TLC8044 Datasheet, PDF (25/32 Pages) Texas Instruments – 12-BIT ANALOG-TO-DIGITAL INTERFACE FOR CHARGE-COUPLED DEVICE IMAGE SENSORS FOR SCANNERS

REGISTER
Setup
Register 1
Setup
Register 2
TLC8044
12-BIT ANALOG-TO-DIGITAL INTERFACE FOR
CHARGE-COUPLED DEVICE IMAGE SENSORS FOR SCANNERS
SLAS128 – JUNE 1997
PRINCIPLES OF OPERATION
BITS
ENADC
BICLIP
ADCMX
MONO
DEFPG
DEFPO
DNS
INVADC
CDS
POSCL1, 0
WLSEL1, 0
THSEL1, 0
CDSREF1, 0
CHAN1, 0
Table 6. Control Bit Descriptions
DEFAULT
DESCRIPTION
ADC standby control:
1
0 = standby
1 = active
Bipolar clip enable:
0
0 = unipolar clip
1 = bipolar clip
ADC MUX control:
0
0 = normal operation
1 = ADC output multiplexed to OP
Mono/color select:
0
0 = color operation
1 = monochrome operation
Select default pixel gain:
0
0 = external pixel gain
1 = default (internal)
Select default pixel offsets:
0
0 = external pixel offsets
1 = default (internal)
Select differential/single-ended mode:
0
0 = single ended
1 = differential
ADC output polarity:
0
0 = noninverted
1 = inverted
Select correlated double sampling mode:
0
0 = normal sampling
1 = CDS mode
Pixel offset scaling:
00 = ±0.5 fs
00
01 = ±0.25 fs
10 = ±0.125 fs
11 = ±0.0625 fs
Output word length select:
00 = 8 bits (OP0 - OP7 contains output word)
10
01 = 10 bits (OP0 - OP9 contains output word)
10 = 12 bits (OP0 - OP11 contains output word)
11 = 16 bits (OP0 - OP15 contains output word)
Threshold detector operating mode:
00 = Operating on red channel only
11
01 = Operating on green channel only
10 = Operating on blue channel only
11 = Three channel
CDS mode reset timing adjust:
00 = Advance 1 MCLK period
01
01 = Normal
10 = Retard 1 MCLK period
11 = Retard 2 MCLK periods
Monochrome mode channel select:
00 = Red channel
00
01 = Green channel
10 = Blue channel
11 = Not used
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