Datasheet CXA2598M Datasheet (Sony)

Description

The CXA2598M is a PDIC (photodetector IC)
developed as a photodetector for the optical pickup
of CD-R/RW. The photodiode and I-V amplifier operate
at high speed (100MHz). When the strong light is
emitted during write, the delay or ringing is not
occurred because the limiter circuit is included in the
I-V amplifier.

• Focus servo: astigmatic method

• Tracking servo: differential push-pull method

Features

• I-V amplifier (current-voltage conversion circuit)

• RF output of addition of A to D signals

• Wide band (100MHz typ.)

• Output limiter circuit

• Small transparent molded package (SOP)

Applications

Optical pickup for CD-R/RW

Structure

Bipolar silicon monolithic IC

Absolute Maximum Ratings (Ta = 25°C)

• Supply voltage VCC 5.5 V

• Operating temperature Topr –10 to +70 °C

• Storage temperature Tstg –40 to +85 °C

• Allowable power dissipation PD 300 mW

Operating Condition

Supply voltage V

CC 4.5 to 5.5 V

PDIC for CD-R/RW

– 1 –

E00342-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.

CXA2598M

PD-S-12 (Plastic)

– 2 –

CXA2598M

Electrical and Optical Characteristics (VCC = 5.0V, VC = 2.5V, Ta = 25°C)

Note 1) Output offset voltage: Vc is the reference.
Note 2) Output voltage: Vc is the reference. However, the offset voltage is excluded.
Note 3) Output voltage, offset temperature drift, frequency response, group delay difference, settling time,

slew rate: Confirmation of design.

Note 4) Measurement by the optical input: Measurement is made by emitting the light to the center of each

photodiode.

Item
Current consumption
Output offset voltage (A to D)
Output offset voltage (E to H)
Output offset voltage (RF)

Output offset voltage difference

Offset temperature drift (A to H)
Offset temperature drift (RF)
Output voltage (A to D)
Output voltage (E to H)
Output voltage (RF)
Maximum output voltage (A to H, RF)

Frequency response 1 (A to D)

Frequency response 1 (E to H)

Frequency response 1 (RF)

Frequency response 2 (A to D)

Frequency response 2 (RF)

Group delay difference (A to D)
Group delay difference (RF)
Settling time 1 (A to D)
Settling time 1 (E to H)
Settling time 2 (A to D)
Slew rate (A to D)
Slew rate (E to H)

Symbol
ICC
Voff
Voff
Voff

∆Voff

∆Voff/T
∆Voff/T

VO
VO
Vo
VO

fc

fc

fc

∆G

∆G

∆Gd
∆Gd

Tset1
Tset1
Tset2
SR
SR

Conditions
In the dark
In the dark, Vc reference
In the dark, Vc reference
In the dark, Vc reference
(A + B) – (C + D), in the dark
(A + D) – (B + C), in the dark
(A + C) – (B + D), in the dark
(E + G) – (F + H), in the dark
In the dark
In the dark

λ = 780nm, Po = 10µW
λ = 780nm, Po = 10µW
λ = 780nm, Po = 10µW
λ = 780nm, Po = 500µW
λ = 780nm

Po = 10µWDC, 4µWp-p
100kHz reference, –3dB

λ = 780nm
Po = 10µWDC, 4µWp-p
100kHz reference, –3dB

λ = 780nm
Po = 10µWDC, 4µWp-p
100kHz reference, –3dB

λ = 780nm
Po = 10µWDC, 4µWp-p
35MHz/100kHz

λ = 780nm
Po = 10µW

DC, 4µWp-p

35MHz/100kHz
100kHz to 35MHz
100kHz to 35MHz
Output 500mV → 5mV
Output 500mV → 5mV
Output 500mV → 0.5mV

—
—

Min.

—
–30
–25

–100

–20
–20
–20
–20

–100

–1.0

82
338
165

3.9

60

12

60

–0.5

–1.0

—

—

—

—

—
200

40

Typ.

16

0
0
0
0
0
0

0
—
—

110
450
220

4.0

100

20

100

0

0.5

0.5

0.5
—
—
—
—
—

Max.

25
30
25

100

20
20
20
20

100

1.0
138
563
275

—

—

—

—

0.5

1.0

2

2
40
70
70
—
—

Unit

mA
mV
mV
mV
mV
mV
mV
mV

µV/°C

mV/°C

mV
mV
mV

V

MHz

MHz

MHz

dB

dB

ns
ns
ns
ns

ns
V/µs
V/µs

– 3 –

CXA2598M

Measurement Circuit

1

2

3

4

5

7

8

9

10

11

12

6

Vcc

Vcc

Ho

Ao

Bo

Fo

Vc

Vc

GND

Go

Do

Co

Eo

RF

∗

All loads are 2.5kΩ//20pF.

Photodetector Position

H

12

Top view

7

16

GD

A

CFE

B

Center of package

45 deg.

0.52

Reference
surface

Surface that senses
the indident light

(Unit : mm)

Deviation from the center of photodetector

X, Y : ±0.2
Z: ±0.2
θ : ±2°

– 4 –

CXA2598M

Photodetector Pattern Dimensions (Unit: µm)

555

5

160

160

HG FE

DC

AB

16040 16040

45 deg.

Circuit Block Diagram

1

2

3

4

5

6

7

8

910

11

12

R2

R2

E

AoBoCoDo

F

C

B

R1

R1

D

A

R1

R1

G

H

R2

GND Go Do Co Eo RF

VCC Ho Ao Bo Fo Vc

R2

R1 = 29kΩ, R2 = 118kΩ
A, B, C, D, E, F, G and H are the photodiodes. (Optical sensitivity: Approximately 0.40A/W)

– 5 –

CXA2598M

Pin Description

Pin No.

3
4
9

10

Symbol

Ao
Bo
Co
Do

I/O Equivalent circuit Description

O

Output of voltage signals converted
from optical signals

3
4
9

10

2
5
8

11

Ho
Fo
Eo
Go

O

Output of voltage signals converted
from optical signals

118k

2
5
8

11

6VC I

For dual power supply

: GND

For a single power supply

: center voltage input

6

12 GND

For dual power supply

: negative power supply

For a single power supply

: GND

1VCC I Positive power supply

7 RF O Output of addition of Ao to Do signals

7

– 6 –

CXA2598M

Example of Representative Characteristics

2

0

–2

Gain [dB]

–4

–6

–8

1 3 5 7 10 30

50 70 100

300

A to D I-V output frequency response

Frequency [MHz]

2

0

–2

Gain [dB]

–4

–6

–8

1 3 5 7 10 30

50 70 100

300

RF output frequency response

Frequency [MHz]

2

0

–2

Gain [dB]

–4

–6

–8

1 3 5 7 10 30

50 70 100

300

E to H I-V output frequency response

Frequency [MHz]

– 7 –

CXA2598M

Notes on Operation

1. Connection to RF amplifier

The voltage input-type RF amplifier should be used because the CXA2598M is the voltage output type. The
noise allowance is dramatically increased compared to the case where the conventional photodiode and the
current input-type RF amplifier are used.

2. Power supply

The CXA2598M can be used with a single power supply or dual 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 from the RF amplifier or some other device.

Dual power supply

Single power supply

(Pin 1) VCC
Positive power supply
Positive power supply

(Pin 12) GND

Negative power supply

GND

(Pin 6) VC

GND

Center voltage

The potential difference between the Vcc pin and the GND pin should be in the range of 4.5 to 5.5V in both of
a single power supply and dual power supply.

3. Soldering

The reflow soldering is not guaranteed for the CXA2598M.

4. Mechanical strength for package

The mechanical strength for the package is not guaranteed for the CXA2598M.
Do not employ the mounting method which gives much weight to the package.

5. Visual inspection standard

Another specifications and limit samples must be exchanged regarding visual inspection standards for the
photodetector.

– 8 –

CXA2598M

Package Outline Unit: mm

SONY CODE
EIAJ CODE

JEDEC CODE

M

PACKAGE MASS

0.05g

PD-S-12

PD-S-12

0.16

5.0 – 0.1

+ 0.4

12

7

1

6

0.3 MIN

0.8

0.3 ± 0.1

φ2.5 Mirror Surface

4.0

– 0.1

+ 0.3

8.0

±

0.4

Datum Plane

15

˚

10˚

0.15 – 0.05

+ 0.1

1.5 ± 0.1

0.9 ± 0.1

5˚

10˚

Sony Corporation