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ADN8831ACPZ-REEL7

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21
Thermoelectric Cooler (TEC) Controller
Data Sheet
ADN8831
Rev. A
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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. Specifications subject to change without notice. No
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Fax: 781.461.3113 ©2005–2012 Analog Devices, Inc. All rights reserved.
FEATURES
Two integrated zero drift, rail-to-rail, chop 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
Optional internal or external clock source
Clock phase adjustment for multiple drop operation
Supports negative temperature coefficient (NTC) thermistors
or positive temperature coefficient (PTC) resistance
thermal detectors (RTDs)
5 V typical and optional 3 V supplies
Standby and shutdown mode availability
Adjustable soft start feature
5 mm × 5 mm 32-lead LFCSP
APPLICATIONS
Thermoelectric cooler (TEC) temperature control
DWDM optical transceiver modules
Optical fiber amplifiers
Optical networking systems
Instruments requiring TEC temperature control
GENERAL DESCRIPTION
The ADN8831 is a monolithic TEC controller. It has two inte-
grated, zero drift, rail-to-rail comparators, and a PWM driver.
A unique PWM driver works with an analog driver to control
external selected MOSFETs in an H-bridge. By sensing the
thermal detector feedback from the TEC, the ADN8831 can
drive a TEC to settle the programmable temperature of a laser
diode or a passive component attached to the TEC module.
The ADN8831 supports NTC thermistors or positive tempera-
ture coefficient (PTC) RTDs. The target temperature is set as an
analog voltage input either from a DAC or from an external
resistor divider driven by a reference voltage source.
A proportional integral differential (PID) compensation
network helps to quickly and accurately stabilize the ADN8831
thermal control loop. An adjustable PID compensation network
example 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 for TEC voltage/current measuring and
limiting in both cooling and heating modes.
FUNCTIONAL BLOCK DIAGRAM
AMPLIFIER
Chop2
AMPLIFIER
Chop1
IN1P
IN1N
OUT1
IN2P
IN2N
OUT2
LIMITER/MONITOR
REF
SOFT START
SHUTDOWN
OSCILLATOR
TMPGD VREF SS/SB PHASE FREQ
SYNCI/SD
LINEAR
MOSFET
DRIVER
PWM
MOSFET
DRIVER
LFB
LPGATE
LNGATE
SFB
SPGATE
SNGATE
COMPSW
SW
COMPOSC
SYNCO
CONTROL
ILIMC ILIM
H ITEC VLIM VTEC CS
04663-001
Figure 1.
ADN8831* PRODUCT PAGE QUICK LINKS
Last Content Update: 02/23/2017
COMPARABLE PARTS
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EVALUATION KITS
• ADN8831 Evaluation Board
DOCUMENTATION
Application Notes
• AN-695: Using the ADN8831 TEC Controller Evaluation
Board
Data Sheet
• ADN8831: Thermoelectric Cooler (TEC) Controller Data
Sheet
DESIGN RESOURCES
• ADN8831 Material Declaration
• PCN-PDN Information
• Quality And Reliability
• Symbols and Footprints
DISCUSSIONS
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SAMPLE AND BUY
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TECHNICAL SUPPORT
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number.
DOCUMENT FEEDBACK
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ADN8831 Data Sheet
Rev. A | Page 2 of 20
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Detailed Block Diagram .................................................................. 3
Specifications ..................................................................................... 4
Electrical Characteristics ............................................................. 4
Absolute Maximum Ratings ............................................................ 6
Thermal Characteristics .............................................................. 6
ESD Caution .................................................................................. 6
Pin Configuration and Function Descriptions ............................. 7
Typical Performance Characteristics ............................................. 9
Theory of Operation ...................................................................... 11
Oscillator Clock Frequency ....................................................... 12
Oscillator Clock Phase ............................................................... 12
Temperature Lock Indicator ..................................................... 13
Soft Start on Power-Up .............................................................. 13
Shutdown Mode ......................................................................... 13
Standby Mode ............................................................................. 13
TEC Voltage/Current Monitor ................................................. 13
Maximum TEC Voltage Limit .................................................. 13
Maximum TEC Current Limit ................................................. 14
Applications Information .............................................................. 15
Signal Flow .................................................................................. 15
Thermistor Setup ........................................................................ 15
Thermistor Amplifier (Chop1) ................................................ 15
PID Compensation Amplifier (Chop2) .................................. 16
MOSFET Driver Amplifier ....................................................... 17
Outline Dimensions ....................................................................... 18
Ordering Guide .......................................................................... 18
REVISION HISTORY
8/12—Rev. 0 to Rev. A
Changes to Features and General Description Sections .............. 1
Moved Figure 2 ................................
................................................. 3
Changes to Figure 2 .......................................................................... 3
Changes to Table 1 ............................................................................ 4
Changes to Table 2 and Table 3 ....................................................... 6
Changes to Figure 3 and Table 4 ..................................................... 7
Changes to Theory of Operation Section and Figure 12 ........... 11
Changes to Figure 14 and Figure 15 ............................................. 11
Changes to Oscillator Clock Frequency Section and Oscillator
Clock Phase Section ....................................................................... 12
Changes to Soft Start on Power-Up Section, Shutdown Mode
Section, Standby Mode Section, and TEC Voltage/Current
Monitor Section .............................................................................. 13
Changes to Figure 17 ...................................................................... 15
Changes to PID Compensation Amplifier (Chop2) Section .... 16
Changes to MOSFET Driver Amplifier Section and Figure 21 .. 17
Updated Outline Dimensions ....................................................... 18
Changes to Ordering Guide .......................................................... 18
9/05—Revision 0: Initial Version
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21

ADN8831ACPZ-REEL7

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Description:
Laser Drivers HIGH PRECISION/EFFICIENCY TEC CONTROLLER
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