Digital CCD Camera Head Amplifier
Description
The CXA2006Q is a bipolar IC developed as a
head amplifier for digital CCD cameras. This IC
provides the following functions: correlated double
sampling, AGC for the CCD signal, GCA for the low-
band chroma signal, AMP for high-band chroma and
line signals, A/D sample and hold, blanking, A/D
reference voltage, and an output driver.
Features
High sensitivity made possible by a high-gain AGC
amplifier
Blanking function provided for the purpose of
calibrating the CCD output signal black level
Regulator output pin provided for A/D converter
reference voltage
Built-in GCA and AMP for amplifying video signals
(chroma and line signals) from external sources
Built-in sample-and-hold circuits (for camera signals
and for video signals) required by external A/D
converters
Absolute Maximum Ratings
Supply voltage
V
CC
14
V
Operating temperature Topr
20 to +75
C
Storage temperature
Tstg
65 to +150
C
Allowable power dissipation
P
D
640
mW
Operating Conditions
Supply voltage
V
CC
1, 2, 3
4.5 to 5
V
Applications
Digital CCD cameras
Structure
Bipolar silicon monolithic IC
1
E94X41B8X-PS
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any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the
operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
CXA2006Q
32 pin QFP (Plastic)
3
CXA2006Q
Pin Description
(V
CC
1, 2, 3 = 4.75V)
Pin
No.
Symbol
Pin voltage
Equivalent circuit
Description
1
CAM
/VIDEO
Camera and video
signal selector.
2
PB/REC
Chroma signal and
composite video
signal selector.
3
CH/CL
High-band chroma
signal and low-band
chroma signal selector.
4
PS
Power save mode.
5
VSHP
Sample-and-hold
pulse input for video.
6
23
30
GND3
GND23
GND2
Ground.
7
LOUTCLP
Capacitor connection
for LOUTCLP which
clamps the output
minimum level in
modes which pass
the composite video
signal.
(Recommended
value: 0.1F)
VTH = 1.35V
Sampling
VTH = 1.32V
GND
Approx. 2V
1.35V
127
10k
24k
27k
25A
25A
68k
2
3
4
1
127
10k
6.25k
2mA
16.25k
1.32V
400A
5
127
24k
66k
200A
100k
1.1k
100A
1.27V
16k
4A
7
Sampling
4
CXA2006Q
8
DRVOUT
Driver output for A/D
converter capable of
DC coupling.
Dynamic range
= 2Vp-p
Camera mode
(CAM)
VRB 200mV
< black level
< VRB + 300mV
Composite
video mode
(LIN)
VRB + 100mV
Chroma mode
(CH, CL)
Center voltage =
(VRT VRB)/2
10
VRB
2V regulator output.
Be sure to decouple
this pin near the IC
pins to prevent the
oscillation and external
noise when this pin is
not used.
(Recommended
capacitor value: 4.7F)
9
20
27
V
CC
3
V
CC
1
V
CC
2
Power supply.
V
CC
2.0V
4.0V
11
VRT
4V regulator output.
Be sure to decouple
this pin near the IC
pins to prevent the
oscillation and external
noise when this pin is
not used.
(Recommended
capacitor value: 4.7F)
100A
50
30k
127
4mA
1.5mA
1.5mA
DRVOUT
10p
OFFSET
2.1V
SW2
SW1
8
SW1 SW2
Mode
0
0
1
1
0
1
0
1
CH, CL
CAM
LIN
--
0: Closed
1: Open
2V
10k
100A
13.75k
2k
10
4V
20k
100A
3.75k
3k
100A
1.1k
100A
11
Pin
No.
Symbol
Pin voltage
Equivalent circuit
Description
5
CXA2006Q
12
OFFSET
Controls the output
offset during camera
mode.
When 0V:
less than
(VRB 200mV)
When 3.0V:
greater than
(VRB + 300mV)
0 to 3V
24k
100A
66k
23k
1.1k
100A
127
10k
12
13
PBLK
Camera signal pre-
blanking pulse input.
Active when Low only
during camera mode.
Calibrates the black
level of the AGC
output waveform.
When PBLK is Low,
the DRVOUT
potential is forced to
2V.
VTH = 1.35V
27k
25A
68k
24k
25A
127
10k
1.35V
13
14
XRS
Camera signal
sample-and-hold
pulse input.
VTH = 2.16V
10.25k
12.25k
200
100A
127
10k
200
2.5mA
2.16V
5p
14
15
CLPOB
Clamp pulse used to
clamp the optical
black portion of the
camera signal after it
passes through the
AGC amplifier.
VTH = 1.45V
29k
1.1k
127
10k
100A
1.45V
66k
15
Active: Low
Sampling
Active: Low
Pin
No.
Symbol
Pin voltage
Equivalent circuit
Description
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