AD9948 Analog Devices, AD9948 Datasheet - Page 21

• Manufacturer Part Number: AD9948
• Description: 10-Bit CCD Signal Processor with Precision Timing Core
• Manufacturer: Analog Devices

The same Bayer pattern can also be interlaced, and the interlaced
mode should be used with this type of CCD (see Figure 17b).
The color steering performs the proper multiplexing of the R,
G, and B gain values (loaded into the PxGA gain registers), and
is synchronized by the user with vertical (VD) and horizontal
(HD) sync pulses. For timing information, see Figure 18b.
Figure 17b. CCD Color Filter Example—Interlaced Readout
REV. 0
Figure 17a. CCD Color Filter Example—Progressive Scan
CCD: INTERLACED BAYER
EVEN FIELD
ODD FIELD
CCD: PROGRESSIVE BAYER
Gb
Gb
Gb
Gb
Gb
Gb
R
R
R
R
R
R
Gr
Gr
Gr
Gr
Gr
Gr
B
B
B
B
B
B
Gb
Gb
Gb
Gb
Gb
Gb
R
R
R
R
R
R
Gr
Gr
Gr
Gr
Gr
Gr
B
B
B
B
B
B
LINE0
LINE1
LINE2
LINE0
LINE1
LINE2
LINE0
LINE1
LINE2
COLOR STEERING MODE:
INTERLACED
COLOR STEERING MODE:
PROGRESSIVE
GAIN0, GAIN1, GAIN0, GAIN1, ...
GAIN0, GAIN1, GAIN0, GAIN1, ...
GAIN0, GAIN1, GAIN0, GAIN1, ...
GAIN2, GAIN3, GAIN2, GAIN3, ...
GAIN2, GAIN3, GAIN2, GAIN3, ...
GAIN2, GAIN3, GAIN2, GAIN3, ...
GAIN0, GAIN1, GAIN0, GAIN1, ...
GAIN2, GAIN3, GAIN2, GAIN3, ...
GAIN0, GAIN1, GAIN0, GAIN1, ...
–21–
A third type of readout uses the Bayer pattern divided into three
different readout fields. The three-field mode should be used
with this type of CCD (see Figure 17c). The color steering
performs the proper multiplexing of the R, G, and B gain values
(loaded into the PxGA gain registers), and is synchronized by
the user with vertical (VD) and horizontal (HD) sync pulses.
For timing information, see Figure 18c.
Figure 17c. CCD Color Filter Example—Three-Field Readout
CCD: 3-FIELD READOUT
FIRST FIELD
SECOND FIELD
THIRD FIELD
Gb
Gb
Gb
Gb
Gb
Gb
R
R
R
R
R
R
Gr
Gr
Gr
Gr
Gr
Gr
B
B
B
B
B
B
Gb
Gb
Gb
Gb
Gb
Gb
R
R
R
R
R
R
Gr
Gr
Gr
Gr
Gr
Gr
B
B
B
B
B
B
LINE0
LINE1
LINE2
LINE0
LINE1
LINE2
LINE0
LINE1
LINE2
COLOR STEERING MODE:
THREE FIELD
GAIN0, GAIN1, GAIN0, GAIN1, ...
GAIN2, GAIN3, GAIN2, GAIN3, ...
GAIN0, GAIN1, GAIN0, GAIN1, ...
GAIN2, GAIN3, GAIN2, GAIN3, ...
GAIN0, GAIN1, GAIN0, GAIN1, ...
GAIN2, GAIN3, GAIN2, GAIN3, ...
GAIN0, GAIN1, GAIN0, GAIN1, ...
GAIN2, GAIN3, GAIN2, GAIN3, ...
GAIN0, GAIN1, GAIN0, GAIN1, ...
AD9948