Sony CXA1690Q Datasheet
Head Amplifier for Digital CCD Cameras
Description
The CXA1690Q is a bipolar IC developed as a
head amplifier for digital CCD cameras. The
CXA1690Q provides the following functions:
correlated double sampling, AGC for CCD signals,
GCA for chroma signals, GCA for line signals,
sample and hold for A/D converters, blanking, and
reference voltage output/output driver for A/D
converters.
Features
• Permits higher sensitivity with a high-gain AGC
amplifier
• Blanking function for the purpose of calibrating the
deviation in black levels of the CCD output signals
• Permits output offset adjustment
• Provides a regulator output pin for the reference
voltage for A/D converters
• Built-in GCA that amplifies video signals (chroma
and line signals) from an external source
• Built-in sample-and-hold circuits (for both camera
signals and video signals) required by external A/D
converters
Absolute Maximum Ratings
• Supply voltage VCC 14 V
• Operating temperature Topr –20 to +75 °C
• Storage temperature Tstg –65 to +150 °C
• Allowable power dissipation PD 460 mW
Operating Conditions
Supply voltage VCC1, 2, 3 4.5 to 5 V
– 1 –
E93X02A8X-PS
Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by
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.
CXA1690Q
32 pin QFP (Plastic)
Structure
Bipolar silicon monolithic IC
Applications
Digital CCD cameras
– 2 –
CXA1690Q
Block Diagram and Pin Configuration
CLPSW
RFDC
LOUTCLP
CAMCLP
DRV
C/V
SW
VISH
VISW
LIN
AMP
LINCLP
RFGCA
REF
BOTTOM
REF
TOP
AGCCLP
LPF
CAMSH
BLK
AGC
CDSCLP2
CDSCLP1
SH3
SH2SH1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
1
AGCCLP
CLPOB
X
RS
PBLK
OFFSET
V
RT
VRB
VCC3
PIN
DIN
V
CC2
NC
LINE
GND2
RFCONT
PBRFC
CLPDM
GND1
SHD
SHP
V
CC1
CCDLEVEL
AGCCONT
AGCMAX
CAM/VIDEO
PB/REC
VSHI
CSHI
VSHP
GND3
DRVOUT
CLPDRV
– 3 –
CXA1690Q
Pin Description
(Vcc = 4.5V)
Pin
No.
Symbol Pin voltage Equivalent circuit Description
1
CAM
VIDEO
H: Vcc
L: GND
18
VTH =
50
Vcc
Switches between CAM
mode for the camera
signal system and PB
and LIN modes for the
video signal system.
2
PB REC
H: Vcc
L: GND
18
VTH =
50
Vcc
3
VSHI
1.4V
This pin adjusts the
slew rate when the
video sample-and-hold
circuit (VISH) built into
the CXA1690 is
sampling. Normally
used open.
R = 1K: approx. +6dB;
R = 5K: approx. –6dB
4
CSHI
1.4V
This pin adjusts the
slew rate when the
camera sample-andhold circuit (CAMSH)
built into the CXA1690
is sampling. Normally
used open.
R = 1K: approx. +6dB;
R = 5K: approx. –6dB
5 VSHP
Sampling
18
VTH =
50
Vcc
Pulse input for VISH.
6
23
30
GND3
GND1
GND2
GND
Driver GND.
Camera signal GND.
Video signal GND.
7 DRVOUT
Camera
system CAM
mode black
level: 1.3V
Video
system LIN
mode black
level: 1.4V
Video
system RF
mode DC
level: 2.2V
Driver output.
Standard D range.
Camera system
signal: 870mVp-p
Video system PB RFC
signal: 500mVp-p
Video system LIN
signal: 1.4Vp-p
PB REC
CAM VIDEO
High Low
Video system
PB mode
Video system
PB mode
Camera system
CAM mode
Video system
LIN mode
High
Low
127
1k
127
30k 1k
V
2.4k
46µA
RT
100
1k
Typ.
14mA
50k
127
3k
100
Typ.
2mA
7k
– 4 –
CXA1690Q
Pin
No.
Symbol Pin voltage Equivalent circuit Description
8
CLPDRV
Camera
system CAM
mode black
level: 2V
Video
system LIN
mode clamp
level: 2V
Video
system PB
mode DC
level: 3V
Clamps and outputs
the DRVOUT (Pin 7)
output signal.
The switch for each
mode is closed and the
clamp potentials
applied to this pin by
selecting CAMVIDEO
(Pin 1) or PBRFC (Pin
2).
9
20
27
Vcc3
Vcc1
Vcc2
Vcc
Driver VCC.
Camera signal VCC.
Video signal VCC.
11 VRT 3.88V
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: 4.7µF)
10 VRB 2.02V
2V regulator output
VRB – VRT load:
160Ω or greater.
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: 4.7µF)
91µA
16k
13k
6k
91µA
4k
25k
1.9k
1k
91µA
91µA
127
LIN mode
switch
50µ
157µ
127
86µ
PB mode
switch
1k
400µ
CAM mode
switch
78µ
– 5 –
CXA1690Q
12
OFFSET
20
Vcc to
50
Vcc
This pin offset adjusts the
CLPDRV black level when
the CXA1690 satisfies the
operating conditions for the
camera signal system
(when CAMVI is High and
PBREC is Low).
VCC: approx. 500mV
20/50 VCC: approx.
–50mV
Preset: approx. 70mV
70
–50
V
CC
500
OFFSET voltage (V)
CLPDRV
offset voltage (mV)
VCC
20
50
0
Pin
No.
Symbol Pin voltage Equivalent circuit Description
14 XRS
22
VTH =
50
Vcc
21 SHP
25
VTH =
50
Vcc
22 SHD
High-speed S/H pulse
input for CAMSH
(active: Low).
High-speed S/H pulse
input for SH1
(active: Low).
High-speed S/H pulse
input for SH2 and SH3
(active: Low).
13 PBLK
18
VTH =
50
Vcc
Pulse input for BLK
(active: Low). This pin
functions only when
CAMVI is High and
PBREC is Low, and
calibrates the black
level of the AGC
output waveform.
When the pulse is low,
the DRVOUT potential
is forced to 2V.
46µA
62k
34k
1k
127
24k
200
127
200
15 CLPOB
18
VTH =
50
Vcc
Clamp pulse input for
AGCCLP
(active: Low).
1k
127
100µ
Sampling
127
1k
125k
39µA
39µA
54k
47k
– 6 –
CXA1690Q
Pin
No.
Symbol Pin voltage Equivalent circuit Description
16
AGCCLP
Approx. 2.8V
Capacitor connection for
AGCCLP clamping.
0.1 to 1µF
17
AGCMAX
20
Vcc to
50
Vcc
AGC amplifier MAX gain
adjustment.
18
AGCCONT20Vcc to
50
Vcc
AGC amplifier gain
adjustment. MIN GAIN
for VCC, MAX
GAIN for VCC for both
AGCMAX and
AGCCONT.
19
CCD
LEVEL
DIN input
CCD signal
black level:
approx. 2.6V
CCD level detector
20.5µ
127
4k
300
41µ
20.5µ
41µ
20.5µ
20k
20.5µ
38.4k
62µ
127
34.5k
15k
1k
15.5k
62µ
2k
260µ
200
20
50
1k
2k
127
41µA
2k
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