ADN8834ACPZ-R7

The ADN8834 is a monolithic TEC controller integrating a TEC controller. It features a linear power stage, a PWM power stage, and two zero-drift, rail-to-rail op-amps. The linear controller works in conjunction with the PWM driver to control internal power MOSFETs in an H-bridge configuration. By measuring the feedback voltage from a thermal sensor and using the integrated op-amps as a PID compensator to condition the signal, the ADN8834 drives current through the TEC to bring the temperature of a laser diode or passive component connected to the TEC module to a preset target temperature. The ADN8834 supports NTC thermistors as well as PTC RTDs. The target temperature can be set via an analog voltage input from a DAC or an external resistor voltage divider. The ADN8834's temperature control loop is stabilized through PID compensation using built-in zero-drift chopper amplifiers. An internal 2.50 V reference provides 1% accuracy output for biasing the thermistor temperature sensing bridge and voltage divider network, enabling programmable maximum TEC current and voltage limits in both heating and cooling modes. Through the zero-drift chopper amplifiers, the autonomous analog temperature control loop maintains excellent long-term temperature stability.

Applications

• TEC temperature control
• Optical modules
• Fiber amplifiers
• Optical network systems
• Instruments requiring TEC temperature control

Key features

• Patented high efficiency single-inductor architecture
• Integrated low R_{DS_ON} MOSFETs for 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 switching frequency
• External synchronization
• Two integrated zero-drift rail-to-rail chopper amplifiers
• Supports NTC or RTD temperature sensors
• 2.50 V reference output with 1% accuracy
• Temperature lock indication
• Available in 25-ball, 2.5 mm x 2.5 mm WLCSP or 24-lead, 4 mm x 4 mm LFCSP packages