BT218KP Converter Datasheet
20 MSPS Monolithic CMOS 8-bit Flash Video A/D Converter
|Total Page||25 Pages|
This document contains information on a new product. The parametric informa-
tion, although not fully characterized, is the result of testing initial devices
20 MSPS Monolithic CMOS
8-bit Flash Video A/D Converter
The Bt218 is an 8-bit ﬂash A/D converter designed speciﬁcally for video digitiz-
ing applications. A ﬂash converter topology is used with 256 high-speed com-
parators in parallel to digitize the analog input signal.
Flexible input ranges enable NTSC and CCIR video signals to be digitized
without requiring a video ampliﬁer.
The TTL-compatible output data and OVERFLOW are registered synchro-
nously with the clock signal. The OE* three-states the D[7:0] outputs asynchro-
nously to CLOCK.
The ZERO input is used to zero the comparators, while CLAMP allows DC
restoration of an AC-coupled video signal (by forcing the VIN input to the volt-
age on the LEVEL pin).
The Bt218 contains 256 high-speed comparators, a 255-to-8 encoder, an out-
put register, and a resistor divider network. Of the 256 comparators, 255 are
used to digitize the analog signal; the additional comparator is used to generate
the OVERFLOW bit.
Functional Block Diagram
255 TO 8
• 20 MSPS operation
• Bt208 pin compatibility
• No video ampliﬁer requirement
• ±1/4 LSB typical DL error
• ±1/2 LSB typical IL error
• External zero and clamp control
• Overﬂow output
• On-Chip reference
• Output enable control
• TTL compatibility
• +5 V CMOS monolithic
• 24-pin 0.3" DIP or 28-pin PLCC
• Typical power dissipation: 500 mW
• Image processing
• Image capture
• Desktop publishing
• Graphic art systems
Brooktree® Brooktree Division • Rockwell Semiconductor Systems, Inc. • 9868 Scranton Road • San Diego, CA 92121-3707
619-452-7580 • 1-800-2-BT-APPS • FAX: 619-452-1249 • Internet: firstname.lastname@example.org • L218_C
Ambient Temperature Range
24-Pin 0.3” Plastic DIP
0˚ to +70˚C
28-Pin Plastic J-Lead
0˚ to +70˚C
Evaluation Board for the Bt218KP. Includes a Bt218KP30.
Copyright © 1997 Brooktree Corporation. All rights reserved.
Print date: December 1992
Brooktree reserves the right to make changes to its products or speciﬁcations to improve performance, reliability, or
manufacturability. Information furnished by Brooktree Corporation is believed to be accurate and reliable. However, no
responsibility is assumed by Brooktree Corporation for its use; nor for any infringement of patents or other rights of third parties
which may result from its use. No license is granted by its implication or otherwise under any patent or patent rights of Brooktree
Brooktree products are not designed or intended for use in life support appliances, devices, or systems where malfunction of a
Brooktree product can reasonably be expected to result in personal injury or death. Brooktree customers using or selling Brooktree
products for use in such applications do so at their own risk and agree to fully indemnify Brooktree for any damages resulting from
such improper use or sale.
Brooktree is a registered trademark of Brooktree Corporation. Product names or services listed in this publication are for
identiﬁcation purposes only, and may be trademarks or registered trademarks of their respective companies. All other marks
mentioned herein are the property of their respective holders.
Speciﬁcations are subject to change without notice.
PRINTED IN THE UNITED STATES OF AMERICA
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