TEXAS INSTRUMENTS Semiconductors

Texas Instruments Announces New 400 DPI Image Sensor

DALLAS (August 23, 1996) -- A linear image sensor with 400 dots per inch (DPI) of pixel pitch and a new hold function to minimize image skewing is now available from Texas Instruments (TI). This latest addition to TI's CMOS linear sensor array family provides designers with added control over pixel integration and is a cost-effective solution for numerous scanning and sensing applications such as image scanning, contact imaging and code reading.

This device, the TSL1401, consists of 128 photodiodes arranged in a linear array, associated charge amplifier circuitry, and a pixel data-hold function that causes all pixels to start and stop integration at the same time, rather than sequentially as each pixel is clocked out. This helps eliminate image skewing, which can be a problem with conventional linear arrays. In many applications, particularly when the target is moving at a high speed, it is necessary to have fine control over the exposure period. The TSL1401 can achieve this control through an electronic shutter feature that is activated by clocking in the serial input (SI) pulse, then stopping or gating the clock. Integration is then stopped, and the pixels can be clocked out at a later time. This feature further emphasizes the versatility and cost effectiveness of the TSL1401.

Features/Benefits

400 DPI 128 x 1 pixel format

 Greatens image resolution

High linearity and uniformity
for 256 grey scale applications

 Achieves 8 bit output resolution

Single-clock and supply voltage

 Lowers system cost

Low image lag -- 0.5%

 Improves image quality

2 MHz clock

 Increases system output

End Equipment Applications

Applications for the TSL1401 linear photodiode array include:

Pricing, Packaging and Availability

The TSL1401 is now available through TI and its authorized distributors. It is in an 8 pin clear-plastic Dual In-line Package (DIP). The suggested retail price is $4.95 in quantities of 1,000.

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