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Part: TLC8044CFN
Category:
Data Conversion
-> ADC (Analog to Digital Converters)
Description: ti TLC8044, ADC if For Charge-coupled Device Image Sensors For Scanners
Company: Texas Instruments, Inc.
Datasheet: Download TLC8044CFN datasheet File size : 548 kB
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Datasheet text preview:
TLC8044 12-BIT ANALOG-TO-DIGITAL INTERFACE FOR CHARGE-COUPLED DEVICE IMAGE SENSORS FOR SCANNERS
SLAS128 JUNE 1997
D D D D D D D D D
Color or Gray Scale Operation Signals Processed in the Digital Domain Differential RGB Input Multiplexer Three 8-bit DACs for CCD Offset Level Shifting With Bipolar Correction Range Two Sampling Modes: DAC Referenced Correlated Double Sampling (CDS) 12-Bit ADC with 6 MSPS Operation Digital dc Restoration Pixel-By-Pixel Offset and Shading (Gain) Compensation Global Gain Adjust for Each Color (Channel)
D D D D D D D D
Compatible with 600 dpi CCD Image Sensors Global Offset Adjust for Each Color (Channel) Output Word Length Programmable to 8, 10, 12, or 16 Bits Programmable Threshold Detector for Each Color (Channel) Dual Internal Default Registers for Even/Odd Pixel Offset Correction 68-Terminal PLCC Package
applications
Handy Scanners Flatbed Scanners
description
The TLC8044 is a 12-bit analog-to-digital interface subsystem for charge-coupled device (CCD) image sensors and scanners. An input multiplexer allows color operation with a single on-chip 12-bit ADC. The TLC8044 uses DSP circuits to correct for nonideal CCD image sensor and scanning system characteristics. Cost effective gray scale operation is obtained using a single multiplexer input. The TLC8044 three-channel input multiplexer and sampling function has two basic modes of operation: normal sampling and correlated double sampling. The internal sample and hold allows all three channels to be sampled simultaneously in color operation. Three DACs (8 bits + sign) are provided to allow bipolar adjustment of the dc level of the signal at the ADC input. Digital dc restoration is provided following the ADC. Variations in offset and luminance across a scan are dynamically corrected on a pixel-by-pixel basis, using calibration data provided by an external data store. Provisions are made for global adjustments of gain, contrast and color balance, and offset for brightness. The output word length can be programmed to 8, 10, 12, or 16 bits, and a programmable threshold detector is provided for use during calibration and OCR applications. The TLC8044 is characterized for operation from 0°C to 70°C.
AVAILABLE OPTIONS PACKAGE TA 0°C to 70°C CHIP CARRIER (FN) TLC8044FN
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright © 1997, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
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TLC8044 12-BIT ANALOG-TO-DIGITAL INTERFACE FOR CHARGE-COUPLED DEVICE IMAGE SENSORS FOR SCANNERS
SLAS128 JUNE 1997
FN PACKAGE (TOP VIEW)
CC1 CC0 ORNG DETOP DGND PSC11 PSC10 PSC9 PSC8 PSC7 PSC6 PSC5 PSC4 PSC3 PSC2 PSC1 PSC0
9 8 7 6 5 4 3 2 1 68 67 66 65 64 63 62 61 60 10 59 11 58 12 57 13 56 14 55 15 54 16 53 17 52 18 51 19 50 20 49 21 48 22 47 23 46 24 45 25 44 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43
OP0 OP1 OP2 OP3 OP4 OP5 OP6 OP7 DVDD2 OP8 OP9 OP10 OP11 OP12 OP13 OP14 OP15 DVDD1 ONE SDI SCK SEN MCLK VSMP OE RINP RINN GINP GINN AVDD AGND BINP BINN DAC
2
POC11 POC10 POC9 POC8 POC7 POC6 POC5 POC4 POC3 POC2 POC1 POC0 RESET RT RB RU RL
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
functional block diagram
RB RL DAC ONE POC PSC
RU
RT
12
12
MCLK REF 3 12- Bit ADC DC Restore MUX 2:1 MUX 12 16 16 12 16 Pixel Offset Adjust Global Offset Adjust Global Gain Adjust Pixel Shading MUX Adjust 16 16 16
VSMP
Timing Control
CC
OE 16 OP ORNG Output Word Length Select
CDS
RINP RINN Video Sample/MUX
GINP GINN
BINP BINN 3:1 MUX Reg R Reg G Reg B Reg Be Reg Bo Reg B Reg B Reg Ge Reg Go Reg G Reg G Reg Re Reg Ro Reg R Reg R Reg R Reg G Reg B 3:1 MUX 3:1 MUX 3:1 MUX 3:1 MUX 3:1 MUX
+ + + + + +
Threshold Detect
DETOP
8-Bit + Sign DACB
8-Bit + Sign DACG
SDI Serial Interface SCK SEN
TLC8044 12-BIT ANALOG-TO-DIGITAL INTERFACE FOR CHARGE-COUPLED DEVICE IMAGE SENSORS FOR SCANNERS
POST OFFICE BOX 655303 · DALLAS, TEXAS 75265
8-Bit + Sign DACR
SLAS128 JUNE 1997
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