DS1081LE データシートの表示（PDF） - Maxim Integrated
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DS1081LE Datasheet PDF : 6 Pages
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20MHz to 134MHz Spread-Spectrum
Clock Modulator for LCD Panels
Spread-Spectrum Enable
On power-up, the output clock (SSO) remains three-stat-
ed until the internal PLL reaches a stable frequency. The
SSEN input can be used to disable the spread-spec-
trum modulation and to three-state the SSO output. If the
SSEN pin is pulled high, the spread-spectrum modula-
tion is turned off, but the device still uses the internal
PLL to generate the clock signal at SSO. If the SSEN pin
is open, the output is three-stated.
Applications Information
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.
fIN + (0.5%, 1.0%, 1.5%, OR 2.0% OF fIN)
fIN
fIN - (0.5%, 1.0%, 1.5%, OR 2.0% OF fIN)
fSSO
1
DITHER CYCLE
RATE
IF SSEN = 1
DITHER AMOUNT
(±0.5%, ±1.0%, ±1.5%, OR ±2.0%)
TIME
CLKIN RANGE (MHz) DITHER RATE
66 TO 134
33 TO 80
20 TO 38
fIN/2048
fIN/1024
fIN/512
Figure 1. Spread-Spectrum Frequency Modulation
fIN = 20MHz TO
134MHz
CLKIN
SMSEL1
SMSEL2
GND
DS1081L
VCC
CRSEL
SSO
SSEN
Typical Operating Circuit
VCC
fSSO
DITHERED
DECOUPLING
CAPACITOR
NOTE: IN THE ABOVE CONFIGURATION WITH SMSEL1, SMSEL2, AND SSEN CONNECTED TO GND AS WELL AS
CRSEL CONNECTED TO VCC AND SSEN CONNECTED TO GND, THE DEVICE IS CONFIGURED WITH A
SPREAD-SPECTRUM MAGNITUDE OF ±2.0%, AND ALLOWS A CLKIN BETWEEN 20MHz and 38MHz.
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
8 TSSOP
PACKAGE CODE
H8+3
OUTLINE NO.
21-0175
LAND PATTERN NO.
90-0248
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