HDL-3805_15 Datasheet, PDF (1/6 Pages) Analog Devices – HYBRID VIDEO DIGITAL TO ANALOG CONVERTERS

ANALOG
W DEVICES
HybridVideo
Digital-to-AnalogConverters
PRELIMINARY DATA
FEATURES
Triple 8-Bit D/A with LUTs
115MHz Update Rates
RGB Composite Functions
Small Size (2.3" x 1.5")
latched Composite Functions
(HDl-3806)
APPLICATIONS
OBSOLETE RasterScan Displays
Color Graphics Systems
GENE~L DESCRIPTION
The HDL-3805 D/A Converter is a thick-film hybrid which
includes three AD9700 IC D/ A converters and three ECL random
access memory (RAM) look-up tables in a single package. It is
the smallest, lowest-power RGB (red, green, blue) video generator
available to video designers of high-resolution raster scan graphics
displays.
With eight bits of Gray scale resolution per channel, the user
Composite functions in the HDL units include Red Sync, Green
Sync, Blue Sync, Composite Blanking, Reference White, and
10% Bright. The ability of the devices to drive 75flloads directly
with a IV composite signal combines with these functions to
assure the outputs will be compatible with the general requirements
of EIA Standards RS-170 and RS-343.
The model HDL-3806 D/A Converter is a variation of the
HDL-3805 which includes synchronous composite functions and
has a total palette of 16.7 million colors. Since each of the three offers increased flexibility for the designer in a pin-for-pin com-
DACs has a 256 x 8 RAM, a total of 256 colors is available on
patible package.
each sweep. The write speed of the RAMS is sufficiently high
to rewrite the color map completely during vertical retrace, or
update smaller blocks of data during horizontal retrace.
All models of the HDL-3805 and HDL-3806 are housed in 46-
pin metal hybrid packages. Standard versions are rated over an
operating temperature range of - 25°C to + 85°C; for units with
this range and military screening, consult factory.
ABSOLUTE
IRE OUTPUT
- --------------- UNITS
t ₊₁₀₀
VOLTAgE
-71mV
1
-^71mV
---
10% BRIGHT LEVEL
- -- - REfERENCE WHITE
LEVEL IV,wl
REFERENCE BLACK
LEVEL IV"I
-- COMPOSITEBLANKING
LEVELIV,'
100 IRE UNITS. 71<mV
Idealized Composite Output Waveform
Information furnished by Analog Devices is believed to be accurate
and reliable. However, no responsibility is assumed by Analog Devices
for its use; nor for any infringements of patents or other rights of third
parties which may result from its use. No license is granted by implica-
tion or otherwise under any patent or patent rights of Analog Devices.
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