Samsung Inkjet SCX-1150F, Руководство по ремонту

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CIRCUIT DESCRIPTION
Samsung Electronics
Repair Manual
3-6-2 ADC
Description ADC(U16) is the input data that change the
analog signal of RGB to the digital signal of 16bit (8bit +
8bit) so that it may be used as the input of OA-980(U21),
image processor, while VSMP(_ADC_VSMP) is used as a
sampling signal for each pixel of RGB. That is, it controls
the signal for one pixel like CLK1,CLK2 of CCD and its
maximum sampling rate is of color 2MHz mono 4MHz.
MCLK(ADC_CLK) is CLK for the signal of VSMP, the rela-
tion between MCLK and VSMP is as follows.
The relations among SCK(ADC_SCK), SDI(ADC_SDI) and
SEN(ADC_SEN) are equivalent to the control bit for regis-
ter setting to mode, output signal appears in 8bit unit from
OP0 to OP7, and 5V/3.3V will be used as the power source.
Color Mono
VSMP 800ns(1.25MHz) 400ns(2.5MHz)
ADC_CLK 133ns(7.5MHz) 133ns(7.5MHz)
VSMP:MCLK 1:6 1:3
R
A
R
B
G
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R
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B
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G
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B
16.5 MCLK PERIODS
ADC_CLK
VSMP
OP[7:0]
(DEL = 00)
OP[7:0]
(DEL = 01)
OP[7:0]
(DEL = 10)
OP[7:0]
(DEL = 11)
R
A
R
B
G
A
G
B
B
A
B
B
R
A
R
B
G
A
G
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B
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16.5 MCLK PERIODS
ADC_CLK
VSMP
OP[7:0]
(DEL = 00)
OP[7:0]
(DEL = 01)
OP[7:0]
(DEL = 10)
OP[7:0]
(DEL = 11)
<Figure 20. Color mode MCLK, VSMP>
<Figure 20-1. Color mode MCLK, VSMP>