HIP9022

• Dual High Speed Laser Driver with Data Rates up to 2.5MHz
• 0.5A to 2A Range of Constant Current Source Controlled to 0.1% Full Scale
• Low Signal Transients with Controlled Constant Current Switching
• Laser Optical Power Controlled to Better than 0.5%
• Thermoelectric Cooler (TEC) Circuit to Control Temperature to within 0.25oC
• Multiplexed Sample/Hold (S/H) Bus Interface
• Serial Diagnostic Bus with Multiplexed Output
• High Current ESD Diodes for Laser Diode Protection

The HIP9022 Dual High Speed Laser Driver is designed to operate with a constant current drain from the power supply.

This current of HIP9022 defines the laser operating power. The current is accurately controlled in the range of 0.5A to 2A to deliver constant optical power from the laser when used with an external Power FET and Power Sense resistor. The operating circuit allows flexibility in choosing driver current levels.

Eight S/H circuits are multiplex bus controlled to provide analog data for the dual laser drivers. The HIP9022 bus is updated during the blanking period of the laser printer scan with a data rate up to 2.5MHz. A "thermo-electric-cooler" control circuit provides temperature control of the laser. Two on-chip ESD diodes protect each laser.

A principle advantage of the HIP9022 Dual High Speed Laser Driver is accomplished by managing the high currents externally with discrete Power FETs and thereby not forcing large switching currents to exist on the same IC substrate with the precision control circuitry.