TC244A

786-

× 488-PIXEL CCD IMAGE SENSOR

SOCS056 – JUNE 1996

2

POST OFFICE BOX 655303

description (continued)

A gated floating-diffusion detection structure with an automatic reset and voltage reference incorporated on-chip

converts charge to signal voltage. The signal is further processed by a low-noise, state-of-the-art

correlated-clamp sample-and-hold circuit. A low-noise, two-stage, source-follower amplifier buffers the output

and provides high output-drive capability.

The TC244A is built using TI-proprietary virtual-phase technology, which provides devices with high blue

response, low dark current, high photoresponse uniformity, and single-phase clocking.

The TC244A is characterized for operation from –10

°C to 45°C.

functional block diagram

Dark-Reference Elements

Clearing Drain

Amplifiers

OUT2 (G)

OUT3 (B)

ADB

ABG

IAG

2

3

4

5

6

7

OUT1 (R)

8

AMP GND

CDB

9

SRG3

SRG2

SRG1

TRG

IDB

12

14

15

16

SAG

17

ABG

IAG

18

19

Storage Area

Blooming Protection

Image Area With

Top Drain

11 Dummy

Elements

Gates, and Serial Registers

Multiplexer, Transfer

11

detailed description

The TC244A consists of four basic functional blocks: (1) the image-sensing area, (2) the image-storage area,

(3) the multiplexer block with serial registers and transfer gates, and (4) the low-noise signal-processing

amplifier block with charge-detection nodes. The location of each block is identified in the functional block

diagram.