ADN8834ACPZ-R7 3A TEC Controller ±2.5°C Stability 2.7-5.5V Supply I2C Interface LFCSP-32 -40°C to +85°C

ADN8834ACPZ-R7 3A TEC Controller ±2.5°C Stability 2.7-5.5V Supply I2C Interface LFCSP-32 -40°C to +85°C

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

► AEC-Q100 qualified for automotive applications

APPLICATIONS

► TEC temperature control

► Optical modules

► Optical fiber amplifiers

► Optical networking systems

► Instruments requiring TEC temperature control

GENERAL DESCRIPTION

The ADN88341 is a monolithic TEC controller with an integrated TEC controller. It has a linear power stage, a pulse-width modula tion (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 differen tial (PID) compensator to condition the signal, the ADN8834 drives current through a TEC to settle the temperature of a laser diode or a passive component attached to the TEC module to the program med target temperature.

The ADN8834 supports negative temperature coefficient (NTC) thermistors as well as positive temperature coefficient (PTC) resis tive 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.

The temperature control loop of the ADN8834 is stabilized by PID compensation utilizing the built in, zero drift chopper amplifiers. The internal 2.50 V reference voltage provides a 1% accurate output  that is used to bias a thermistor temperature sensing bridge as well as a voltage divider network to program the maximum TEC current and voltage limits for both the heating and cooling modes. With the zero drift chopper amplifiers, extremely good long-term temperature stability is maintained via an autonomous analog temperature con trol loop.

INFORMATION

Drawing

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