FMS3818 Datasheet, PDF (1/13 Pages) Fairchild Semiconductor – Triple Video D/A Converter 3 x 8 bit, 180 Ms/s

FMS3818
Triple Video D/A Converter
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-
terminated 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 I_OS
8
G_7-0
8 bit D/A
Converter
IO_G
8
B_7-0
8 bit D/A
Converter
IO_B
8
R_7-0
CLK
8 bit D/A
Converter
+1.25V
Ref
IO_R
COMP
R_REF
V_REF
REV. 1.2.2 11/11/01