Sony CXA2598M Datasheet

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

∆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 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

–0.5

–1.0

—

— 200

Typ.

0 0 0 0 0 0

0 — —

110 450 220

4.0

100

0.5

0.5 — — — — —

Max.

25 30 25

100

20 20 20 20

100

1.0 138 563 275

—

0.5

1.0

2 40 70 70 — —

Unit

mA mV mV mV mV mV mV mV

µV/°C

mV/°C

mV mV mV

MHz

ns ns ns ns

ns V/µs V/µs

– 3 –

CXA2598M

Measurement Circuit

Vcc

GND

∗

All loads are 2.5kΩ//20pF.

Photodetector Position

Top view

CFE

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°

+ 5 hidden pages