LM2467 datasheet(13/43 Pages) NSC

部件名	LM2467

功能描述	150 MHz I2C Compatible RGB Preamplifier with Internal 254 Character OSD ROM, 512 Character RAM and 4 DACs

PDF	43 Pages

Scroll/Zoom	100%

制造商	NSC [National Semiconductor (TI)]

网页	http://www.national.com

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13 / 43 page

Pin Descriptions and Application Information (Continued)

No.

Pin Name

Schematic

Description

CLAMP

This pin accepts either TTL or CMOS logic

levels. The internal switching threshold is

approximately one-half of V

CC. An external

series resistor, R

31, of about 1K is recommended

to avoid overdriving the input devices. In any

event, R

EXT must be large enough to prevent the

voltage at pin 23 from going higher than V

CC or

below GND.

H Flyback

Proper operation requires current reversal. R

should be large enough to limit the peak current

at pin 24 to about +4 ma during blanking, and

−500 µA during scan. C

17 is usually needed for

logic level inputs and should be large enough to

make the time constant, R

HC17 significantly

larger than the horizontal period. R

34 and C8 are

typically 300

Ω and 330 pF when the flyback

waveform has ringing and needs filtering. C

may be needed to filter extraneous noise and

can be up to 100 pF.

LM2467 数据表(PDF) 13 Page - National Semiconductor (TI)

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