Overview
The AD22105AR-REEL, produced by Analog Devices Inc., is a low-voltage, resistor-programmable thermostatic switch. This solid-state device is designed to switch accurately at any temperature within a wide operating range of −40°C to +150°C. It requires only one external programming resistor to set the desired temperature setpoint. The AD22105 is particularly suited for battery-powered applications and industrial control systems due to its low power dissipation and single power supply voltage operation from 2.7 V to 7.0 V.
Key Specifications
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Temperature Accuracy | ACC | ±0.5 | ±2.0 | °C | |
| Temperature Setpoint Accuracy | ACCT | -40°C ≤ TA ≤ +125°C | ±3.0 | °C | |
| Power Supply Rejection | PSR | 2.7 V < VS < 7.0 V | ±0.05 | ±0.15 | °C/V |
| Hysteresis | HYS | 4.1 | °C | ||
| Open-Collector Output Low Voltage | VOL | 250 | 400 | mV | |
| 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 low power dissipation (230 µW at 3.3 V), which minimizes self-heating errors and maximizes battery life.
- Single Power Supply Voltage: The device can operate on a single power supply voltage from 2.7 V to 7.0 V, facilitating use in both battery-powered and industrial control systems.
- Internal Pull-Up Resistor: An optional internal 200 kΩ pull-up resistor is included to drive light loads such as CMOS inputs or low power LEDs.
- Hysteresis: The device has approximately 4°C of hysteresis to prevent rapid thermal on and off cycling.
Applications
- Battery-Powered Devices: The low power consumption makes it ideal for handheld and portable electronic equipment.
- Industrial Control Systems: Suitable for use in industrial environments due to its robust temperature range and low power operation.
- Automotive Systems: Can be used in automotive applications where temperature monitoring and control are critical.
- Medical Devices: Applicable in medical equipment where precise temperature control is necessary.
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 temperature setpoint programmed in the AD22105?
The temperature setpoint is programmed using a single external resistor.
- What is the power supply voltage range for the AD22105?
The device operates on a single power supply voltage from 2.7 V to 7.0 V.
- What is the hysteresis of the AD22105?
The AD22105 has approximately 4°C of hysteresis.
- Can the AD22105 drive light loads directly?
Yes, it includes an optional internal 200 kΩ pull-up resistor to drive light loads such as CMOS inputs or low power LEDs.
- What is the typical supply current of the AD22105?
The typical supply current is 120 µA when the output is low and 90 µA when the output is high.
- Is the AD22105 suitable for battery-powered applications?
Yes, due to its low power dissipation, it is suitable for battery-powered devices.
- What is the turn-on settling time of the AD22105?
The turn-on settling time is approximately 5 µs.
- Can the AD22105 be used in industrial control systems?
Yes, it is suitable for use in industrial control systems due to its robust temperature range and low power operation.
- Is the AD22105 RoHS compliant?
Yes, the AD22105 is RoHS compliant.
