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PDF AD9701 Data sheet ( Hoja de datos )
| Número de pieza | AD9701 | |
| Descripción | 250 MSPS Video Digital-to-Analog Converter | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AD9701 (archivo pdf) en la parte inferior de esta página. Total 6 Páginas | ||
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FEATURES
250 MSPS Update Rate
Low Glitch Impulse
Complete Composite Functions
Internal Voltage Reference
Single –5.2 V Supply
APPLICATIONS
Raster Scan Displays
Color Graphics
Automated Test Equipment
TV Video Reconstruction
250 MSPS Video
Digital-to-Analog Converter
AD9701
FUNCTIONAL BLOCK DIAGRAM
GENERAL DESCRIPTION
The AD9701 is a high speed, 8-bit digital-to-analog converter
with fully integrated composite video functions. High speed
ECL input registers provide synchronous operation of data and
control functions up to 250 MSPS.
The AD9701 incorporates onboard control functions including
horizontal sync, blanking, reference white level and a 10%
bright signal for highlighting. The setup level is also adjustable
from 0 IRE units to 20 IRE units through the control pin. An
internal voltage reference allows the AD9701 to operate as a
stand-alone video reconstruction DAC.
The AD9701 is available as an industrial temperature range
device, –25°C to +85°C, and as an extended temperature range
device, –55°C to +125°C. Both grades of the AD9701 are pack-
aged in a 22-pin ceramic DIP with the extended temperature
device also available in a 28-pin LCC package.
PIN CONFIGURATIONS
REV. A
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 implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
World Wide Web Site: http://www.analog.com
Fax: 617/326-8703
© Analog Devices, Inc., 1996
1 page  
AD9701
DIE LAYOUT AND MECHANICAL INFORMATION
Die Dimensions . . . . . . . . . . . . . . . . 107 ϫ 104 ϫ 15 (± 2) mils
Pad Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 ϫ 4 mils
Metalization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Aluminum
Backing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . None
Substrate Potential . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –VS
Passivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Oxynitride
Die Attach . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Gold Eutectic
Bond Wire . . . . . . . 1.25 mil Aluminum; Ultrasonic Bonding or
1 mil Gold; Gold Ball Bonding
APPLICATIONS INFORMATION
Raster scan video displays image data on a line by line basis,
with timing and control signals inserted between the lines. The
control signals include the horizontal synchronization pulses,
which are used to align the display circuitry at the beginning of
each line. After the complete video image is displayed on the
monitor, the process begins again with the next image. The ver-
tical reset pulse(s) that initiate this timing sequence are located
between each video image.
signals are designed to fall below the blanking level so as not to
be seen on the monitor. The actual image data is located above
the blanking level and it may be further separated from the tim-
ing signal by the setup level. The setup level is simply a buffer
zone between the timing and image data.
Generation of the timing signals for the AD9701 is controlled
by the COMPOSITE BLANKING and the COMPOSITE
SYNC inputs. In normal operation, the output level of the
AD9701 is forced to the blanking level (black) with the COM-
POSITE BLANKING control so that when the synchronization
occurs, it will not interfere (be seen) with the monitor image.
The COMPOSITE SYNC control forces the output level below
the blanking level, generating the synchronization pulse.
The “grey scale” is the image intensity range located above the
blanking level by the amount of the setup level. The setup level
is “reference black,” the darkest displayable picture intensity.
The top of the “grey scale” is “reference white” or the brightest
picture intensity. As an 8-bit device, the AD9701 divides the
“gray scale” into 256 individual levels.
Normal raster scan waveforms divide the region between the
blanking level and reference white into 100 IRE units (Interna-
tional Radio Engineers). The setup level can range from 0 to 20
IRE units but typically is around 10 IRE units, and the synchro-
nization pulse level typically falls 40 IRE units below the blank-
ing level. For the AD9701, the reference white level is 10 IRE
units below the full-scale output range (0 mAOUT).
In terms of priority, the REFERENCE WHITE control over-
rides the data inputs, but both COMPOSITE SYNC and
COMPOSITE BLANKING override the data inputs and the
REFERENCE WHITE control. A fourth control is active at all
times, 10% BRIGHT, which adds approximately 10 IRE units
to the output level no matter what the input state of the
AD9701. The 10% BRIGHT control is primarily used to high-
light areas of the video image.
As with any high-speed device, the AD9701 requires a substan-
tial low impedance ground plane and high quality ground con-
nections to achieve the best performance. Performance can also
be improved with adequate power supply decoupling near the
supply pins of the AD9701. In ECL mode, the output of the
AD9701 is designed to drive 75 Ω cable directly, with 75 Ω ter-
minations to ground at both ends of the cable. For TTL con-
figurations, the output should be terminated to +5.0 V through
an 82 Ω resistor (see circuit below).
Raster Graphics Configuration for TTL Systems
The image data is distinguished from the timing information by
its location relative to the blanking level. The blanking reference
level is at the blackest extreme of the image data and all timing
REV. A
–5–
Standard Reconstruction Configuration
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet AD9701.PDF ] | |
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