
3.4
-40
-10
20
80
110
-40
-10
20
50
80
110
3.0
3.1
3.2
3.3
(V)
3.5
3.6
TEMPERATURE (°C)
TEMPERATURE (°C)
V
CC
DUTY CYCLE vs. V
DUTY CYCLE vs. TEMPERATURE
CC
52.0
51.5
51.0
50.5
50.0
49.5
49.0
48.5
48.0
60
58
56
54
52
50
48
46
44
42
40
f
= 66MHz
= 130kHz
OUT
f
= 66MHz
OUT
f
OUT
f
= 130kHz
OUT
NO DITHER
3.4
NO DITHER
85 110
3.0
3.1
3.2
3.3
(V)
3.5
3.6
-40 -15
10
35
60
V
TEMPERATURE (°C)
CC
_____________________________________________________________________
3
Automotive Temperature Range
Spread-Spectrum Econoscillator
Typical Operating Characteristics (continued)
(T = +25°C, V
A
= 3.3V, unless otherwise noted.)
CC
SPECTRUM ATTENUATION vs. FREQUENCY
AT DIFFERENT DITHER AMPLITUDES
OUTPUT RISE TIME
OUTPUT FALL TIME
5
0
3.5
3.5
RBW = 120kHz
CENTER DITHER
f
= 33.3MHz
0%
OUT
3.0
2.5
3.0
2.5
DS091L
±1%
8dB
RISE TIME
= 1.02ns
TYPICAL
AT 12pF LOAD
FALL TIME
= 1.13ns
TYPICAL
AT 12pF LOAD
-5
11dB
±2%
±4%
14dB
-10
-15
-20
-25
-30
-35
2.0
1.5
1.0
0.5
0.0
2.0
1.5
1.0
0.5
0.0
34.9
31.9 32.4
32.9 33.4
33.9
34.4
TIME (ns)
TIME (ns)
FREQUENCY (MHz)
Pin Description
PIN
NAME
OUT
FUNCTION
µMAX8
1
2
Spread-Spectrum Clock Output
Supply Voltage
V
CC
3
GND
SEL1
SEL0
N.C.
DR
Ground
4
Spread Spectrum Dither Magnitude Select Inputs. Selects dither magnitude (see Table 1).
5
6, 7
8
No Connection
Spread-Spectrum Dither Rate Selector. Selects dither rate (see Table 2).
4
_____________________________________________________________________
Automotive Temperature Range
Spread-Spectrum Econoscillator
DS091L
Block Diagram
DS1091L
V
CC
f
MOSC
FACTORY-PROGRAMMED
MASTER OSCILLATOR
V
CC
f
OUT
f
f
DITHER
MOSC
OUT
TRIANGLE WAVE GENERATOR
(DITHER %)
GND
DITHER RATE DIVIDER
DR
IS THE MASTER OSCILLATOR FREQUENCY.
SEL1
SEL0
WHERE f
MOSC
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.
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.
Table 1.
DITHER MAGNITUDE
SEL1
SEL0
LOGIC LEVEL LOGIC LEVEL
DS1091LA
No Dither
1%
DS1091LB
No Dither
-2%
0
0
1
1
0
1
0
1
The DS1091L is shipped from the factory programmed
to a customer-specified frequency.
2%
-4%
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%).
4%
-8%
Table 2.
OUTPUT FREQUENCY f
(MHz)
OUT
n
DR = LOGIC DR = LOGIC
f
(min)
f
(max)
OUT
The two select pins SEL0 and SEL1 provide a means of
selecting the dither magnitudes as follows:
OUT
LEVEL 1
LEVEL 0
0.130
0.260
4
5
5
6
A triangle wave generator injects a control signal into
the master oscillator to dither its output. The dither rate
0.261
0.522
1.043
2.084
4.168
8.334
16.668
33.334
0.521
1.042
2.083
4.167
8.333
16.667
33.333
66.667
6
7
is a function of the output frequency, f
as well as the
OUT
setting of the DR pin (see the equation below). Figure 1
shows a plot of the output frequency versus time.
7
8
8
9
9
10
11
12
13
f
OUT
2
=
DITHERRATE
10
11
12
n
_____________________________________________________________________
5
Automotive Temperature Range
Spread-Spectrum Econoscillator
Application Information
IF DITHER AMOUNT = 0%
PROGRAMMED f
+
OUT
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
(1%, 2%, OR 4% OF f
)
OUT
DITHER
PROGRAMMED f
AMOUNT
(±1%, ±2%,
OR ±4%)
OUT
-
)
PROGRAMMED f
(1%, 2%, OR 4% OF f
OUT
OUT
1
capacitor, and mount it as close as possible to the V
CC
DITHER FREQ
and GND pins of the IC to minimize lead inductance.
DS091L
Requesting Custom Frequencies
Email Custom_EconOscillators_Info@dalsemi.com for
information/questions concerning custom frequencies.
TIME
Figure 1A. Center Dithered
Chip Topology
TRANSISTOR COUNT: 4887
Power-Up
Upon the application of power, the DS1091L output is
SUBSTRATE CONNECTED TO GROUND
held in the low state until t
has elapsed. This
PU
removes any possibility of erroneous output transitions
during initial power-up.
Package Information
For the latest package outline information, go to
www.maxim-ic.com/DallasPackInfo.
DS1091L Frequency Spreading Profile as a
Function of Dither %
IF DITHER AMOUNT = 0%
PROGRAMMED f
OUT
DITHER
AMOUNT
(-2%, -4%,
OR -8%)
PROGRAMMED f
(2%, 4%, OR 8% OF f
-
)
OUT
OUT
1
DITHER FREQ
TIME
Figure 1B. Down Dithered
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.
6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2006 Maxim Integrated Products
is a registered trademark of Maxim Integrated Products, Inc.
is a registered trademark of Dallas Semiconductor Corporation.
Springer
相关型号：
©2020 ICPDF网 联系我们和版权申明