AR0331 datasheet(3/52 Pages) ONSEMI

3 / 52 page

AR0331

www.onsemi.com

FUNCTIONAL OVERVIEW

The AR0331 is a progressive-scan sensor that generates

a stream of pixel data at a constant frame rate. It uses an

on-chip, phase-locked loop (PLL) that can be optionally

enabled to generate all internal clocks from a single master

input clock running between 6 and 48 MHz. The maximum

output pixel rate is 148.5 Mp/s, corresponding to a clock rate

of 74.25 MHz. Figure 1 shows a block diagram of the sensor.

Figure 1. Block Diagram

Row noise correction

Black level correction

Adaptive CD filter

Motion correction and

Blue Halo filter

HDR linearization

(ME or DLO)

Pixel defect correction

Smooting filter

Digital gain and

pedestal

Companding

16, 14, or 12 bits

Parallel

HiSPi

12 bits

( HDR and Linear),

12 or 10 bits Linear

Test pattern generator

ADC data

User interaction with the sensor is through the two-wire

serial bus, which communicates with the array control,

analog signal chain, and digital signal chain. The core of the

sensor is a 3.1 Mp Active-pixel Sensor array. The timing and

control circuitry sequences through the rows of the array,

resetting and then reading each row in turn. In the time

interval between resetting a row and reading that row, the

pixels in the row integrate incident light. The exposure is

controlled by varying the time interval between reset and

readout. Once a row has been read, the data from the

columns is sequenced through an analog signal chain

(providing offset correction and gain), and then through an

analog-to-digital converter (ADC). The output from the

ADC is a 12-bit value for each pixel in the array. The ADC

output passes through a digital processing signal chain

(which provides further data path corrections and applies

digital gain). The sensor also offers a high dynamic range

mode of operation where multiple images are combined

on-chip to produce a single image at 16-bit per pixel value.

A compression mode is further offered to allow the 16-bit

pixel value to be transmitted to the host system as a 12-bit

value with close to zero loss in image quality.

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