FMS3818KRC Просмотр технического описания (PDF) - Fairchild Semiconductor

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FMS3818KRC

Triple Video D/A Converters 3 x 8 bit, 180 Ms/s

Fairchild Semiconductor 

FMS3818

Triple Video D/A Converters

3 x 8 bit, 180 Ms/s

www.fairchildsemi.com

Features

• ±2.5% gain matching

• ±0.5 LSB linearity error

• Internal bandgap voltage reference

• Low glitch energy

• Single 3.3 Volt power supply

Applications

• PC Graphics

• Video signal conversion

– RGB

– YCBCR

– Composite, Y, C

Description

The FMS3818 is a low-cost triple D/A converter, tailored to

fit graphics and video applications where speed is critical.

CMOS-level inputs are converted to analog current outputs

that can drive 25–37.5Ω loads corresponding to doubly-termi-

nated 50–75Ω loads. A sync current following SYNC input

timing is added to the IOG output. BLANK will override

RGB inputs, setting IOG, IOB and IOR currents to zero when

BLANK = L. Although appropriate for many applications

the internal 1.25V reference voltage can be overridden by the

VREF input.

Few external components are required, just the current

reference resistor, current output load resistors, bypass

capacitors and decoupling capacitors.

Package is a 48-lead LQFP. Fabrication technology is

CMOS. Performance is guaranteed from 0 to 70°C.

Block Diagram

SYNC

BLANK

SYNC IOS

8

G7-0

8 bit D/A

Converter

IOG

8

B7-0

8 bit D/A

Converter

IOB

8

R7-0

CLK

8 bit D/A

Converter

+1.25V

Ref

IOR

COMP

RREF

VREF

REV. 1.2.3 December 2004

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