Overview
The AD7418AR, produced by Analog Devices Inc., is a 10-bit, single-channel Analog-to-Digital Converter (ADC) with an integrated on-chip temperature sensor. This device operates from a single power supply ranging from 2.7 V to 5.5 V, making it versatile for various applications. The AD7418AR features a successive approximation converter, a 5-channel multiplexer, a temperature sensor, a clock oscillator, a track-and-hold circuit, and a reference voltage source. It is particularly useful for applications requiring both analog-to-digital conversion and ambient temperature monitoring.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| Supply Voltage (VDD) | 2.7 | 5.5 | V | ||
| Temperature Sensor Accuracy | ±2.0 | ±3.0 | °C | TA = −25°C to +100°C (VDD = 3 V minimum), TA = −40°C to +125°C (VDD = 3 V minimum) | |
| Resolution | 10 | Bits | |||
| Temperature Conversion Time | 30 | ms | |||
| Update Rate (tR) | 400 | μs | |||
| Supply Current (I2C active) | 1.0 | mA | |||
| Supply Current (I2C inactive) | 0.2 | 1.5 | μA | ||
| Supply Current (Shutdown mode) | 0.2 | 1.5 | μA |
Key Features
- Wide Operating Supply Range: The AD7418AR operates from a single 2.7 V to 5.5 V power supply, enhancing its versatility in various applications.
- I2C-Compatible Serial Interface: Allows for easy communication and integration with other devices on the same bus, supporting up to 8 devices with selectable serial bus addresses.
- On-Chip Temperature Sensor: Enables accurate measurement of ambient device temperature over a range of −40°C to +125°C.
- Automatic Power-Down: Reduces power consumption by automatically powering down at the end of a conversion.
- Internal Reference and External Reference Option: The device can use its internal 2.5 V reference or an external reference source.
- Low Power Consumption: Features low supply current in both active and inactive modes, making it suitable for power-sensitive applications.
Applications
- Data Acquisition with Ambient Temperature Monitoring: Ideal for systems that require simultaneous analog data conversion and temperature monitoring.
- Industrial Process Control: Suitable for monitoring and controlling processes in industrial environments.
- Automotive Applications: Can be used in automotive systems for temperature and analog signal monitoring.
- Battery-Charging Applications: Useful in battery management systems to monitor temperature and other critical parameters.
- Personal Computers and Consumer Electronics: Can be integrated into various consumer electronics for temperature and analog signal monitoring.
Q & A
- What is the operating voltage range of the AD7418AR?
The AD7418AR operates from a single 2.7 V to 5.5 V power supply.
- What is the resolution of the AD7418AR ADC?
The AD7418AR has a 10-bit resolution.
- How accurate is the on-chip temperature sensor of the AD7418AR?
The temperature sensor accuracy is ±2.0°C from −25°C to +100°C and ±3.0°C from −40°C to +125°C.
- What is the update rate of the AD7418AR?
The update rate (tR) is 400 μs.
- Can the AD7418AR use an external reference voltage?
- What is the typical supply current when the I2C interface is active?
The typical supply current when the I2C interface is active is 1.0 mA.
- How many devices can be connected to a single I2C bus?
- What is the conversion time for the temperature sensor?
- What are some typical applications of the AD7418AR?
- How does the automatic power-down feature work?
