AR0237CS datasheet(6/38 Pages) ONSEMI

6 / 38 page

AR0237CS/D Rev. 4, 6/16 EN

©Semiconductor Components Industries, LLC, 2016.

AR0237CS: 1/2.7-Inch 2.1 Mp/Full HD Digital Image Sensor

Functional Overview

The AR0237 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 configured in linear

mode, and in HDR mode.

Figure 1:

Block Diagram of AR0237

User interaction with the sensor is through the two-wire serial bus, which communi-

cates with the array control, analog signal chain, and digital signal chain. The core of the

sensor is a 2.1 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

Row Noise Correction

Black Level Correction

Test Pattern Generator

Pixel Defect Correction

Digital Gain and Pedestal

A-Law Compression

Parallel

HiSPi

12 bits

10 bits

ADC Data

AR0237CS Datasheet(PDF) 6 Page - ON Semiconductor