ASX340AT datasheet(19/75 Pages) ONSEMI

19 / 75 page

ASX340AT/D Rev. H, 8/15 EN

©Semiconductor Components Industries, LLC, 2015.

ASX340CS: 1/4-Inch Color CMOS NTSC/PAL Digital Image Sensor

Sensor Pixel Array

Test Patterns

During normal operation of the ASX340AT, a stream of raw image data from the sensor

core is continuously fed into the color pipeline. For test purposes, this stream can be

replaced with a fixed image generated by a special test module in the pipeline. The

module provides a selection of test patterns sufficient for basic testing of the pipeline.

NTSC/PAL Test Pattern Generation

There is a built-in standard EIA (NTSC) and EBU (PAL) color bars to support hue and

color saturation characterization. Each pattern consists of seven color bars (white,

yellow, cyan, green, magenta, red, and blue). The Y, Cb and Cr values for each bar are

detailed in Tables 7 and 8.

Figure 10:

Color Bars

CCIR-656 Format

The color bar data is encoded in 656 data streams. The duration of the blanking and

active video periods of the generated 656 data are summarized in Tables 9 and 10.

Table 7:

EIA Color Bars (NTSC)

Nominal Range

White

Yellow

Cyan

Green

Magenta

Red

Blue

16 to 235

180

162

131

112

16 to 240

128

156

184

100

212

16 to 240

128

142

198

212

114

Table 8:

EBU Color Bars (PAL)

Nominal Range

White

Yellow

Cyan

Green

Magenta

Red

Blue

16 to 235

235

162

131

112

16 to 240

128

156

184

100

212

16 to 240

128

142

198

212

114

Table 9:

NTSC

Line Numbers

Field

Description

1-3

Blanking

4-19

Blanking

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