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MC44251

Motorola
Part Number MC44251
Manufacturer Motorola
Description Triple 8-Bit Video ADC Three-State Outputs
Published Apr 29, 2005
Detailed Description MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by MC44251/D Advance Information Triple 8-Bit Video ADC Thr...
Datasheet PDF File MC44251 PDF File

MC44251
MC44251

Overview
MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by MC44251/D 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 44 1 MC44251 FN SUFFIX 44–LEAD PLCC CASE 777 44 1 FU SUFFIX 44–LEAD QFP CASE 824A ORDERING INFORMATION MC44251FN MC44251FU PLCC QFP NOTE: The FN package is not recommended for new designs.
It is scheduled for phase out in late 1996.
SIMPLIFIED BLOCK DIAGRAM OF ONE OF THE ADCs VDD(R) RTOP ENCODER 8 Σ 8 LATCH RMID 8 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 © Motorola, Inc.
1996 MOTOROLA MC44251 1 PIN ASSIGNMENTS PLCC VDD(D) B6 B5 B4 VSS(D) VDD(A) MODE B3 B2 B1 B0 QFP VDD(D) B6 B5 B4 VSS(D) VDD(A) MODE B3 B2 B1 B0 6 5 4 3 2 1 44 43 42 41 40 VDD(D) 12 R1 13 R2 14 VDD(D) 18 R1 19 R2 20 R3 21 VSS(D) R3 15 VSS(D) 22 23 24 25 26 27 28 R7 VSS(A) ABSOLUTE MAXIMUM RATINGS Symbol VDD(A), VDD(D), VDD(R) Vin Iin Iout Tstg Characteristic DC...


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