ADN8831 Datasheet PDF - Analog Devices

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ADN8831
Analog Devices

Part Number ADN8831
Description Thermoelectric Cooler (TEC) Controller
Page 21 Pages


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Data Sheet
Thermoelectric Cooler (TEC) Controller
ADN8831
FEATURES
GENERAL DESCRIPTION
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
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
ILIMC ILIMH ITEC VLIM VTEC CS
IN1P
IN1N
AMPLIFIER
Chop1
OUT1
IN2P
IN2N
AMPLIFIER
Chop2
OUT2
LIMITER/MONITOR
CONTROL
REF
SOFT START
SHUTDOWN
LINEAR
MOSFET
DRIVER
PWM
MOSFET
DRIVER
OSCILLATOR
LFB
LPGATE
LNGATE
SFB
SPGATE
SNGATE
COMPSW
SW
COMPOSC
SYNCO
TMPGD VREF
SS/SB
Figure 1.
SYNCI/SD PHASE FREQ
Rev. A
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Tel: 781.329.4700
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Fax: 781.461.3113 ©2005–2012 Analog Devices, Inc. All rights reserved.



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ADN8831* Product Page Quick Links
Last Content Update: 08/30/2016
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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Technical Support
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* This page was dynamically generated by Analog Devices, Inc. and inserted into this data sheet. Note: Dynamic changes to
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ADN8831
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
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
Data Sheet
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
Rev. A | Page 2 of 20



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Data Sheet
ADN8831
DETAILED BLOCK DIAGRAM
ILIMH VLIM
32 31
ADN8831
VTEC
30
ITEC
29
CS
28
ILIMC 1
IN1P 2
IN1N 3
OUT1 4
Chop1
5kΩ
5kΩ
1.25V
25kΩ
1.25V
20kΩ
20kΩ
1kΩ
VOLTAGE
LIMIT
SFB
LFB
1.25V
20kΩ
20kΩ
VC
25kΩ
1kΩ
VB
20kΩ
IN2P 5
IN2N 6
Chop2
10kΩ
20kΩ
20kΩ
20kΩ 100kΩ
ILIMH
LFB
OUT2 7
VB
2kΩ
VC
VB
100kΩ
gm1
gm2
LFB LNGATE LPGATE
27 26
25
80kΩ
LINEAR AMPLIFIER
24 COMPSW
23 SFB
22 PGND
21 SNGATE
20 SW
VB
= 2.5V, VDD > 4.0V
= 1.5V, VDD < 4.0V
2.5V
VB
VREF 8
REFERENCE
1.25V
TEMPERATURE
GOOD
ILIMC
ITEC
gm3
SOFT START
250mV
SB
OSCILLATOR
19 SPGATE
18 PVDD
17 COMPOSC
SD
SD
DETECT
9
AVDD
10
PHASE
11 12
TMPGD
AGND
Figure 2. Detailed Block Diagram
13 14 15
FREQ SS/SB SYNCO
16
SYNCI/SD
Rev. A | Page 3 of 20



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