Electronic Components Datasheet Search |
|
TC221-30 Datasheet(PDF) 4 Page - Texas Instruments |
|
TC221-30 Datasheet(HTML) 4 Page - Texas Instruments |
4 / 14 page TC221, TC225, TC227 SMALL-FORMAT CCD IMAGE SENSORS SOCS037C – DECEMBER 1991 – REVISED AUGUST 1997 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 detailed description The TC221, TC225, and TC227 consist of four basic functional blocks: (1) the image-sensing area, (2) the serial registers, (3) the sensor node, and (4) the low-noise source-follower amplifier. The location of each of these blocks is identified in the functional block diagrams. image-sensing area As light enters the silicon in the image-sensing area, free electrons are generated and collected in the potential wells of the sensing elements. During this time, blooming protection is activated by applying a burst of pulses to the antiblooming gate. This prevents blooming by the spilling of charge from overexposed elements into neighboring elements. After integration and under dark conditions, the charge is transferred line by line into the serial register(s). The required timing is shown in Figure 1 through Figure 3. During transfer, the antiblooming gate is held at a low level. Each imager contains a specified number of dark pixels on the left side of the image-sensing area. These elements provide the dark reference used in subsequent video-processing circuits to restore the video black-level. serial register(s) Once an image line is transferred into the serial register, the serial-register gate can be clocked until all of the charge packets are moved out onto the sense node. A drain is also included to provide the capability to clear the image-sensing area of unwanted charge. Such charge can accumulate in the imager during the start-up of operation or under special conditions when nonstandard TV operation is desired. sense node(s) and source-follower amplifier(s) After the charge packet is placed on the sense node, the potential of this node changes in proportion to the amount of signal received. It is then buffered by a dual-stage source-follower amplifier. The sense node and amplifier are located some distance from the serial register; a specified number of dummy elements is used to span the distance. The location and number of the dummy elements are shown in the functional block diagrams. Terminal Functions TERMINAL NAME NUMBER I/O DESCRIPTION NAME TC221 TC225 TC227 ABG 2 4 5 I Antiblooming gate ADB 4 7 3 Amplifier-drain bias IAG 3 5 4 I Image-area gate NC N/A 6 N/A No internal connection OUT1 5 9 2 O Output signal 1 OUT2 N/A 8 N/A O Output signal 2 SRG1 1 2 6 I Serial-register gate 1 SRG2 N/A 3 N/A I Serial-register gate 2 SUB 6 10 1 Substrate TRG N/A 1 N/A I Transfer gate N/A – not applicable |
Similar Part No. - TC221-30 |
|
Similar Description - TC221-30 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |