TC244A Datasheet, PDF (2/19 Pages) Texas Instruments – 786- × 488-PIXEL CCD IMAGE SENSOR

TC244A
786- × 488-PIXEL CCD IMAGE SENSOR
SOCS056 – JUNE 1996
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
Top Drain
2
IAG
3
ABG
4
ADB
Amplifiers
Image Area With
Blooming Protection
Dark-Reference Elements
Storage Area
19
IAG
18
ABG
17
SAG
5
OUT3 (B)
6
OUT2 (G)
7
OUT1 (R)
Multiplexer, Transfer
Gates, and Serial Registers
IDB
11
16
SRG3
15
SRG2
14
SRG1
12
TRG
11 Dummy
Elements
8
AMP GND
9
CDB
Clearing Drain
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.
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