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FMS3818
Triple Video D/A Converters
3 x 8 bit, 180 Ms/s Features
2.5% gain matching 0.5 LSB linearity error Internal bandgap voltage reference Low glitch energy Single 3.3 Volt power supply

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 37.5 loads corresponding to doubly-terminated 50 75 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.

Applications
PC Graphics Video signal conversion RGB YCBCR Composite, Y, C

Block Diagram
SYNC BLANK SYNC IOS

G7-0

8

8 bit D/A Converter

IOG

B7-0

8

8 bit D/A Converter

IOB

R7-0 CLK

8

8 bit D/A Converter

IOR COMP RREF VREF

1.25V Ref

REV. 1.2.3 December 2004

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FMS3818 DATASHEET