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The ADN8831 is a monolithic TEC controller. It has two interface gratings, zero-drift, rail-to-rail comparators and PWM drivers. A unique PWM driver is used in conjunction with an analog driver to control externally selected MOSFETs in the H-bridge. By sensing thermal detector feedback from the TEC, the TEC can be driven to stabilize the laser's programmable temperature diodes or passive components connected to the TEC module. Supports NTC thermistors or positive temperature coefficient (PTC) RTDs. The target temperature is set to an analog voltage input from the DAC or an external resistor divider driven by a reference voltage source. A proportional-integral-derivative (PID) compensation network helps stabilize the ADN8831 thermal control loop quickly and accurately. An example of a tunable PID compensation network is described in the AN-695 application note, using the ADN8831 TEC controller evaluation board.

A typical reference voltage of 2.5 V is available from the ADN8831 for thermistor temperature sensing or TEC voltage/current measurement and limiting cooling and heating modes.

feature

Two integrated zero-drift, rail-to-rail, chopper 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

Selectable internal or external clock source

Clock Phase Adjustment for Multipoint Operation

Supports negative temperature coefficient (NTC) thermistors

or positive temperature coefficient (PTC) resistors

Thermal Detector (RTD)

5 V typical and optional 3 V power supply

Standby and Off Mode Availability

Adjustable soft-start function

5 mm × 5 mm 32-pin LFCSP

application

Thermoelectric Cooler (TEC) Temperature Control

DWDM optical transceiver module

optical fiber amplifier

Optical network system

Instruments requiring TEC temperature control

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