Overview
The ADN8835ACPZ-R2, produced by Analog Devices Inc., is a monolithic Thermoelectric Cooler (TEC) controller integrated into a single chip. This device is designed to control and stabilize the temperature of components such as laser diodes or passive components attached to a TEC module. It features a linear power stage, a pulse-width modulation (PWM) power stage, and two zero-drift, rail-to-rail chopper amplifiers. The ADN8835 works by measuring thermal sensor feedback voltage and using integrated operational amplifiers as a proportional integral differential (PID) compensator to condition the signal, thereby driving current through the TEC to achieve the programmed target temperature.
Key Specifications
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Driver Supply Voltage | VPVIN | 2.7 | 5.5 | V | |
| Controller Supply Voltage | VVDD | 2.7 | 5.5 | V | |
| Supply Current | IVDD | 3.3 | 5 | mA | |
| Shutdown Current | 350 | µA | |||
| Operating Temperature | -40 | 125 | °C | ||
| PWM Driver Switching Frequency | fOSC | 1.85 | 2.0 | 2.15 | MHz |
| P-MOSFET RDS_ON | 60 | 85 | mΩ | ||
| N-MOSFET RDS_ON | 45 | 85 | mΩ | ||
| Package Style | 36-lead LFCSP |
Key Features
- High efficiency single inductor architecture, no external sense resistor required
- Integrated low RDSON MOSFETs for the TEC controller
- TEC voltage and current operation monitoring, temperature lock indicator
- Independent TEC heating and cooling current-limit settings
- External synchronization, two integrated, zero-drift, rail-to-rail chopper amplifiers
- Compatible with NTC or RTD thermal sensors, 2.50V reference output with 1% accuracy
- PWM driver switching frequency is 2MHz typical at (EN/SY high, VIN = 2.7V to 5.5V)
Applications
- TEC temperature control
- Optical modules
- Optical fiber amplifiers
- Optical networking systems
- Instruments requiring TEC temperature control
Q & A
- What is the primary function of the ADN8835?
The ADN8835 is a monolithic TEC controller designed to control and stabilize the temperature of components such as laser diodes or passive components attached to a TEC module.
- What types of thermal sensors does the ADN8835 support?
The ADN8835 supports negative temperature coefficient (NTC) thermistors as well as positive temperature coefficient (PTC) resistive temperature detectors (RTDs).
- What is the typical PWM driver switching frequency of the ADN8835?
The PWM driver switching frequency is 2MHz typical at (EN/SY high, VIN = 2.7V to 5.5V).
- What is the operating temperature range of the ADN8835?
The operating temperature range is -40°C to +125°C.
- What package style is the ADN8835 available in?
The ADN8835 is available in a 36-lead, 6 mm × 6 mm LFCSP package.
- Does the ADN8835 require an external sense resistor?
No, the ADN8835 does not require an external sense resistor due to its high efficiency single inductor architecture.
- What is the supply current of the ADN8835?
The supply current is 3.3mA typical at (VIN = 2.7V to 5.5V).
- What is the shutdown current of the ADN8835?
The shutdown current is 350µA typical at (VIN = 2.7V to 5.5V).
- Can the ADN8835 be used in optical networking systems?
Yes, the ADN8835 can be used in optical networking systems, among other applications such as optical modules and optical fiber amplifiers.
- How does the ADN8835 control the temperature of the TEC module?
The ADN8835 controls the temperature by measuring thermal sensor feedback voltage and using integrated operational amplifiers as a PID compensator to condition the signal, thereby driving current through the TEC to achieve the programmed target temperature.
