HY6410 Laser Diode Driver High Speed Laser Diode Driver TEC Controllers Features: ✦ ✦ ✦ ✦ ✦ ✦ Single ended ECL input (50Ω) Data rates up to 622Mbps Programmable bias current Adjustable modulation current Patented “backmatching” thermal management Backmatched output allows remote drive through 50Ω line Laser Diode Drivers The HY6410 Laser Diode Driver is a high speed, high current solid-state hybrid laser diode driver. It incorporates a patented technique of “backmatching” which allows remote drive of the laser diode through a 50Ω coaxial transmission line. This technique allows physical and thermal isolation of the laser diode and the driver. The laser diode can be driven through a transmission line without the need for a matched impedance termination. This removes a large source of heat that can be detrimental to high performance laser diode systems. The HY6410 is used in applications that require digital, high speed, current modulation of the laser diode. The HY6410 input is ECL-compatible and is terminated into 50Ω. The HY6410 uses a GaAsFET current switch that drives a laser diode with modulation currents of up to 400mA peak-to-peak. Two programmable current sources allow user selectability of the bias and modulation currents. The pre-bias current is selectable from zero to 40mA.The Modulation current is selectable from zero to 400mA. These selected currents modulate the laser beam at the input frequency. The HY6410 comes in a hermetic metal package. Micro-heaters Figure 1 Figure 2 400 Hot Springs Road, Carson City NV 89706 • (775) 883-0820 • Fax (775) 883-0827 • www.hytek.com • 23 HY6410 Laser Diode Driver Input Specifications Power Inputs –5.2V Supply –12V Supply (–V) RF IN BIAS I MOD I –4.9V to –5.5V @ 115mA max. –9V to –12V @ 420mA max. ECL logic levels, 0–622Mbps 0 to 40mA for input voltage –V to –V + 2V 0 to 400mA for input voltage –V to –V + 1.0V Output Specifications RF OUT Current output into 50Ω transmission line Low Current = BIAS I, High Current = MOD I 10 feet max. –V +5V RF OUT Transmission Line Length REF OUT Environmental Conditions Operating Temperature Storage Temperature –55°C to 100°C (case) –65°C to 150°C Ordering Information Pin Designations Description –5.2V input (–5.2V) Ground (GND) –V Input (–V) Reference Voltage Output (REF OUT) Bias I Adjust (BIAS I) Modulation I Adjust (MOD I) ECL Input Waveform (RF IN) Laser Diode Current Drive (RF OUT) HY6410 Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 SMA 1 SMA 2 Model No. HY6410 Description: 400mA High Speed Laser Diode Driver; metal hermetic package Application: ECL Digital Modulation of Laser Diode Pin Descriptions > –5.2V INPUT: > GROUND: > –V: > REF OUT: > BIAS I: > MOD I: > RF IN: > RF OUT: Power supply input for ECL buffer circuitry. Ground return for –5.2V ECL supply and –V. Power Supply input for Bias and Modulation currents as well as laser diode drive circuitry. Precision reference output, +5V with respect to –V (if –V is –12V, REF OUT would be –7V). Input used to set the Bias current for the laser diode. Maximum bias current occurs when the voltage at the BIAS I input is +2V with respect to the –V input. The voltage at the BIAS I input for a given bias curΩ rent is determined by the equation: V(BIAS I) = –V + (desired bias current) x 40Ω Input used to set the Modulation current for the laser diode. This current is added to the Bias I current which always flows through the laser diode. Maximum modulation current occurs when the voltage at the MOD I input is +0.5V with respect to the –V input. The current set by the MOD I voltage is controlled by the ECL RF input. When the RF input is open or set to an ECL “low” input, only BIAS I current flows through the laser diode. The voltage at the MOD I input for a given modulation current is determined by Ω the equation: V(MOD I) = –V + (desired modulation current) x 2.5Ω SMA connector for single ended ECL input. The input is terminated with an equivalent 50Ω into –2V required by the ECL logic family. This input accepts data rates up to 622Mbps. SMA connector for 50Ω transmission line connected to laser. The patented “backmatching” technique does not require a 50Ω termination at the laser diode end of the transmission line. 24 • 400 Hot Springs Road, Carson City NV 89706 • (775) 883-0820 • Fax (775) 883-0827 • www.hytek.com