CXA2598M

CXA2598M PDIC for CD-R/RW 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 • Operating temperature Topr –10 to +70 • Storage temperature Tstg –40 to +85 • Allowable power dissipation PD 300 Operating Condition Supply voltage PD-S-12 (Plastic) V °C °C mW VCC 4.5 to 5.5 V 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– E00342-PS CXA2598M Electrical and Optical Characteristics Item Current consumption Output offset voltage (A to D) Output offset voltage (E to H) Output offset voltage (RF) Symbol ICC Voff Voff Voff 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 Output offset voltage difference ∆Voff (A + D) – (B + C), in the dark (A + C) – (B + D), in the dark (E + G) – (F + H), in the dark Offset temperature drift (A to H) Offset temperature drift (RF) Output voltage (A to D) Output voltage (E to H) Output voltage (RF) ∆Voff/T ∆Voff/T VO VO Vo 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 = 10µWDC, 4µWp-p 35MHz/100kHz 100kHz to 35MHz 100kHz to 35MHz Output 500mV → 5mV Output 500mV → 5mV Output 500mV → 0.5mV — — (VCC = 5.0V, VC = 2.5V, Ta = 25°C) Min. — –30 –25 –100 –20 –20 –20 –20 –100 –1.0 82 338 165 3.9 60 Typ. 16 0 0 0 0 0 0 0 — — 110 450 220 4.0 100 Max. 25 30 25 100 20 20 20 20 100 1.0 138 563 275 — — Unit mA mV mV mV mV mV mV mV µV/°C mV/°C mV mV mV V MHz Maximum output voltage (A to H, RF) VO Frequency response 1 (A to D) fc Frequency response 1 (E to H) fc 12 20 — MHz Frequency response 1 (RF) fc 60 100 — MHz Frequency response 2 (A to D) ∆G –0.5 0 0.5 dB 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) ∆G ∆Gd ∆Gd Tset1 Tset1 Tset2 SR SR –1.0 — — — — — 200 40 0.5 0.5 0.5 — — — — — 1.0 2 2 40 70 70 — — dB ns ns ns ns ns V/µs V/µs 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 –2– photodiode. CXA2598M Measurement Circuit Vcc 1 Vcc GND 12 2 Ho Go 11 3 Ao Do 10 4 Bo Co 9 5 Fo Eo 8 6 Vc Vc RF 7 ∗ All loads are 2.5kΩ//20pF. Photodetector Position Top view 12 7 45 deg. E C D Center of package 1 H G A B F 6 0.52 Deviation from the center of photodetector X, Y : ±0.2 Z : ±0.2 θ : ±2° Reference surface Surface that senses the indident light (Unit : mm) –3– CXA2598M Photodetector Pattern Dimensions (Unit: µm) 40 16 0 16 0 C F E A B 5 5 5 40 16 0 H G D 45 deg. 16 0 5 Circuit Block Diagram GND 12 Go 11 Do 10 Co 9 Eo 8 RF 7 R2 R1 R1 R2 G D C E Ao Bo Co Do H A B F R2 R1 R1 R2 1 VCC 2 Ho 3 Ao 4 Bo 5 Fo 6 Vc R1 = 29kΩ, R2 = 118kΩ A, B, C, D, E, F, G and H are the photodiodes. (Optical sensitivity: Approximately 0.40A/W) –4– CXA2598M Pin Description Pin No. Symbol I/O Equivalent circuit Description 3 4 9 10 Ao Bo Co Do 3 O 4 9 10 Output of voltage signals converted from optical signals 2 5 8 11 Ho Fo Eo Go 2 O 5 8 11 118k Output of voltage signals converted from optical signals 7 RF O 7 Output of addition of Ao to Do signals 12 GND For dual power supply : negative power supply For a single power supply : GND 6 VC I 6 For dual power supply : GND For a single power supply : center voltage input 1 VCC I –5– Positive power supply CXA2598M Example of Representative Characteristics A to D I-V output frequency response 2 0 Gain [dB] –2 –4 –6 –8 1 3 5 7 10 30 50 70 100 300 Frequency [MHz] RF output frequency response 2 0 Gain [dB] –2 –4 –6 –8 1 3 5 7 10 30 50 70 100 300 Frequency [MHz] E to H I-V output frequency response 2 0 Gain [dB] –2 –4 –6 –8 1 3 5 7 10 30 50 70 100 300 Frequency [MHz] –6– 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. (Pin 1) VCC Dual power supply Single power supply 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. –7– CXA2598M Package Outline Unit: mm PD-S-12 + 0.4 5.0 – 0.1 φ2.5 Mirror Surface 0.9 ± 0.1 12 7 1.5 ± 0.1 + 0.1 0.15 – 0.05 15˚ + 0.3 4.0 – 0.1 8.0 ± 0.4 Datum Plane 1 0.3 MIN 0.3 ± 0.1 0.8 10˚ 6 0.16 M 5˚ SONY CODE EIAJ CODE JEDEC CODE PD-S-12 PACKAGE MASS 0.05g –8– 10˚ Sony Corporation