iC-LA

64X1 LINEAR IMAGE SENSOR

Rev A3, Page 2/8

DESCRIPTION

iC-LA is an integrating light-to-voltage converter with a row of 64 separate pixels. Each pixel consists of one

photodiode, an integration capacitor and a track-and-hold circuit. For each pixel the photocurrent of the

photodiode charges the integration capacitor. The track-and-hold circuit reads out the capacitor voltage in

track mode; when the circuit switches into hold mode this voltage is present for one clock cycle at output

AOUT.

Photocurrent integration is started simultaneously for all pixels with the rising edge of the clock signal if DIN

has received a high signal. Following hold mode, the pixels are subsequently selected by their output

switches. The downstream multiplexer selects the odd or even bus line for the output buffer. This dual line

configuration means that a high working speed is obtained.

The switches are controlled by the shift register whereas the multiplexer is operated by the control logic. The

DNU input signal determines the direction of shift. If DNU is low, the pixel signals are switched in ascending

order to AOUT, starting at pixel 0. If DNU is high, the pixels are switched in descending order, starting at pixel

63.

If input DIN is still high at the end of a completed integration cycle, all integration capacitors are automatically

reset and a new integration cycle is initiated. Continuous operation of the iC is thus possible.

All registers are reset with low voltage at the digital supply (power-down reset). All pins are protected against

damage by ESD.