CXA2610N Laser Driver Description The CXA2610N is a laser driver IC for optical discs. This IC supports higher optical power output speeds. Features • LD driver with excellent driving capability • Write current of 250mA (max.) possible by setting the IIN2 (Pin 2) and IIN3 (Pin 5) external resistors • Rise time ≈ 3ns • Fall time ≈ 4ns • The oscillation frequency of the built-in oscillation circuit can be set from 100 to 600MHz by connecting the OSCFR (Pin 4) external resistor to GND. • The oscillator amplitude initial value of the built-in oscillation circuit can be set by connecting the OSCGA (Pin 12) external resistor to GND, and the oscillator amplitude can be adjusted by the IINR input current value. • Oscillation ON/OFF can be set as desired. • Single +5V power supply • TTL/CMOS control for control system 16 pin SSOP (Plastic) Absolute Maximum Ratings • Supply voltage Vcc 5.5 • Operating temperature Topr –10 to +70 • Storage temperature Tstg –65 to +150 Operating Conditions Supply voltage V °C °C 4.5 to 5.5 V Applications • CD-R driver • CD-RW driver • DVD driver • Writable optical driver • Laser diode current switching 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– E99320-PS CXA2610N Block Diagram IINR 1 V-I 16 Vcc IIN2 2 V-I 15 Vcc GND 3 OSCFR 4 IIN3 5 CONTR 6 CONT2 7 CONT3 8 Current SW Driver 14 LD0 13 GND OSC V-I 12 OSCGA 11 ENABLE 10 OSCENA TTL 9 Vcc Pin Description Pin No. Symbol I/O Description 1 IINR I Oscillation level adjustment. 2 IIN2 I LD drive current setting input. 3 GND — 4 OSCFR I Oscillation frequency adjustment. 5 IIN3 I LD drive current setting input. 6 CONTR I LD drive current output setting. 7 CONT2 I LD drive current output setting. 8 CONT3 I LD drive current output setting. 9 Vcc 10 OSCENA I Oscillation ON for read/forced oscillation ON control. 11 ENABLE I LD drive current ON/OFF control. (High: ON, Low: OFF) 12 OSCGA I Oscillation level initial value setting. 13 GND — Ground. 14 LD0 O LD anode side connection. 15 Vcc — VCC. 16 Vcc — VCC. — Ground. VCC. –2– Current consumption 2 Current consumption 3 Pin voltage 1 Pin voltage 2 Output drive current Output drive current Output drive current Input/output current gain Input/output current gain 2 3 4 5 6 7 8 9 10 –3– Fall time Overshoot CONT delay 1 CONT delay 2 LD delay 1 LD delay 2 Oscillation frequency Oscillation level 13 14 15 16 17 18 19 20 Logic Low level Logic High level Input resistance 21 22 23 Logic Rise time 12 AC items Input/output current gain Current consumption 1 1 11 Measurement item Measurement No. Electrical Characteristics — — — VTHH ZIN 1.3 VTHL OSCLE OSCFR — — — — — — — — — — — — 2.0 2.0 60 Input impedance for IINR, IIN2 and IIN3 CONTR, CONT2, CONT3, OSCENA, ENABLE 1.3 85 175 252 375 2 77 Oscillation level when IINR = 2V CONTR, CONT2, CONT3, OSCENA, ENABLE 189 Oscillation frequency 2.2 Time from 50% of ENABLE (High → Low) to 50% of output final value H→L LDELAY2 2.0 2.0 4.4 Time from 50% of ENABLE (Low → High) to 50% of output final value L→H 2.0 LDELAY1 1.3 3.4 Time from 50% of CONT3 (Low → High) to 50% of output final value 3.1 H→L 1.3 CDELAY2 CDELAY1 Time from 50% of CONT3 (High → Low) to 50% of output final value — 4 3 120 136 145 120 133 145 H→L 2.0 1.3 IOUT = 40mA (CONTR) + 40mA (CONT2), settling 10 to 90% IOUT = 40mA (CONTR) + 40mA (CONT2) 2.0 Current gain measurement for IIN3 (∆IOUT/∆IIN) H→L 2.0 95 Current gain measurement for IINR (∆IOUT/∆IIN) OVS 2.0 145 163 175 Output current for IIN3 pin input 5V Current gain measurement for IIN2 (∆IOUT/∆IIN) 145 157 175 Output current for IIN2 pin input 5V 104 115 115 125 145 Output current for IINR pin input 5V 103 120 80 IOUT = 40mA (CONTR) + 40mA (CONT2), settling 10 to 90% H→L 1.3 2.0 1.3 105 75 52 1.21 1.257 1.3 78 55 35 Pin voltage measurement Pin voltage measurement 50 35 Current consumption for IINR input voltage where oscillation level = 47mAp-p Current consumption when CONTR = Low for ICC2 (OSC: ON) 20 Min. Typ. Max. OSC: L (write mode). LD: OFF L→H 1.3 2.0 2.0 1.3 2.0 2.0 2.0 2.0 1.3 1.3 1.3 Measurement condition and method TF TR IGAIN3 1.3 2.0 IGAIN2 1.3 2.0 2.0 IOUT2 2.0 2.0 1.3 1.3 IOUT1 — — IGAIN1 — VLE — 2.0 — 2.0 — VFR 2.0 IOUT3 1.3 2.0 CONT3 OSCENA ENABLE Control status CONTR CONT2 ICC3 ICC2 ICC1 Symbol Ω V V mAp-p MHz ns ns ns ns % ns ns — — — mA mA mA mV V mA mA mA Unit (Ta = 25°C, Vcc = 5V) CXA2610N CXA2610N Electrical Characteristics Measurement Circuit Vcc 22µ 0.1µ GND V1 3.9kΩ IINR 1 V-I 16 2 V-I 15 V2 3.9kΩ IIN2 Current SW 3 4.3kΩ 10Ω Driver 14 13 4 20Ω V5 3.9kΩ 5 IIN3 OSC V-I 12 V11 V6 V10 V7 7 CONT2 10 TTL V8 CONT3 ENABLE 11 6 CONTR 9 8 –4– OSCENA CXA2610N Description of Functions (1) LD drive current value setting The current controlled by the current setting pins IINR, IIN2 and IIN3 is output from the LD0 pin. The current flowing to the LD0 pin can be set independently for IINR, IIN2 and IIN3 by CONTR, CONT2 and CONT3. (2) LD drive current forced OFF Forced OFF is enabled by setting the ENABLE pin Low. (3) Oscillation circuit The oscillation circuit is turned ON forcibly by setting the OSCENA pin Low. (OSCENA × CONTR × (CONT2 + CONT3)) The oscillation circuit is turned ON by setting the OSCENA pin High only for read. (OSCENA × CONTR × CONT2 × CONT3) (4) Oscillation frequency adjustment The oscillation frequency can be varied by the external resistance value connected to the OSCFR pin. (5) Oscillation level adjustment The oscillation level initial value can be set by the external resistance value connected to the OSCGA pin. The oscillation level can be adjusted by varying the IINR input current value. In addition, the read block DC compensation current IR that flows when oscillation is OFF is independent of the OSCGA pin external resistance value, and is constant. Level adjustment 0 IINR input current [µA] For large OSCGA external resistance (Io ≈ 0mA) For small OSCGA external resistance Initial setting Oscillator amplitude [mAp-p] IR – Output current [mA] IO – Oscillator amplitude [mAp-p] Oscillator OFF 12 2k IO IR < IO IO IR > IO IINR input current [µA] OSCGA pin voltage 40 × OSCGA external resistance 9 [mAp-p] (6) Logic The logic table for the CONTR, CONT2, CONT3 and ENABLE pins is shown below. Be sure to also check the timing chart on page 7. ENABLE CONTR CONT2 CONT3 LD0 L X X X OFF H H H H OFF H L H H IINR H L L H IINR + IIN2 H L H L IINR + IIN3 H L L L IINR + IIN2 + IIN3 –5– IO + 2 (IR – IO) IR OSCGA external resistance [Ω] IO ≈ 2IR CXA2610N Notes on Operation • Locate the external resistors connected to the IINR, IIN2 and IIN3 pins close to the IC package to prevent the effect from other signal lines. • Make the wiring distance between the output LD0 pin and the laser diode as short as possible. If this wiring is longer, the output waveform characteristics show that the rise and fall times (Tr and Tf) become slower as the ringing becomes larger. • The external resistor connected to Pin 10 (OSCGA) should be within the range from 12Ω to 2kΩ. In addition, this resistance value should be set in consideration of the laser diode Ith so that the oscillation level at IINR = 0V does not exceed the read power. • Temperature assurance The junction temperature for the CXA2610N laser driver should not exceed 150°C. In addition, the power consumption (PO) should be the allowable power dissipation (PD) or less, and the IC should be used with a lowered thermal resistance (θj-a) for board mounting so that normal operation is possible at the maximum operating temperature of 70°C. Widening the GND area on the set board and other heat radiation countermeasures within the set are necessary in order to lower θj-a. This is because the CXA2610N thermal resistance (θj-a) differs according to the board, and the power consumption (PO) is also difficult to predict with future increases in power. Obtain the thermal resistance (θj-a) and power consumption (PO) of the package by the following method. Power consumption (PO): Oscillator ON state (OSC level = 47mAp-p) PO = (ICC2 + (total of each input current × 10)) × VCC + (IOP × (VCC – VOP)) ICC2: See page 3 of this Data Sheet. IOP: Output drive current flowing from the LD0 pin to the laser diode VOP: Laser diode operating voltage or, the power consumption can also be obtained as follows. PO = (ICC × VCC) – (IOP × VOP) ICC: Device current consumption (including IOP) during operation Thermal resistance (θj-a) when mounted on a board The diode temperature coefficient is –2.27mV/°C (1) ENABLE pin voltage – VCC pin voltage after applying 0V to the IINR, IIN2 and IIN3 pins = V1 (2) ENABLE pin voltage – VCC pin voltage immediately after applying 3V to IINR = V2 (3) ENABLE pin voltage – VCC pin voltage after applying 3V to the IINR pin and reaching a thermally balanced state = V3 The change in current consumption between (1) and (2) ∆ICC = (3V/(Rext + 250Ω)) × 104. This ∆ICC causes the ENABLE pin internal forward protective diode connection VCC voltage to vary (∆VCC) due to the effects of the wiring resistance from the VCC pin voltage which is used as the reference. The voltage fall coefficient (VR) used to correct this ∆VCC can be obtained by VR = (V1 – V2)/∆ICC. Using VR to apply correction to V3 yields the equation: (∆ICC × VR) + V3 = V4. From this, ∆Tj = (V4 – V2) mV/–2.27mV/°C, and θj-a = ∆Tj/PO [°C/W]. • Allowable power dissipation (PD) ≥ PO [W] PD = (150°C – ambient temperature)/θj-a • Maximum operating temperature 70 °C (150°C – ∆Tj) ≥ 70°C Thus, if θj-a can be lowered from these two conditions, the maximum operating temperature can also be raised. VCC Diode measurement point 1MΩ ENABLE VCC 11 10V 10 5V 9 5V 5V Thermal Resistance Measurement Circuit –6– CXA2610N Timing Chart LD0 ENABLE CONTR CONT2 CONT3 OSCENA Application Circuit 1 IINR Vcc 16 2 IIN2 Vcc 15 3 GND LD0 14 4 OSCFR 5 IIN3 TTL/CMOS 6 CONTR ENABLE 11 TTL/CMOS TTL/CMOS 7 CONT2 OSCENA 10 TTL/CMOS TTL/CMOS 8 CONT3 Vcc Voltage DAC GND 13 LD OSCGA 12 9 Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same. –7– CXA2610N Example of Representative Characteristics High frequency oscillator amplitude vs. Read current characteristics 250 150 100 OSCGA external resistance value 20Ω 2kΩ 50 0 0 200 400 600 800 1000 1200 1400 IINR input current [µA] High frequency oscillator amplitude frequency dependence (OSCGA = 20Ω) 200 180 160 Oscillator amplitude [mAp-p] Oscillator amplitude [mAp-p] 200 140 120 100 80 60 Approximately 200MHz Approximately 400MHz 40 20 0 0 200 400 600 800 IINR input current [µA] –8– 1000 1200 1400 CXA2610N High frequency oscillator frequency vs. External resistance 700 600 Oscillator frequency [MHz] 500 Oscillator frequency 400 300 200 100 0 10 1 OSCFR pin external resistance value [kΩ] IIN3 input/output current characteristics 350 300 Output current [mA] 250 200 Supply voltage 4.5V 5V 5.5V 150 100 50 0 0 500 1000 1500 Input current [µA] –9– 2000 2500 3000 CXA2610N Package Outline Unit: mm 16PIN SSOP (PLASTIC) + 0.2 1.25 – 0.1 ∗5.0 ± 0.1 0.1 9 16 6.4 ± 0.2 ∗4.4 ± 0.1 A 8 1 0.65 b 0.13 M (0.15) (0.22) b=0.22 ± 0.03 + 0.03 0.15 – 0.01 + 0.1 b=0.22 – 0.05 + 0.05 0.15 – 0.02 B 0.5 ± 0.2 0.1 ± 0.1 DETAIL B : SOLDER DETAIL B : PALLADIUM NOTE: Dimension “∗” does not include mold protrusion. 0° to 10° PACKAGE STRUCTURE DETAIL A PACKAGE MATERIAL EPOXY RESIN SOLDER / PALLADIUM PLATING SONY CODE SSOP-16P-L01 LEAD TREATMENT EIAJ CODE SSOP016-P-0044 LEAD MATERIAL 42/COPPER ALLOY PACKAGE MASS 0.1g JEDEC CODE NOTE : PALLADIUM PLATING This product uses S-PdPPF (Sony Spec.-Palladium Pre-Plated Lead Frame). – 10 –