TLC8044 Datasheet, PDF (17/32 Pages) Texas Instruments – 12-BIT ANALOG-TO-DIGITAL INTERFACE FOR CHARGE-COUPLED DEVICE IMAGE SENSORS FOR SCANNERS

Table 3. Mode Summary
MODE
DESCRIPTION
CDS
AVAILABLE
1 Color
Yes
MAX
SAMPLE
RATE
2 MSPS
SENSOR INTERFACE
DESCRIPTION
The three input channels
(R, G, B) are sampled in
parallel at 2 MSPS
maximum. The sampled
data is multiplexed into a
single data stream before
the internal ADC, giving an
internal serial data rate of
maximum 6 MSPS.
2 Monochrome
One input channel is
continuously sampled. The
Yes
2 MSPS internal multiplexer is held
in one position under
control of the user.
3
Fast
monochrome
Yes
4 MSPS Identical to mode 2
4
Max speed
monochrome
No
† _{Only indicates relevant register bits.}
6 MSPS Identical to mode 2
TIMING REQUIREMENTS
REGISTER CONTENTS
WITH CDS†
MCLK max: 12 Mhz
MCLK: VSMP ratio is 6:1
Setup register 1:
Word 1: 00h
Word 2: 81h
Identical to mode 1
MCLK max: 12 MHz
MCLK: VSMP ratio is 3:1
Setup register 1:
Word 1: 00h
Word 2: 91h
Setup register 2:
Word 2: bits b(1,0) define
which channel to be
sampled
Identical to mode 2 plus
Setup register 2:
Word 1: bits b(1,0) must be
set to 00h
MCLK max: 12 MHz
MCLK: VSMP ratio is 2:1
Not supported
REGISTER CONTENTS
WITHOUT CDS†
Setup register 1:
Word 1: 00h
Word 2: 80h
Setup register 1:
Word 1: 00h
Word 2: 90h
Setup register 2:
Word 2: bits b(1,0) define
which channel to be
sampled
Identical to mode 2
Setup register 1: 5Dh
Setup register 2:
Word 2: bits b(1,0) define
which channel to be
sampled