Datasheet ADN8831 (Analog Devices)

Thermoelectric Cooler (TEC) Controller Data Sheet ADN8831 FEATURES GENERAL DESCRIPTION Two integrated zero drift, rail-to-rail, chop amplifiers
The ADN88311 is a monolithic TEC controller. It has two inte-
TEC voltage and current operation monitoring
grated, zero drift, rail-to-rail comparators, and a PWM driver.
Programmable TEC maximum voltage and current
A unique PWM driver works with an analog driver to control
Programmable TEC current heating and cooling limits
external selected MOSFETs in an H-bridge. By sensing the
Configurable PWM switching frequency up to 1 MHz
thermal detector feedback from the TEC, the ADN8831 can
Power efficiency: > 90%
drive a TEC to settle the programmable temperature of a laser
Temperature lock indication
diode or a passive component attached to the TEC module.
Optional internal or external clock source
The ADN8831 supports NTC thermistors or positive tempera-
Clock phase adjustment for multiple drop operation
ture coefficient (PTC) RTDs. The target temperature is set as an
Supports negative temperature coefficient (NTC) thermistors
analog voltage input either from a DAC or from an external
or positive temperature coefficient (PTC) resistance
resistor divider driven by a reference voltage source.
thermal detectors (RTDs) 5 V typical and optional 3 V supplies
A proportional integral differential (PID) compensation
Standby and shutdown mode availability
network helps to quickly and accurately stabilize the ADN8831
Adjustable soft start feature
thermal control loop. An adjustable PID compensation network
5 mm × 5 mm 32-lead LFCSP
example is described in the AN-695 Application Note, Using the ADN8831 TEC Controller Evaluation Board. A typical reference
APPLICATIONS
voltage of 2.5 V is available from the ADN8831 for thermistor
Thermoelectric cooler (TEC) temperature control
temperature sensing or for TEC voltage/current measuring and
DWDM optical transceiver modules
limiting in both cooling and heating modes.
Optical fiber amplifiers Optical networking systems Instruments requiring TEC temperature control FUNCTIONAL BLOCK DIAGRAM ILIMC ILIMH ITEC VLIM VTEC CS LIMITER/MONITOR LFB IN1P LINEAR AMPLIFIER MOSFET LPGATE Chop1 DRIVER IN1N LNGATE SFB OUT1 SPGATE CONTROL PWM MOSFET SNGATE IN2P DRIVER COMPSW AMPLIFIER Chop2 SW IN2N COMPOSC SOFT START REF OSCILLATOR SHUTDOWN OUT2 SYNCO
001
TMPGD VREF SS/SB SYNCI/SD PHASE FREQ
04663- Figure 1. 1 Product is covered by U.S. Patent No. 6,486,643.
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Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM REVISION HISTORY DETAILED BLOCK DIAGRAM SPECIFICATIONS ELECTRICAL CHARACTERISTICS ABSOLUTE MAXIMUM RATINGS THERMAL CHARACTERISTICS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION OSCILLATOR CLOCK FREQUENCY Free-Run Operation External Clock Operation Connecting Multiple ADN8831 Devices OSCILLATOR CLOCK PHASE TEMPERATURE LOCK INDICATOR SOFT START ON POWER-UP SHUTDOWN MODE STANDBY MODE TEC VOLTAGE/CURRENT MONITOR Voltage Monitor Current Monitor MAXIMUM TEC VOLTAGE LIMIT Using a DAC Using a Resistor Divider MAXIMUM TEC CURRENT LIMIT APPLICATIONS INFORMATION SIGNAL FLOW THERMISTOR SETUP THERMISTOR AMPLIFIER (Chop1) PID COMPENSATION AMPLIFIER (Chop2) MOSFET DRIVER AMPLIFIER OUTLINE DIMENSIONS ORDERING GUIDE