ADN8835

RECOMMENDED FOR NEW DESIGNS

Ultracompact, 3 A Thermoelectric Cooler (TEC) Controller

Data Sheet (Rev. B) Product Selection Table

Part Models: 1
1ku List Price: Starting From $8.07

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Overview

High efficiency single inductor architecture
Integrated low R_DSON MOSFETs for the TEC controller
TEC voltage and current operation monitoring
No external sense resistor required
Independent TEC heating and cooling current-limit settings
2.0 MHz (typical) PWM driver switching frequency

External synchronization
Programmable maximum TEC voltage
Two integrated, zero-drift, rail-to-rail chopper amplifiers
Compatible with NTC or RTD thermal sensors
2.50 V reference output with 1% accuracy
Temperature lock indicator
Available in a 36-lead, 6 mm × 6 mm LFCSP

The ADN8835 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 chopper 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 ADN8835 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 ADN8835 supports negative temperature coefficient (NTC) thermistors as well as positive temperature coefficient (PTC) resistive temperature detectors (RTDs). 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 ADN8835 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 biases 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, excellent 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

Part Models: 1
1ku List Price: Starting From $8.07

Documentation

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. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
ADN8835ACPZ-R7	36-Lead LFCSP (6mm x 6mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Evaluation Kits

ADN8835 Evaluation Board

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Features and Benefits

Complete TEC controller with integrated 3 A TEC driver
Operating voltage range: V_IN = 2.7 V to 5.5 V
TEC voltage and current operation monitoring
Independent TEC heating and cooling current-limit settings
Programmable maximum TEC voltage
External synchronization from 1.85 MHz to 3.25 MHz
2.5 V reference output
Input for NTC thermistor connection
Output for TEC module wires
Disable jumper
45 mm × 25 mm evaluation board size

Product Details

The ADN8835CP-EVALZ is a configurable evaluation board designed to work with various TEC modules and thermistors. The ADN8835, which is included on the evaluation board, delivers and controls bidirectional current through a TEC controller using two pairs of the complementary integrated MOSFETs in an H bridge configuration.

The TEC cooling and heating current limits are set to 3 A, and the maximum TEC voltage is programmed to 3.5 V using two on-board resistor dividers. The temperature setpoint circuit is optimized to work with a 10 kΩ negative thermal coefficient (NTC) thermistor. The on-board proportional integral differential (PID) compensation network components can be replaced by soldering different value components that match the temperature control loop characteristics with the thermal load to achieve the required response time and temperature stability. The cooling and heating TEC current limits and maximum TEC voltage setting can also be modified by changing the values of the corresponding components.

In addition, the board can be plugged into the ADN8835 base board, which has adjustable components for the tunable analog thermal PID network, the temperature setpoint, and the maximum TEC current and TEC voltage limits.

Full specifications on the ADN8835 are available in the ADN8835 data sheet, which should be consulted in conjunction with this user guide when working with the evaluation board.