TC236

680-

× 500-PIXEL CCD IMAGE SENSOR

SOCS043A – JUNE 1994 – REVISED NOVEMBER 1994

Copyright

1

POST OFFICE BOX 655303

Image Sensor for NTSC Color Applications

Image-Sensing Area Compatible With

Electronic Centering

– Progressive Scan

– Interlaced Scan

– Dual-Line Readout

From 1/60 – 1/50,000 s

Antiblooming

Burn-In, Residual Imaging, Image

Distortion, Image Lag, or Microphonics

description

The TC236 is a frame-transfer, charge-coupled device (CCD) image sensor designed for use in single-chip color

NTSC TV, computer, and special-purpose applications requiring low cost and small size.

The image-sensing area of the TC236 is configured into 500 lines with 680 elements in each line. Twenty-two

elements are provided in each line for dark reference. The blooming-protection feature of the sensor is based

on an advanced lateral-overflow-drain concept. The sensor can be operated in a true-interlace mode as a

658(H)

× 496(V) sensor with a very low dark current. One important feature of the TC236 very high-resolution

sensor is the ability to capture a full 340,000 pixels per field. The image sensor also provides high-speed image-

transfer capability. This capability allows for a continuous electronic exposure control without the loss of

sensitivity and resolution inherent in other technologies. The charge is converted to signal voltage at 20

µV per

electron by a high-performance structure with a reset and a voltage-reference generator. The signal is further

buffered by a low-noise, two-stage, source-follower amplifier to provide high output-drive capability.

The TC236 is built using TI-proprietary advanced virtual-phase (AVP) technology, which provides devices with

high blue response, low dark signal, good uniformity, and single-phase clocking. The TC236 is characterized

for operation from – 10

°C to 45°C.

This MOS device contains limited built-in gate protection. During storage or handling, the device leads should be shorted together

or the device should be placed in conductive foam. In a circuit, unused inputs should always be connected to VSS. Under no

circumstances should pin voltages exceed absolute maximum ratings. Avoid shorting OUT to VSS during operation to prevent

damage to the amplifier. The device can also be damaged if the output terminals are reverse-biased and an excessive current is

allowed to flow. Specific guidelines for handling devices of this type are contained in the publication

Guidelines for Handling

Electrostatic-Discharge-Sensitive (ESDS) Devices and Assemblies available from Texas Instruments.

ADVANCE INFORMATION concerns new products in the sampling or

preproduction phase of development. Characteristic data and other

specifications are subject to change without notice.