Catalog
A High Efficiency TEC Controller Solution
Key Features
• Two integrated zero drift, rail-to-rail, chop amplifiers
• TEC voltage and current operation monitoring
• Programmable TEC maximum voltage and current
• Programmable TEC current heating and cooling limits
• Configurable PWM switching frequency up to 1 MHz
• Power efficiency: > 90%
• Temperature lock indication
• Optional internal or external clock source
• Clock phase adjustment for multiple drop operation
• Supports negative temperature coefficient (NTC) thermistors or positive temperature coefficient (PTC) resistance thermal detectors (RTDs)
• 5 V typical and optional 3 V supplies
• Standby and shutdown mode availability
• Adjustable soft start feature
• 5 mm × 5 mm 32-lead LFCSP
Description
AI
The ADN88311is a monolithic TEC controller. It has two integrated, zero drift, rail-to-rail comparators, and a PWM driver. A unique PWM driver works with an analog driver to control external selected MOSFETs in an H-bridge. By sensing the thermal detector feedback from the TEC, the ADN8831 can drive a TEC to settle the programmable temperature of a laser diode or a passive component attached to the TEC module.The ADN8831 supports NTC thermistors or positive temperature coefficient (PTC) RTDs. The target temperature is set as an analog voltage input either from a DAC or from an external resistor divider driven by a reference voltage source.A proportional integral differential (PID) compensation network helps to quickly and accurately stabilize the ADN8831 thermal control loop. An adjustable PID compensation network example is described in the AN-695 Application Note, Using the ADN8831TEC Controller Evaluation Board. A typical reference voltage of 2.5 V is available from the ADN8831 for thermistor temperature sensing or for TEC voltage/current measuring and limiting in both cooling and heating modes.ApplicationsThermoelectric cooler (TEC) temperature controlDWDM optical transceiver modulesOptical fiber amplifiersOptical networking systemsInstruments requiring TEC temperature control1Product is covered by U.S. Patent No. 6,486,643
