MC44251 Datasheet, PDF (1/18 Pages) Motorola, Inc – Triple 8-Bit Video ADC Three-State Outputs

MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Advance Information
Triple 8-Bit Video ADC
Three-State Outputs
CMOS
The MC44251 contains three independent parallel analog–to–digital flash
converters (ADC). Each ADC consists of 256 latching comparators and an
encoder. Video may be ac or dc coupled. With ac coupling, input clamping
provides for internal dc restoration. The MC44251 also contains a dithering
generator for video processing performance enhancements.
The MC44251 is especially suitable as a front–end converter in TV–picture
digital processing (picture–in–picture, frame storage, etc.). The high speed
conversion rate of the ADC is suitable for video bandwidth of well over 6 MHz.
• 18 MHz Maximum Sampling Rate
• Three–State Output Buffers
• Output Latching Minimizes Skew
• Input Clamps Suitable for RGB and YUV Applications
• Built–In Dither Generator with Subsequent Digital Correction
• Single 5–Volt Power Supply
• Operating Temperature Range: – 40 to + 85°C
• VTN and HZ Input Threshold Hysteresis Built–In
SIMPLIFIED BLOCK DIAGRAM OF ONE OF THE ADCs
VDD(R)
RTOP
Order this document
by MC44251/D
MC44251
FN SUFFIX
44–LEAD PLCC
CASE 777
44 ₁
FU SUFFIX
44
44–LEAD QFP
1
CASE 824A
ORDERING INFORMATION
MC44251FN PLCC
MC44251FU QFP
NOTE:
The FN package is not
recommended for new designs.
It is scheduled for phase out
in late 1996.
RMID
8
Σ
8
8
LATCH _DATA
OUTPUTS
RBOT
CLOCK
Ibias
ANALOG INPUT
CLAMP
HZ
VTN
MODE
CS
DITHERING
GENERATOR
This document contains information on a new product. Specifications and information herein are subject to change without notice.
REV 4
7/96
©_MOMo_Tto_Oro_Rla,_OIn_Lc._A1996
MC44251
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