Overview
The AD22105AR-REEL7, produced by Analog Devices Inc., is a solid-state thermostatic switch designed for precise temperature monitoring and control. This component requires only one external programming resistor to set the switch point accurately within a wide operating temperature range of −40°C to +150°C. The AD22105 is particularly useful in applications where low power consumption and high accuracy are crucial, such as in battery-powered devices and industrial control systems.
Key Specifications
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Temperature Setpoint Accuracy | ACCT | −3.0 | °C | ||
| Power Supply Rejection | PSR | ±0.05 | ±0.15 | °C/V | |
| Hysteresis | HYS | 4.1 | °C | ||
| Supply Voltage Range | VS | 2.7 | 7.0 | V | |
| Supply Current (Output Low) | ISON | 120 | µA | ||
| Supply Current (Output High) | ISOFF | 90 | µA | ||
| Internal Pull-Up Resistor | RPULL-UP | 140 | 200 | 260 | kΩ |
| Turn-On Settling Time | tON | 5 | µs |
Key Features
- Wide Operating Range: The AD22105 operates over a temperature range of −40°C to +150°C, making it versatile for various applications.
- Low Power Consumption: It operates with a low power supply voltage from 2.7 V to 7.0 V and has a low supply current, which is beneficial for battery-powered devices.
- Single External Resistor Programming: The setpoint temperature can be programmed using just one external resistor, simplifying the design process.
- Internal Pull-Up Resistor: An optional internal 200 kΩ pull-up resistor is available to drive light loads such as CMOS inputs or low-power LEDs.
- Low Self-Heating: The device has minimal self-heating, which maximizes battery life and reduces errors due to self-heating.
- Hysteresis: The AD22105 includes approximately 4°C of hysteresis to prevent rapid thermal on and off cycling.
Applications
- Handheld and Portable Electronic Equipment: Ideal for temperature monitoring in battery-powered devices.
- Industrial Control Systems: Suitable for use in industrial environments where precise temperature control is necessary.
- Automotive Systems: Can be used in automotive applications requiring reliable temperature monitoring.
- EMI Sensitive Environments: The device can be used in noisy environments with proper EMI suppression techniques.
Q & A
- What is the operating temperature range of the AD22105?
The AD22105 operates over a temperature range of −40°C to +150°C.
- How is the setpoint temperature programmed for the AD22105?
The setpoint temperature can be programmed using a single external resistor.
- What is the power supply voltage range for the AD22105?
The AD22105 operates with a power supply voltage from 2.7 V to 7.0 V.
- Does the AD22105 have an internal pull-up resistor?
Yes, the AD22105 includes an optional internal 200 kΩ pull-up resistor.
- What is the hysteresis of the AD22105?
The AD22105 has approximately 4°C of hysteresis.
- How much power does the AD22105 consume?
The AD22105 has a low power consumption, with a supply current of 120 µA (output low) and 90 µA (output high) at 3.3 V.
- Is the AD22105 RoHS compliant?
Yes, the AD22105 is RoHS compliant.
- What package type is the AD22105 available in?
The AD22105 is available in an 8-Lead Standard Small Outline Package (SOIC_N).
- How does the AD22105 handle EMI in noisy environments?
The AD22105 can be used in noisy environments with proper EMI suppression techniques to prevent false tripping or untripping.
- What are some common applications of the AD22105?
The AD22105 is commonly used in handheld and portable electronic equipment, industrial control systems, and automotive systems.
