DS1083LR-U+ [MAXIM]
Analog Circuit, 1 Func, PDSO6, LEAD FREE, TSOT-23, 6 PIN;
| 型号： | DS1083LR-U+ |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Analog Circuit, 1 Func, PDSO6, LEAD FREE, TSOT-23, 6 PIN 光电二极管 |
| 文件： | 总5页 (文件大小：147K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Rev 0; 5/07
16MHz to 134MHz Spread-Spectrum
Clock Modulator for LCD Panels
DS1083L
General Description
Features
The DS1083L is a spread-spectrum clock modulator IC
that reduces EMI in high-clock, frequency-based, digi-
tal electronic equipment.
♦ Modulates a 16MHz to 134MHz Clock with Center
Spread-Spectrum Dithering
♦ Selectable Spread-Spectrum Modulation
Using an integrated phase-locked loop (PLL), the
DS1083L accepts an input clock signal in the range of
16MHz to 134MHz and delivers a spread-spectrum
modulated output clock signal. The PLL modulates, or
dithers, the output clock about the center input frequen-
cy at a pin-selectable magnitude. The DS1083L auto-
matically adjusts the dither rate based on the input
clock frequency to maximize the EMI reduction.
Magnitudes of:
±±0.5
±15
±10.5
±ꢀ5
♦ Low 7.ps Cycle-to-Cycle Jitter
♦ Automatic Dither Cycle Rate Adjustment to
By dithering the system clock, all the address, data,
and timing signals generated from this signal are also
dithered so that the measured EMI at the fundamental
and harmonic frequencies is greatly reduced. This is
accomplished without changing clock rise/fall times or
adding the space, weight, design time, and cost asso-
ciated with mechanical shielding.
Maximize EMI Reduction
♦ Low Cost
♦ Low Power Consumption
♦ 303V Single Voltage Supply
♦ -4±°C to +1ꢀ.°C Operating Temperature Range
♦ Small 6-Lead Thin SOTꢀ3 Package
The DS1083L is provided in a low-cost, space-saving,
6-lead thin SOT23 package and operates over a full
automotive temperature range of -40°C to +125°C.
Applications
LCD Panels for TVs, Desktop Monitors, Notebook
and Tablet PCs
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
DS1083LR+T
-40°C to +125°C
6 Thin SOT23
Automotive Telematics and Infotainment
Printers
+Denotes a lead-free package.
T = Tape and reel.
Pin Configuration and Typical Operating Circuit appear at
end of data sheet0
Block Diagram
DS1083L
SSO
CLKIN
PLL WITH CENTER-
SPREAD
DITHERING
f
= 16MHz TO
IN
f
= 16MHz to
SSO
134MHz
V
CC
134MHz (DITHERED)
V
CC
VCC
CLOCK RATE
DETECT
R
PU
R
PU
CONFIGURATION
DECODE AND
CONTROL
GND
SMSEL1
SMSEL2
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-6ꢀ9-464ꢀ,
or visit Maxim’s website at www0maxim-ic0com0
16MHz to 134MHz Spread-Spectrum
Clock Modulator for LCD Panels
ABSOLUTE MAXIMUM RATINGS
Voltage Range on VCC Relative to GND.............-0.5V to +3.63V
Voltage Range on Any Lead Relative
Storage Temperature Range.............................-55°C to +125°C
Soldering Temperature...........................Refer to the IPC/JEDEC
J-STD-020 Specification.
to GND................-0.5V to (V
+ 0.5V), not to exceed +3.63V
CC
Operating Temperature Range .........................-40°C to +125°C
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.
DS1083L
RECOMMENDED OPERATING CONDITIONS
(T = -40°C to +125°C, unless otherwise noted.)
A
PARAMETER
Supply Voltage
SYMBOL
CONDITIONS
MIN
3.0
TYP
MAX
UNITS
V
CC
V
CC
(Note 1)
3.6
V
0.7 x
V
+
0.3
CC
SMSEL1/SMSEL2 Input Logic 1
SMSEL1/SMSEL2 Input Logic 0
SSO Load
V
V
V
IH
V
CC
0.3 x
V
V
-0.3
IL
CC
f
< 80MHz
15
7
SSO
C
pF
L
80MHz ꢀ f
< 134MHz
SSO
CLKIN Frequency
CLKIN Duty Cycle
f
16
40
134
60
MHz
%
IN
f
INDC
V
CC
Power-Up Time
t
GND to V
200
ms
PV
CCMIN
DC ELECTRICAL CHARACTERISTICS
(V
CC
= +3.0V to +3.6V, T = -40°C to +125°C, unless otherwise noted.)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
60
TYP
MAX
UNITS
C = 7pF,
L
Supply Current
I
15
mA
CC
f
= 134MHz
= +25°C
A
IN
SMSEL1/SMSEL2 Pullup Resistance
SMSEL1/SMSEL2 Input Leakage
Low-Level Output Voltage (SSO)
High-Level Output Voltage (SSO)
R
I
T
100
140
80
kꢀ
μA
V
PU
IL
0V < V < V
IN
CC
V
I
I
= 4mA
= -4mA
0.4
OL
OH
OL
V
2.4
V
OH
AC ELECTRICAL CHARACTERISTICS
(V
CC
= +3.0V to +3.6V, T = -40°C to +125°C, unless otherwise noted.)
A
PARAMETER
SYMBOL
CONDITIONS
Measured at V /2
MIN
TYP
MAX
UNITS
%
SSO Duty Cycle
f
40
60
SSODC
CC
SSO Rise Time
t
C = 7pF
1
1
ns
R
L
SSO Fall Time
t
t
C = 7pF
L
ns
F
J
Peak Cycle-to-Cycle Jitter
T
A
= -40°C to +85°C, 10,000 cycles
75
ps
Note 1: All voltages referenced to ground. Currents into the IC are positive and currents out of the IC are negative.
ꢀ
_______________________________________________________________________________________
16MHz to 134MHz Spread-Spectrum
Clock Modulator for LCD Panels
DS1083L
Typical Operating Characteristics
(T = +25°C, unless otherwise noted.)
A
SUPPLY CURRENT vs. SUPPLY VOLTAGE
SUPPLY CURRENT vs. TEMPERATURE
CLKIN = 134MHz
SUPPLY CURRENT vs. FREQUENCY
12
10
8
12
10
8
12
10
8
CLKIN = 134MHz
CLKIN = 66MHz
V
V
= 3.6V
= 3.0V
CC
CC
CLKIN = 66MHz
CLKIN = 16MHz
CLKIN = 16MHz
6
6
6
4
4
4
2
2
2
0
0
0
3.0
3.1
3.2
3.3
3.4
3.5
3.6
-40 -20
0
20 40 60 80 100 120
16
36
56
76
96
116
134
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
FREQUENCY (MHz)
SPECTRUM ATTENUATION vs. FREQUENCY
AT DIFFERENT DITHER AMPLITUDES
DUTY CYCLE vs. TEMPERATURE
DUTY CYCLE vs. SUPPLY VOLTAGE
60
58
56
54
52
50
48
46
44
42
40
60
58
56
54
52
50
48
46
44
42
40
f
= 40MHz
CLKIN = 66MHz
0.5%
CLKIN = 66MHz
OUT
1%
1.5%
2%
3dB
6dB
4.5dB
f
= 40MHz
OUT
RBW = 120kHz
CENTER DITHER
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (°C)
3.0
3.1
3.2
3.3
3.4
3.5
3.6
FREQUENCY (MHz)
SUPPLY VOLTAGE (V)
_______________________________________________________________________________________
3
16MHz to 134MHz Spread-Spectrum
Clock Modulator for LCD Panels
Pin Description
PIN
1
NAME
CLKIN
GND
DESCRIPTION
Clock Input. 16MHz to 134MHz clock input (f ).
IN
2
Ground
3
Spread-Spectrum Clock Output. Outputs a center-dithered spread-spectrum version of the clock input at
CLKIN.
SSO
DS1083L
Spread-Spectrum Magnitude Select Inputs. These digital inputs select the desired spread-spectrum
magnitude as shown in the table below. Both inputs contain pullup resistors (R ) to V
.
PU
CC
4
SMSEL2
SMSEL2
SMSEL1
MAGNITUDE SELECTED (%)
0
0
1
1
0
1
0
1
±2
±1.5
±1
5
6
SMSEL1
VCC
±0.5
Supply Voltage
Detailed Description
Applications Information
The DS1083L modulates an input clock to provide a cen-
ter-dithered spread-spectrum output. A 16MHz to
134MHz clock is applied to the CLKIN pin. The PLL
dithers the output clock about its center frequency at a
user-selectable magnitude. The user is required to cycle
power to the device each time there is a change in the
input frequency, for the PLL to lock correctly. This
ensures proper output frequency and dither rate. The
desired spread-spectrum magnitude is selected using
input pins SMSEL1 and SMSEL2 (see the Pin Description
for details). The DS1083L is capable of generating
spread-spectrum clocks from 16MHz to 134MHz.
Power-Supply Decoupling
To achieve best results, it is highly recommended that a
decoupling capacitor is 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.
Chip Information
SUBSTRATE CONNECTED TO GROUND
Dither-Rate Selection
The output spread-spectrum dither rate is automatically
adjusted depending on the input frequency, to maxi-
mize EMI reduction.
The dither cycle rate is:
f /512, if f is between 16MHz and 33MHz
IN
IN
f /1024, if f is between 33MHz and 64MHz
IN
IN
f /2048, if f is between 64MHz and 134MHz
IN
IN
On power-up, the output clock (SSO) remains three-
stated until it reaches a stable frequency (f ). The
SSO
dither rate is selected by sampling the input clock at
power-up.
4
_______________________________________________________________________________________
16MHz to 134MHz Spread-Spectrum
Clock Modulator for LCD Panels
DS1083L
IF DITHER AMOUNT = 0%
f
+ (0.5%, 1%, 1.5%, OR 2% OF f
)
IN
IN
DITHER AMOUNT
( 0.5%, 1%, 1.5%, OR 2%)
f
IN
f
IN
- (0.5%, 1%, 1.5%, OR 2% OF f
)
IN
1
f
SSO
DITHER CYCLE
RATE*
TIME
*DITHER CYCLE RATE =
f
IN
f
IN
f
IN
/512, IF f = 16MHz TO 33MHz
IN
/1024, IF f = 33MHz TO 64MHz
IN
/2048, IF f = 64MHz TO 134MHz
IN
Figure 1. Spread-Spectrum Frequency Modulation
Typical Operating Circuit
V
CC
f
IN
= 16MHz TO
134MHz
CLKIN
VCC
DECOUPLING
CAPACITOR
SMSEL1
DS1083L
GND
SSO
f
SSO
SMSEL2
DITHERED
NOTE: IN THE ABOVE CONFIGURATION WITH SMSEL1 CONNECTED TO VCC AND SMSEL2 CONNECTED
TO GND, THE DEVICE WILL HAVE A SPREAD-SPECTRUM MAGNITUDE OF 1.5%.
Pin Configuration
Package Information
For the latest package outline information, go to
www0maxim-ic0com/packages.
TOP VIEW
+
PACKAGE TYPE
DOCUMENT NO0
ꢀ1-±114
CLKIN
GND
SSO
1
2
3
6
5
4
VCC
6 Thin SOT23
SMSEL1
SMSEL2
DS1083L
THIN SOT23
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 _____________________ .
© 2007 Maxim Integrated Products
is a registered trademark of Maxim Integrated Products, Inc.
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