MCM20027IBMN View Datasheet(PDF) - Motorola => Freescale

Part Name

Description

Manufacturer

MCM20027IBMN

Color SXGA Digital Image Sensor 1280 x 1024 pixel progressive scan solid state image sensor with integrated CDS/PGA/ADC, digital programming, control, timing, and pixel correction features

Motorola => Freescale 

MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

ImageMOS

7.5 Global Digital Offset Voltage Adjust (DOVA)

A programmable global offset adjustment is available

on the MCM20027. A user defined offset value is loaded

via a 6-bit signed magnitude programming code via the

Global DOVA Register, (Table 30), on page 47.

Offset correction allows fine-tuning of the signal to re-

move any additional residual error which may have ac-

cumulated in the analog signal path. This function is

performed directly before analog to digital conversion

and introduces a fixed gain of 2.0X. This feature is use-

ful in applications that need to insert a desired offset to

adjust for a known system noise floor relative to AVSS

and offsets of amplifiers in the analog chain.

7.6 Analog to Digital Converter (ADC)

The ADC is a fully differential, low power circuit. A pipe-

lined, Redundant Signed Digit (RSD) algorithmic tech-

nique is used to yield an ADC with superior

characteristics for imaging applications.

Integral Noise Linearity (INL) and Differential Noise Lin-

earity (DNL) performance is specified at +1.0 and +0.5,

respectively, with no missing codes. The input voltage

resolution is 2.44 mV with a full-scale 2.5 Vpp input (2.5

Vpp/210). The input dynamic range of the ADC is pro-

grammed via a Programmable Voltage Reference Gen-

erator. The positive reference voltage (VREFP) and

negative reference voltages (VREFM) can be pro-

grammed from 2.5V to 1.25V and 0V to 1.25V respec-

tively in steps of 5mV via the Reference Voltage

Registers (Table 19 and Table 20). This feature is used

independently or in conjunction with the DPGAs to max-

imize the system dynamic range based on incident illu-

mination. The default input range for the ADC is 1.9V for

VREFP and 0.6V for VREFM hence allowing a 10 bit

digitization of a 1.3V peak to peak signal.

Revision 8.4 - 24 Oct 2002 : MCM20027

MOTOROLA

19

Share Link: