ADN8834 Datasheet | Analog Devices

Data Sheet Ultrapact, 1.5 A Thermoelectric Cooler (TEC) Controller ADN8834 Features Patented high efficiency single inductor architecture Integrated low RDSON MOSFETs for the TEC controller TEC voltage and current operation monitoring No external sense resistor required Independent TEC heating and cooling current limit settings Programmable maximum TEC voltage 2.0 MHz PWM driver switching frequency External synchronization Two integrated, zero drift, rail-to-rail chopper amplifiers Capable of NTC or RTD thermal sensors 2.50 V reference output with 1% accuracy Temperature lock indicator Available in a 25-ball, 2.5 mm × 2.5 mm WLCSP or in a 24-lead, 4 mm × 4 mm LFCSP APPLICATIONS TEC temperature control Optical modules Optical fiber amplifiers Optical networking systems Instruments requiring TEC temperature control GENERAL DESCRIPTION The ADN8834 is a monolithic TEC controller with an integrated TEC controller. It has a linear power stage, a pulse-width modulation (PWM) power stage, and two zero-drift, rail-to-rail operational amplifiers. The linear controller works with the PWM driver to control the internal power MOSFETs in an H-bridge configuration. By measuring the thermal sensor feedback voltage and using the integrated operational amplifiers as a proportional integral differential (PID) pensator to condition the signal, the ADN8834 drives current through a TEC to settle the temperature of a laser diode or a passive ponent attached to the TEC module to the programmed target temperature. The ADN8834 supports negative temperature coefficient (NTC) thermistors as well as positive temperature coefficient (PTC) resistive temperature detectors (RTD). The target temperature is set as an analog voltage input either from a digital-to-analog converter (DAC) or from an external resistor divider. IN1P IN1N OUT1 IN2P IN2N OUT2 FUNCTIONAL BLOCK DIAGRAM VLIM/ VDD SD ILIM VTEC ITEC PVIN ERROR AMP TEC CURRENT AND VOLTAGE SENSE AND LIMIT P...