REV. C

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties that

may result from its use. No license is granted by implication or otherwise

under any patent or patent rights of Analog Devices. Trademarks and

registered trademarks are the property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

www.analog.com

Fax: 781/326-8703

© 2003 Analog Devices, Inc. All rights reserved.

ADN8830

Thermoelectric Cooler Controller

FEATURES

High Efficiency

Small Size: 5 mm

5 mm LFCSP

Low Noise: <0.5% TEC Current Ripple

Long-Term Temperature Stability:

0.01 C

Temperature Lock Indication

Temperature Monitoring Output

Oscillator Synchronization with an External Signal

Clock Phase Adjustment for Multiple Controllers

Programmable Switching Frequency up to 1 MHz

Thermistor Failure Alarm

Maximum TEC Voltage Programmability

APPLICATIONS

Thermoelectric Cooler (TEC) Temperature Control

Resistive Heating Element Control

Temperature Stabilization Substrate (TSS) Control

FUNCTIONAL BLOCK DIAGRAM

PID COMPENSATION

NETWORK

TEMPERATURE

MEASUREMENT

AMPLIFIER

PWM

CONTROLLER

FROM

THERMISTOR

TEMPERATURE

SET

INPUT

VOLTAGE

REFERENCE

OSCILLATOR

FREQUENCY/PHASE

CONTROL

P-CHANNEL

(UPPER MOSFET)

N-CHANNEL

MOSFET

DRIVERS

P-CHANNEL

(LOWER MOSFET)

N-CHANNEL

GENERAL DESCRIPTION

The ADN8830 is a monolithic controller that drives a thermo-

electric cooler (TEC) to stabilize the temperature of a laser diode

or a passive component used in telecommunications equipment.

This device relies on a negative temperature coefficient (NTC)

thermistor to sense the temperature of the object attached to the

TEC. The target temperature is set with an analog input voltage

either from a DAC or an external resistor divider.

The loop is stabilized by a PID compensation amplifier with

high stability and low noise. The compensation network can be

adjusted by the user to optimize temperature settling time. The

component values for this network can be calculated based on

the thermal transfer function of the laser diode or obtained

from the lookup table given in the Application Notes section.

Voltage outputs are provided to monitor both the temperature of

the object and the voltage across the TEC. A voltage reference

of 2.5 V is also provided.