Rainbow-electronics DS1081L Bedienungsanleitung PDF herunterladen (Seite 5)

DS1081L

20MHz to 134MHz Spread-Spectrum

Clock Modulator for LCD Panels

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 _____________________

is a registered trademark of Dallas Semiconductor Corporation.

Spread-Spectrum Enable

On power-up, the output clock (SSO) remains tri-stated

until the internal PLL reaches a stable frequency. The

SSEN input can be used to disable the spread-spec-

trum modulation and to tri-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 floated, the output will be tri-stated.

Application 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 V

and GND pins of the IC to minimize lead inductance.

+ (0.5%, 1.0%, 1.5%, OR 2.0% OF f

)

- (0.5%, 1.0%, 1.5%, OR 2.0% OF f

)

SSO

TIME

DITHER CYCLE

RATE

DITHER AMOUNT

(±0.5%, ±1.0%, ±1.5%, OR ±2.0%)

CLKIN RANGE (MHz) DITHER RATE

66 TO 134 f

/2048

33 TO 80 f

/1024

20 TO 38 f

/512

IF SSEN = 1

Figure 1. DS1081L Spread-Spectrum Frequency Modulation

CLKIN

SMSEL1

SMSEL2

GND

CRSEL

DECOUPLING

CAPACITOR

SSO

= 20MHz TO

134MHz

NOTE: IN THE ABOVE CONFIGURATION WITH SMSEL1, SMSEL2, AND SSEN CONNECTED TO GND AS WELL AS

CRSEL CONNECTED TO V

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.

DS1081L

SSO

DITHERED

SSEN

Typical Operating Circuit

Package Information

For the latest package outline information, go to www.maxim-ic.com/DallasPackInfo.

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