PI0128WSN, PI0256WSN, PI0512WSN

50-mm-Pitch Wide Aperture Spectroscopic Photodiode Arrays

Engineering Data Sheet

Page 1 of 8

Revised March 21, 2002

Description

Peripheral Imaging Corporation's WSN series is family

of self-scanning photodiode solid-state linear imaging

arrays.

These photodiode sensors employ PIC’s

proprietary CMOS Image Sensing Technology to

integrate the sensors into a single monolithic chip.

These sensors are optimally designed for applications

in spectroscopy. Accordingly, these sensors contain a

linear array of photodiodes with an optimized geomet-

rical aspect ratio (50-mm aperture pitch x 2500-mm

aperture width) for helping to maintain mechanical

stability in spectroscopic instruments and for providing

a large light-capturing ability. The family of sensors

consists of photodiode arrays of various lengths, 128,

256, and 512 pixels.

The WSN photodiode arrays are mounted in 22-pin

ceramic side-brazed dual-in-line packages that fit in

standard DIP sockets. A diagram of its pinout configu-

ration is seen in Figure 1.

Features

·

65-pC saturation capacity for wide dynamic range.

·

Wide spectral response (180 – 1000 nm) for UV

and IR response.

·

NP junction photodiodes with superior resistance

to UV damage.

·

Low dark current.

·

Integration time up to 9 seconds at room tempera-

ture.

·

Integration time extended to hours by cooling.

·

High linearity.

·

Low power dissipation (less than 1 mW).

·

Geometrical structure for enhanced stability and

registration.

·

Standard 22-lead dual-in-line IC package.

Figure 1. Pinout configuration.

Sensor Characteristics

The Peripheral Imaging Corporation's self-scanned

WSN photodiodes are spaced on a 50-mm pitch. The

line density is 20 diodes/mm and accordingly the

overall die lengths of the different arrays vary with the

number of photodiodes. For example, the 128-pixel

array is 6.4-mm long, the 256-pixel array is 12.8-mm

long, and the 512-pixel array is 25.6-mm long. Each

array has four additional dummy photodiodes. On each

side, there are one dark (non-imaging) dummy photo-

diode and one imaging dummy photodiode. The height

of the sensors is 2500 mm. The tall, narrow apertures

make these sensors desirable for use in monochro-

mators and spectrographs.

Peripheral

Imaging

Corporation

™