CDRH4D284R7 View Datasheet(PDF) - Analog Devices
Part Name
Description
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CDRH4D284R7 Datasheet PDF : 22 Pages
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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
Thermoelectric Cooler Controller
ADN8830
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.
FROM
THERMISTOR
TEMPERATURE
SET
INPUT
VREF
FUNCTIONAL BLOCK DIAGRAM
PID COMPENSATION
NETWORK
TEMPERATURE
MEASUREMENT
AMPLIFIER
PWM
CONTROLLER
VOLTAGE
REFERENCE
OSCILLATOR
MOSFET
DRIVERS
P-CHANNEL
(UPPER MOSFET)
N-CHANNEL
P-CHANNEL
(LOWER MOSFET)
N-CHANNEL
FREQUENCY/PHASE
CONTROL
REV. D
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