5V 155Mbps LASER DIODE DRIVER WITH OUTPUT ENABLE
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1 V 1Mbps LASER DIODE DRIVER WITH OUTPUT ENABLE FEATURES DESCRIPTION Up to 1Mbps operation Modulation current to 2mA PECL output enable Differential PECL inputs Single V power supply Available in a tiny 10-pin (3mm) MSOP APPLICATIONS 1Mbps SONET The is a high speed current switch for driving a semiconductor laser diode in optical transmission applications. The modulation current (I OUT ) is controlled by the current (I RSET ) through the external resistor R SET. The output OUT is HIGH and no current flows through OUT when output enable is HIGH. The device incorporates complementary open collector outputs with 2mA maximum current driving capability. The external resistor R EXT must be placed between /OUT and V CC to dissipate the worst case power. R SER is recommended to compensate for laser diode matching issues. The utilizes the high performance bipolar ASSET technology. FUNCTIONAL BLOCK DIAGRAM V CC R EXT /OUT OUT R SER DIN /DIN Internal Logic I MOD to Laser Diode /EN 40X V CC GND V EE V REF R SET R SET ASSET is a trademark of Micrel, Inc. 1 Rev.: A Amendment: /0 Issue Date: March 2003
2 PACKAGE/ORDERING INFORMATION /EN DIN /DIN VREF RSET Pin MSOP (K10-1) 10 VCC 9 OUT 8 /OUT 7 GND 6 GND Ordering Information Package Operating Package Part Number Type Range Marking KC K10-1 Commercial 802 KCTR* K10-1 Commercial 802 KI K10-1 Industrial 802 KITR* K10-1 Industrial 802 *Tape and Reel PIN DESCRIPTION Pin Number Pin Name Pin Function 1 /EN 100k PECL compatible input w/ 7kΩ pulldown resistor. Modulation current goes to zero when deasserted high. 2, 3 DIN, /DIN Differential 100k PECL compatible input w/ 7kΩ pulldown resistors. 4 VREF Voltage reference for use with R SET. RSET An external resistor connected from here to V REF sets the reference current for I OUT. 6, 7 GND Device ground. 9, 8 OUT, /OUT Differential open collector current outputs. 10 VCC Positive power supply. TRUTH TABLE (Note 1) D /D /EN OUT (Note 2) /OUT L H L H L H L L L H X X H H L Note 1. L = LOW, H = HIGH, X = don't care. Note 2. H = I OUT = 0mA. 2
3 Absolute Maximum Ratings (Note 1) Power Supply Voltage (V CC )... 0V to +7.0V Input Voltage (V IN )... 0V to V CC Output Current (I OUT )... 2mA Power Dissipation (P TOT )... 20mW Storage Temperature Range (T S )... C to +12 C Operating Ratings (Notes 2, 3, 4) Supply Voltage (V CC ) V to +.V Ambient Temperature (T A ), Note C to +8 C Junction Temperature (T J ), Note C to 100 C Resistor to Dissipate Power (R EXT )...10Ω to 0Ω Laser Diode Serial Resistor (R SER )...0Ω to 0Ω Resistor to Adjust Current (R SET )...100Ω to 0,000Ω Package Thermal Resistance MSOP (θ JA ) Still-Air C/W (ψ JB ) Still-Air C/W Note 1. Note 2. Note 3. Note 4. Note. Permanent device damage may occur if ABSOLUTE MAXIMUM RATINGS are exceeded. This is a stress rating only and functional operation is not implied at conditions other than those detailed in the operational sections of this data sheet. Exposure to ABSOLUTE MAXIMUM RATlNG conditions for extended periods may affect device reliability. The data sheet limits are not guaranteed if the device is operated beyond the operating ratings. The device is guaranteed to meet the DC specifications, shown in the table above, after thermal equilibrium has been established. The device is tested in a socket such that transverse airflow of 00lfpm is maintained. The voltage drop across R EXT and R SER plus Laser Diode must not be greater than 2.3V. Commercial devices are guaranteed from 0 C to +8 C ambient temperature. DC ELECTRICAL CHARACTERISTICS (Note 1) GND = 0V; V CC = V ±10%; T A = 40 C to +8 C Symbol Parameter Condition Min Typ Max Units V IH Input HIGH Voltage V CC 1.16 V CC V V IL Input LOW Voltage V CC V CC 1.47 V V REF Reference Voltage 3.00 V I IL Input LOW Current V IN = V IL (min) 0. µa I IH Input HIGH Current 100 µa I CC Supply Current I MOD = 2mA 16 2 ma I OUT_OFF Output LOW Current 00 µa (/EN = HIGH) I OUT Modulation Current 1 2 ma A RSET I OUT /I RSET V OUT Voltage at OUT, /OUT V CC 2.3 V CC V C OUT Capacitance on OUT, /OUT 2. pf Note 1. Specification for packaged product only. 3
4 AC ELECTRICAL CHARACTERISTICS (Note 1, 2) GND = 0V; V CC = V ±10%; T A = 40 C to +8 C Symbol Parameter Condition Min Typ Max Units t PHL, t PLH D Propagation Delay I OUT = 10mA 1000 ps D IN OUT t PHL, t PLH EN Propagation Delay I OUT = 10mA 1000 ps /EN OUT t r, t f Rise/Fall Time 1000 ps (20% to 80%) I OR Output Current Ringing I OUT = to 2mA 10 % Note 1. Specification for packaged product only. Note 2. R EXT = R SER = 0Ω ±1%; R SER connected directly to V CC. TYPICAL OPERATING CHARACTERISTICS 30 IMOD vs. RSET 2 20 IMOD (ma) K 4.0K 6.0K 8.0K 10K RSET (W) 12K 4
5 10 LEAD MSOP (K10-1) Rev. 00 MICREL, INC FORTUNE DRIVE SAN JOSE, CA 9131 USA TEL + 1 (408) FAX + 1 (408) WEB The information furnished by Micrel in this datasheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser s use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale Micrel, Incorporated.
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