Features and Benefits
- 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
The ADN88311 is 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.
- Thermoelectric cooler (TEC) temperature control
- DWDM optical transceiver modules
- Optical fiber amplifiers
- Optical networking systems
- Instruments requiring TEC temperature control
1 Product is covered by U.S. Patent No. 6,486,643
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At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
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