ADN8834

Ultra compact 1.5 A Thermoelectric Cooler (TEC) Controller 



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Product Details

The ADN8834 is a monolithic TEC controller with an integrated TEC controller. It has a linear power stage, a pulse-width modulation (PWM) power stage, and two zero-drift, rail-to-rail operational amplifiers. The linear controller works with the PWM driver to control the internal power MOSFETs in an H-bridge configuration. By measuring the thermal sensor feedback voltage and using the integrated operational amplifiers as a proportional integral differential (PID) compensator to condition the signal, the ADN8834 drives current through a TEC to settle the temperature of a laser diode or a passive component attached to the TEC module to the programmed target temperature.

The ADN8834 supports negative temperature coefficient (NTC) thermistors as well as positive temperature coefficient (PTC) resistive temperature detectors (RTD). The target temperature is set as an analog voltage input either from a digital-to-analog converter (DAC) or from an external resistor divider.

The temperature control loop of the ADN8834 is stabilized by PID compensation utilizing the built in, zero drift chopper amplifiers. The internal 2.50 V reference voltage provides a 1% accurate output that is used to bias a thermistor temperature sensing bridge as well as a voltage divider network to program the maximum TEC current and voltage limits for both the heating and cooling modes. With the zero drift chopper amplifiers, extremely good long-term temperature stability is maintained via an autonomous analog temperature control loop.

Applications
  • TEC temperature control
  • Optical modules
  • Optical fiber amplifiers
  • Optical networking systems
  • Instruments requiring TEC temperature control

Product Lifecycle

checked Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits

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EVAL-ADN8834

EVAL-ADN8834 Circuit Diagram

EVAL-ADN8834 Photo

Product Details

The ADN8834CB-EVALZ and ADN8834CP-EVALZ are configurable evaluation boards designed to work with various TEC modules and thermistors. The ADN8834 on the evaluation board delivers and controls bidirectional current through TEC using two pairs of the complimentary integrated MOSFETs in an H-bridge configuration.


The TEC cooling and heating current limits set to 1.5 A and the maximum TEC voltage is programmed to be 3V respectively using two on-board resistor dividers. The temperature set-point circuit is optimized to work with 10 kΩ NTC thermistor. The PID compensation network components are present onboard and can be replaced by soldering different value components to match the temperature control loop characteristic with the thermal load for achieving the required response time and temperature stability. The cooling and heating TEC current limits and maximum TEC voltage setting can be modified also by changing values of the corresponding components.


In addition, the board can be plugged into the ADN8833/34 Base board that has adjustable components for tunable analog thermal PID, the temperature set point, maximum TEC current and TEC voltage limits.

Reference Materials

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Design Resources

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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

ADN8834 Material Declaration
PCN-PDN Information Quality And Reliability Symbols and Footprints

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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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Evaluation Boards Pricing displayed is based on 1-piece.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.