Datasheet
Table Of Contents
- FEATURES
- APPLICATIONS
- GENERAL DESCRIPTION
- FUNCTIONAL BLOCK DIAGRAM
- TABLE OF CONTENTS
- REVISION HISTORY
- SPECIFICATIONS
- ABSOLUTE MAXIMUM RATINGS
- PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
- TERMINOLOGY
- EQUIVALENT INPUT/OUTPUT CIRCUITS
- TYPICAL PERFORMANCE CHARACTERISTICS
- SYSTEM OVERVIEW
- SERIAL INTERFACE TIMING
- COMPLETE REGISTER LISTING
- PRECISION TIMING HIGH SPEED TIMING GENERATION
- HORIZONTAL CLAMPING AND BLANKING
- GENERATING SPECIAL HBLK PATTERNS
- POWER-UP PROCEDURE
- ANALOG FRONT END DESCRIPTION AND OPERATION
- APPLICATIONS INFORMATION
- OUTLINE DIMENSIONS
AD9949
Rev. B | Page 27 of 36
COLOR
STEERING
CONTROL
4:1
MUX
GAIN0
GAIN1
GAIN2
GAIN3
PxGA
PxGA STEERING
MODE
SELECTION
VD
HD
PxGA GAIN
REGISTERS
CONTROL
REGISTER
BITS D0 TO D1
SHP/SHD
VGACDS
03751-030
8
4:1
MUX
2
3
Figure 29. PxGA Block Diagram
LINE0 GAIN0, GAIN1, GAIN0, GAIN1, ...
R
R
Gr
Gr
LINE1
LINE2
GAIN2, GAIN3, GAIN2, GAIN3, ...
GAIN0, GAIN1, GAIN0, GAIN1, ...
COLOR STEERING MODE:
PROGRESSIVE
R
RGrGr
Gb
B
CCD: PROGRESSIVE BAYER
Gb B
Gb
B
Gb B
03751-031
Figure 30. CCD Color Filter Example—Progressive Scan
The same Bayer pattern can also be interlaced, and the
interlaced mode should be used with this type of CCD (see
Figure 31). 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 34.
LINE0 GAIN0, GAIN1, GAIN0, GAIN1, ...
RRGrGr
LINE1
LINE2
GAIN0, GAIN1, GAIN0, GAIN1, ...
GAIN0, GAIN1, GAIN0, GAIN1, ...
Gb GbBB
LINE0 GAIN2, GAIN3, GAIN2, GAIN3, ...
LINE1
LINE2
GAIN2, GAIN3, GAIN2, GAIN3, ...
GAIN2, GAIN3, GAIN2, GAIN3, ...
COLOR STEERING MODE:
INTERLACED
Gb GbBB
Gb GbBB
Gb GbBB
RRGrGr
RRGrGr
RRGrGr
EVEN FIELD
ODD FIELD
CCD: INTERLACED BAYER
03751-032
Figure 31. CCD Color Filter Example—Interlaced Readout
A third type of readout uses the Bayer pattern divided into three
different readout fields. The 3-field mode should be used with
this type of CCD (see Figure 32). 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 35.
LINE0 GAIN0, GAIN1, GAIN0, GAIN1, ...
RGr
LINE1
LINE2
GAIN2, GAIN3, GAIN2, GAIN3, ...
GAIN0, GAIN1, GAIN0, GAIN1, ...
LINE0 GAIN2, GAIN3, GAIN2, GAIN3, ...
LINE1
LINE2
GAIN0, GAIN1, GAIN0, GAIN1, ...
GAIN2, GAIN3, GAIN2, GAIN3, ...
COLOR STEERING MODE:
THREE FIELD
GbB
GbB
RGr
FIRST FIELD
SECOND FIELD
CCD: 3-FIELD READOUT
LINE0 GAIN0, GAIN1, GAIN0, GAIN1, ...
RGr
LINE1
LINE2
GAIN2, GAIN3, GAIN2, GAIN3, ...
GAIN0, GAIN1, GAIN0, GAIN1, ...
RGr
THIRD FIELD
GbB
GbB
RGr
RGr
GbB
R
Gb
Gb
R
R
R
Gb
Gb
R
R
Gb
Gb GbB
Gr
B
B
Gr
Gr
Gr
B
B
Gr
Gr
B
B
03751-033
Figure 32. CCD Color Filter Example—Three-Field Readout