MLX90255BA datasheet(4/10 Pages) ETC

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Datasheet

MLX90255BA

Linear Optical Array

MLX90255BA Linear Optical Array

Page 4

Rev 1.2 08-Aug-01

3901090255

General Description

(continued from page 1)

As the SI pulse is clocked through the shift

capacitors is sequentially connected to a charge-

coupled output amplifier that generates a voltage

on the analog output AO. Two dummy pixel

values are shifted out first, then the 128 actual

pixel bits, followed by two additional dummy

pixel bits, for a total of 132 data bits. Although

there are only 132 pixels, 133 clock pulses are

necessary for a complete shift out. The final

pulse is used to re-initialize the shift register.

The integrator reset period ends 18 clock cycles

after the SI pulse is clocked in. So the light-

integration starts after the 18

th CLK pulse. The

light-integration ends at the next SI pulse.

Between the end of the 133

th clock pulse and the

next SI pulse, a minimum time of 10µs is

necessary for an effective S&H function. So the

minimum integration time of the MLX90255BA is

(133 -18) * Ts + 10µs and thus dependent on

clock speed. (Ts = clock period) After the 132

data bits are clocked out, the output becomes

high impedance. (see figure) The AO is driven

by a source follower that requires an external

pulldown resistor. (typically 33

0Ω) The output is

nominally 125mV for no light input and 2.4V for a

nominal full-scale output. The pixel gain is 15%

bigger at the edges than in the middle (cosine

correction) in order to get a flat output when

illuminating the device with a single LED light

source.

The MLX90255BA is intended for use in a wide

variety

applications,

including:

image

scanning, mark and code reading, optical

character

recognition

(OCR)

and

contact

imaging, edge detection and positioning, and

optical

linear

and

rotary

encoding.

The

MLX90255BA is a replacement for the Texas

Instruments' TSL1301 and TSL1401 parts.

Absolute Maximum Ratings

Supply Voltage, Vdd

+7V

Digital Input Current Range

-20 to 20 mA

Operating Free-Air temperature

range, Ta

-40°C to 125°C

(automotive compliant

optical package)

Storage temperature range,

Tstg

-40°C to 125°C

Lead Temperature

1.6mm (1/16 inch) from case for

10 seconds

260°C

Stresses beyond those listed under "absolute

maximum

ratings"

may

cause

permanent

damage to the device.

These are stress ratings only, and functional

operation of the device at these or any other

conditions

beyond

those

indicated

under

"recommended operating conditions" is not

implied.

Exposure

absolute-maximum

-rated

conditions for extended periods may affect

device reliability.

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