SONY CXA1915AN

CXA1915AN
I-V Photo IC for MiniDisc
Description
The CXA1915AN is a photo IC developed as a
photo detector for the optical pickup of MiniDisc. The
photodiode for RF signal detection has a built-in I-V
amplifier and features low output impedance for
stable output.
• Focus servo:
astigmatic method
• Tracking servo: three-spot method
• Magneto optical signal (RF signal) detection:
Wollaston prism method
Features
• I-V amplifier (current-voltage conversion circuit)
• Ultra-compact transparent molded package
(SSOP)
Applications
Optical pickup for MiniDisc
16 pin PD-S (Plastic)
Absolute Maximum Ratings (Ta=25°C)
• Supply voltage
VCC
6
V
• Operating temperature Topr
–20 to 90
°C
• Storage temperature
Tstg
–40 to 90
°C
• Allowable power dissipation
PD
150
mW
Recommended Operating Conditions
• Supply voltage
VCC
2.5 to 5.5
V
Structure
Bipolar silicon monolithic IC
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.
—1—
E94X43-TE
CXA1915AN
Photo Detector Pattern Dimensions
J
35
A
135
145
B
5
Package center
5
160
1.75 mm from reference side
160
C
F
D
E
70
135
150
0.45 mm from package center
2.20 mm from reference side
I
(Unit: µm)
Circuit Block Diagram
Vcc
Jo
Bo
GND
Ao
Eo
12
11
10
9
8
7
R
J
B
F
I
A
E
C
D
R
1
2
3
4
5
6
Vc
Io
GND
Fo
Co
Do
R=115kΩ
A, B, C, D, E, F, I, and J are photodiodes.
—2—
CXA1915AN
Electrical and Optical Characteristics
(VCC=3.0V, VC=1.5V, Ta=25°C)
Item
Symbol
Current consumption
ICC
Dark current (A to F)
ID
Optical sensitivity (A to F)
S
Output offset voltage (I, J)
Voff
Output offset voltage difference (I-J) ∆Voff
Output voltage (I, J)
VO
Maximum output voltage (I, J)
Vomax
Frequency response (I, J)
fc
Conditions
In the dark
In the dark
PO=5µW, λ = 780nm
In the dark
In the dark
PO=5µW, λ = 780nm
PO=100µW, λ = 780nm
100kHz reference, -3 dB
Min.
Typ.
2.2
0.3
-10
-10
100
2.7
1.8
0.4
5.5
0
130
2.8
2.3
Note)
1. Vc is reference for output voltage and output offset voltage.
2. GND is reference for maximum output voltage.
3. Output voltage and frequency response are subject to conformation of design.
Measurement Circuit
100pF
4kΩ
1k Ω
1k Ω
1k Ω
3.0V
12
11
10
9
8
7
Vcc
Jo
Bo
GND
Ao
Eo
Vc
Io
GND
Fo
Co
Do
1
2
3
4
5
6
1.5V
100pF
4kΩ
1kΩ
—3—
1kΩ
1kΩ
Max.
3.2
4.0
10
10
160
Unit
mA
nA
A/W
mV
V
MHz
CXA1915AN
Photo Detector Position
1.75
Reference side
J
Photo detector center
I
0.45
1
0.38
2.20
Reference side Photo detector center
Photo detector side Reference side
(Unit: mm)
Accuracy in position of photo detector (the reference side shown above is reference.)
X, Y : ±0.2 mm
Z
: ±0.2 mm
θ
: ±2°
—4—
CXA1915AN
Example of Representative Characteristics
A to F dark current
vs. Ambient temperature characteristics
100
ID-Dark current (pA)
VCC=3.0V, VC=1.5V
in the dark state
10
E, F
A to D
1
0.1
0
25
50
75
100
Ta-Ambient temperature (°C)
I and J offset voltage
vs. Ambient temperature characteristics
10
VCC=3.0V, VC=1.5V
in the dark state
Voff-Offset voltage (mV)
8
6
4
2
0
–25
0
25
50
75
100
Ta-Ambient temperature (°C)
Current consumption
vs. Ambient temperature characteristics
5
ICC-Current consumption (mA)
In the dark state
4
3
VCC=6.0V, VC=3.0V
2
VCC=3.0V, VC=1.5V
1
VCC=2.5V, VC=1.25V
0
–25
0
25
50
75
Ta-Ambient temperature (°C)
—5—
100
CXA1915AN
Pin Description
Pin No.
Symbol
I/O
Equivalent circuit
Description
For a dual positive/negative
power supply: GND
For a single power supply:
center voltage input
129
1
VC
I
1
500µA
2
IO
11
JO
Output of electrical signals
converted from optical
signals
129
O
2
16k
11
8k
VC
3
9
GND
4
5
6
7
8
10
FO
CO
DO
EO
AO
BO
For a dual positive/negative
power supply: negative
power supply
For a single power supply:
GND
I
4
5
O
129
Light
6
7
Photo
current
8
Output of electrical signals
converted from optical
signals (cathode pin of
photodiode)
Photodiode
10
12
VCC
Positive power supply
I
—6—
CXA1915AN
Notes on Operation
1. Connection to RF amplifiers
In the CXA1915AN, the RF signals (I, J) are of the voltage-output type. Therefore, the RF amplifier should
have an I-V amplifier at the input block because the servo signals (A to F) are of current-output type.
2. Power supply
The CXA1915AN can be used either with a dual positive/negative power supply or with a single power
supply. However, this IC is not provided with a center voltage generating circuit, and so when used with a
single power supply the center voltage must be supplied by an RF amplifier or some other device.
Power supply connections for each case are as follows.
(12) VCC
(3) (9) GND
Dual positive/
negative power supply
Positive power supply
Negative power supply
GND
Single power supply
Positive power supply
GND
Center voltage
Note)
(1) VC
Pins 3 and 9 are shorted in the IC.
For both a dual positive/negative power supply and a single power supply, the voltage difference between
the Vcc and GND pins should be within the range of 2.5 V and 5.5 V.
—7—
CXA1915AN
Unit : mm
PD-S-16
1.8 ± 0.2
0.985 ± 0.1
∗3.5 ± 0.1
0.145
0.1
5.5 ± 0.2
A
M
+ 0.1
0.1 – 0.05
+ 0.05
0.22 – 0.04
0.5 ± 0.15
(0.2)
+ 0.025
0.145 – 0.015
0.22
Datum plane
(0.125)
0.5
0.1
10
°
15° ± 1° (All sides)
φ2 Mirror
∗3.5 ± 0.1
Package Outline
B
0° to 10°
DETAIL A
DETAIL B
NOTE: Dimension “∗” does not include mold protrusion.
SONY CODE
PD-S-16
EIAJ CODE
JEDEC CODE
PACKAGE WEIGHT
—8—
0.04g