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