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DS1081LのメーカーはMaxim Integrated Productsです、この部品の機能は「Spread-Spectrum Clock Modulator」です。 |
部品番号 | DS1081L |
| |
部品説明 | Spread-Spectrum Clock Modulator | ||
メーカ | Maxim Integrated Products | ||
ロゴ | |||
このページの下部にプレビューとDS1081Lダウンロード(pdfファイル)リンクがあります。 Total 5 pages
Rev 0; 4/07
20MHz to 134MHz Spread-Spectrum
Clock Modulator for LCD Panels
General Description
The DS1081L is a spread-spectrum clock modulator IC
that reduces EMI in high clock-frequency-based, digital
electronic equipment.
Using an integrated phase-locked loop (PLL), the
DS1081L accepts an input clock signal in the range of
20MHz to 134MHz and delivers a spread-spectrum mod-
ulated output clock signal. The PLL modulates, or dithers,
the output clock about the center input frequency at a
pin-selectable magnitude and dither rate, allowing direct
EMI control and optimization. In addition, through an
enable pin the dithering can be enabled or disabled for
easy comparison of system performance during EMI test-
ing. This same input pin also allows the DS1081L output
to be tri-stated.
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.
Thewww.DataSheet4U.com DS1081L is provided in an 8-pin TSSOP package
and operates over a full automotive temperature range
of -40°C to +125°C.
Applications
LCD Panels for TVs, Desktop Monitors, and
Notebook and Tablet PCs
Automotive Telematics and Infotainment
Printers
Pin Configuration and Typical Operating Circuit appear at
end of data sheet.
Block Diagram
Features
♦ Modulates a 20MHz to 134MHz Clock with Center
Spread-Spectrum Dithering
♦ Selectable Spread-Spectrum Modulation
Magnitudes of:
±0.5%
±1.0%
±1.5%
±2.0%
♦ Low 75ps Cycle-to-Cycle Jitter
♦ Spread-Spectrum Disable Mode
♦ Pin Compatible with Alliance/PulseCore
Semiconductor P2040 Series Devices
♦ Clock Output Disable
♦ Low Cost
♦ Low Power Consumption
♦ 3.3V Single Voltage Supply
♦ -40°C to +125°C Temperature Range
♦ Small 8-Pin TSSOP Package
Ordering Information
PART
TEMP RANGE
DS1081LE+
-40°C to +125°C
DS1081LE+T
-40°C to +125°C
+Denotes lead-free package.
T Denotes tape-and-reel.
PIN-PACKAGE
8 TSSOP
8 TSSOP
Pin Configuration
CLKIN
fIN = 20MHz TO
134MHz
CRSEL
SMSEL1
SMSEL2
DS1081L
PLL WITH CENTER-
DITHERED
SPREAD
SPECTRUM
VCC
VCC
SSO
fSSO = 20MHz to
134MHz (DITHERED)
CONFIGURATION
DECODE AND
CONTROL
ENABLE
LOGIC
SSEN
GND
TOP VIEW
CLKIN 1
SMSEL1 2
SMSEL2 3
GND 4
DS1081L
8 VCC
7 CRSEL
6 SSO
5 SSEN
TSSOP
(4.40mm)
______________________________________________ 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.
1 Page 20MHz to 134MHz Spread-Spectrum
Clock Modulator for LCD Panels
(TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics
SUPPLY CURRENT vs. SUPPLY VOLTAGE
14
12 CLKIN = 134MHz
10 CLKIN = 66MHz
8
6 CLKIN = 20MHz
4
2
0
3.0 3.1 3.2 3.3 3.4 3.5 3.6
SUPPLY VOLTAGE (V)
DUTY CYCLE vs. TEMPERATURE
60
CLKIN = 66MHz
58
56
54
52
50
48
46
44
42
40
-40 -20
0 20 40 60 80 100 120
TEMPERATURE (°C)
SUPPLY CURRENT vs. TEMPERATURE
14
12 CLKIN = 134MHz
10 CLKIN = 66MHz
8
CLKIN = 33MHz
6
4
2
0
-40 -20
0 20 40 60 80 100 120
TEMPERATURE (°C)
DUTY CYCLE vs. SUPPLY VOLTAGE
60
CLKIN = 66MHz
58
56
54
52
50
48
46
44
42
40
3.0
3.1 3.2 3.3 3.4 3.5
SUPPLY VOLTAGE (V)
3.6
SUPPLY CURRENT vs. FREQUENCY
14
12
10 VCC = 3.6V
8
6 VCC = 3.0V
4
2
0
20 36 56 76 96 116 134
FREQUENCY (MHz)
SPECTRUM ATTENUATION vs. FREQUENCY
AT DIFFERENT DITHER AMPLITUDES
±1% 0.5% fOUT = 40MHz
±1.5%
±2%
3dB
6dB
4.5dB
fOUT = 40MHz
RBW = 120KHz
CENTER DITHER
FREQUENCY (MHz)
_____________________________________________________________________ 3
3Pages | |||
ページ | 合計 : 5 ページ | ||
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PDF ダウンロード | [ DS1081L データシート.PDF ] |
データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。 |
部品番号 | 部品説明 | メーカ |
DS1081L | Spread-Spectrum Clock Modulator | Maxim Integrated Products |