High-speed Buffer Amplifier for CCD Image Sensor
CXA3741AUR
Description
The CXA3741UR is a high-speed buffer amplifier IC with built-in switches.
(Applications: CCD image sensor output buffers, digital still cameras, camcorders, other general buffers)
Features
Power consumption: 26 mW (typ.)
(IDRV = 50μA (220kΩ when V
CC
= 15V), ISF current = 0, during no signal)
Push-pull output
High-speed response: 500 V/μs (IDRV = 50μA (220kΩ when V
CC
= 15V), C
L
= 20pF)
Internal sink current mode for CCD source follower output. Settable by external resistance R
ISF
Sink current and drive current with each built-in switch. Each current value can be set by an external
resistance.
Structure
Bipolar silicon monolithic IC
Absolute Maximum Ratings
(Ta = 25
°
C)
Supply voltage
Input voltage
Storage temperature
Allowable power dissipation
V
CC
IN
Tstg
P
D
16
GND – 0.3 to V
CC
+ 0.3
–65 to +150
0.73
V
V
°
C
W
(when mounted on a two-layer board; 30mm
×
30mm, t = 0.8mm)
Recommended Operating Conditions
Supply voltage
Operating temperature
V
CC
Ta
9 to 15.5
–20 to +75
V
°
C
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.
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E07711
CXA3741AUR
Block Diagram and Pin Description
SFCNT
1
IDRV1
4
3
IDRV0
2
GND
V
CC
5
16 DRVCNT
ISF0 6
15 GND
ISF1 7
14 OUT
NC 8
13 NC
9
10
11
12
GND
IN
GND
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NC
CXA3741AUR
Pin Description and I/O Pin Equivalent Circuit
Standard
voltage
level
0V
15V
0V
0V
0V
Pin
No.
4
5
9
11
15
Symbol
GND
V
CC
GND
GND
GND
I/O
—
—
—
—
—
Equivalent circuit
—
—
—
—
—
GND
Description
Power supply
GND
GND
GND
Switches the sink current
setting for CCD with open
source output.
When the SFCNT pin
(Pin 16) input logic is low,
the sink current is set
according to the current
set by the ISF0 pin (Pin 6).
When high, the sink
current is set according to
the current set by the ISF1
pin (Pin 7).
Switches the drive current
setting.
When the DRVCNT pin
(Pin 16) input logic is low,
the drive current is set
according to the current set
by the IDRV0 pin (Pin 2).
When high, the drive
current is set according to
the current set by the
IDRV1 pin (Pin 3).
External resistor
connection for setting the
drive current.
Connect external resistors
between these pins and
V
CC
(Pin 5).
When not using this
function, connect these
pins to GND.
*The
minimum value for
external resistors should
be 100kΩ (when V
CC
is
15V).
1
SFCNT
I
CMOS
V
CC
10µA
10µA
2k
1
16
2k
60k
60k
16
DRVCNT
I
CMOS
GND
V
CC
2
IDRV0
I
—
30k
2
3
30k
3
IDRV1
I
—
GND
20k
20k
-3-
CXA3741AUR
Pin
No.
Symbol
I/O
Standard
voltage
level
V
CC
Equivalent circuit
Description
External resistor
connection for setting the
CCD with open source
output sink current.
Connect external resistors
between these pins and
V
CC
(Pin 5).
When not using this
function, connect these
pins to GND.
*The
minimum value for
external resistors should
be 100kΩ (when V
CC
is
15V).
6
ISF0
I
—
30k
6
7
30k
7
ISF1
I
—
GND
20k
20k
V
CC
1.5k
10
×
IDRV
10
IN
I
CCD
output
voltage
10
Input
10µA
GND
58
×
IISF
10
×
IDRV
2k
V
CC
50
14
OUT
O
≈IN
14
Output
50
GND
-4-
CXA3741AUR
Electrical Characteristics
(Ta = 25
°
C, V
CC
= 15V, R
IDRV0
= 220kΩ, R
IDRV1
= 470kΩ, ISF0 and ISF1 pins: connected to GND)
Item
Symbol
Measurement
conditions
IN = 10V,
R
DRV0
= 220kΩ,
R
DRV1
= 470kΩ
DRVCNT = 0V
*1
Min.
Typ.
Max.
Unit
Supply current
I
CC
1.5
1.7
1.9
mA
Voltage gain
I/O offset voltage
V
GAIN
V
OFFSET
IN: F10Vdc
ΔV
= 1V
GAIN =
ΔOUT/ΔV
IN = 10V
V
OFFSET
= OUT-IN
R
IDRV
= 100kΩ
R
IDRV
= 150kΩ
R
IDRV
= 220kΩ
R
IDRV
= 330kΩ
IN = 10V,
ISF0, 1 = 0V,
IDRV0, 1 = 220kΩ
IN = 10V,
ISF0, 1, IDRV0, 1 = 0V
—
–100
3.3
2.9
2.5
2.1
–6.0
3.0
0.999
—
—
—
—
—
3.0
9.0
—
100
V
CC
– 2.0
V
CC
– 1.85
V
CC
– 1.8
V
CC
– 1.7
20
15
V/V
mV
I/O voltage range
V
RANGE
V
μA
μA
Input bias current
I
BIAS
Sink current
Switch control voltage
“High”
Switch control voltage
“Low”
*1
I
SINK
IN = 10V,
R
ISF0
= 220kΩ,
R
ISF1
= 470kΩ
SFCNT = 0V
2.6
2.9
3.2
mA
VcontH
V
DD
= 3.0
±
0.3V
VcontL
2.025
—
—
—
—
0.825
V
V
Voltage gain
10.5V
IN
ΔV
= 1V
9.5V
OUT
ΔOUT
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