ADN8831ACP Datasheet, PDF (1/20 Pages) Analog Devices – Thermoelectric Cooler (TEC) Controller

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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