AT76C101

Features:

• Compatible with the JPEG Baseline Standard as Defined by ISO IS 109 18-1
• Highly-integrated, Low-cost Single Chip Solution
• Up to 40 Mbytes/sec Sustained Compression Rate
• Maximum Processing Rate of 1.6 million pixels/sec
• Supports 8-bit Grayscale and YUV 4:2:2 Color Space Input and Output Formats
• Handles Images of Size up to 1024 x 1024 Pixels
• Fast DCT/IDCT Processor On-chip
• User-defined Quantization and Huffman Tables
• Support for Fast as well as Slow/Inexpensive Memories
• Provides Direct Interface for Microcontroller/Microprocessor Access


Application

The AT76C101 JPEG Processor is optimized for use in the following applications:
• Digital Cameras
• Color Printers and Plotters
• Low-cost Image Compression Systems
• Video Editing (3-4 frames/sec at CCIR 720 x 480 Image Resolution)



Pinout

Specifications

Symbol	Parameter	Min	Max	Unit	Conditions
Vcc	DC supply voltage	-0.3	4.6	V	Core and standard IOS
Vi	DC input voltage	-0.3	Vdd + 0.3V	V	or see +-IIk
Vo	DC output voltage		Vdd + 0.3V	V	or see +-IOk
+-IIk	DC input diode current		10	mA	Vi<-0.5V Vi>Vdd+0.5V
+-IOK	DC output diode current		10	mA	V0<-0.5V V0>Vdd+0.5V
IolMAX	Continuous output current		10	mA	Industrial
IohMAX	Continuous output current		10	mA	Industrial
tSH	Time of outputs shorted		5	sec
TA	Temperature range	-40	+85	C	Industrial
TSG	Storage Temperature	-65	+150	C

Description

The AT76C101 is an Image Compression/Decompression Processor that performs the JPEG Baseline Algorithm. The
system is capable of high quality compression and decompression of continues-tone color or monochrome images.

The AT76C101 performs the Discrete Cosine Transform, Quantization, and Entropy Encoding during the compre-ssion stage and carries out all inverse operations during the decompression phase. The AT76C101 uses an exter-nal SRAM as working memory, which is accessed by an onchip video interface.

The AT76C101 is designed to operate with minimum host intervention. A host processor is required to program the chip in the required operating mode, and to extract the JPEG header from the compressed bit stream during the decompression phase. Based on this information, it then initializes the internal registers. Once the chip has been initialized, the AT76C101 operates continuously until it has completed compression/decompression of a image frame.

About AT76C101,The image compression ratio is controlled by the user supplied quantization tables, which are loaded before the compression/decompression operation. Compression ratios from 1:1 to 50:1 are possible depending on the quality and storage requirements of the application.