Overview
The AD7818ARM, produced by Analog Devices Inc., is a 10-bit, single- and 4-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 AD7818ARM features a successive-approximation converter based on a capacitor digital-to-analog converter (DAC), an on-chip clock oscillator, inherent track-and-hold functionality, and an on-chip reference voltage of 2.5 V. The temperature sensor provides accurate measurements with a resolution of ±0.25°C and an accuracy of ±2°C over the temperature range of –55°C to +125°C.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Resolution | Number of bits | 10 bits |
| Number of Channels | Number of analog input channels | 4 channels |
| Conversion Time | Time for a single conversion | 9 μs |
| Power Supply | Operating voltage range | 2.7 V to 5.5 V |
| Temperature Sensor Accuracy | Accuracy of the on-chip temperature sensor | ±2°C |
| Operating Temperature Range | Temperature range for operation | –55°C to +125°C |
| Package Type | Physical package of the device | 8-lead MSOP (Micro Small Outline Package) |
| Power Consumption | Power consumption at different throughput rates | 40 μW at 1 kSPS, 400 μW at 10 kSPS |
| Serial Interface | Type of serial interface | Compatible with Intel 8051, Motorola SPI, and National Semiconductors MICROWIRE protocols |
Key Features
- On-Chip Temperature Sensor: Provides accurate temperature measurements with a resolution of ±0.25°C and an accuracy of ±2°C over the range of –55°C to +125°C.
- Successive-Approximation Converter: Based on a capacitor DAC, ensuring fast conversion times of 9 μs.
- Inherent Track-and-Hold Functionality: Ensures accurate sampling of the analog input signal.
- On-Chip Clock Oscillator and Reference: Includes a 2.5 V on-chip reference voltage, reducing the need for external components.
- Automatic Power-Down: Reduces power consumption to 40 μW at slower throughput rates, enhancing power efficiency.
- Flexible Serial Interface: Compatible with various microcontroller protocols, including Intel 8051, Motorola SPI, and National Semiconductors MICROWIRE.
- Overtemperature Indicator: Alerts when a predetermined temperature is exceeded, useful for thermal monitoring and control.
Applications
- Ambient Temperature Monitoring: Ideal for monitoring ambient temperatures in various environments.
- Thermostat and Fan Control: Used in temperature control systems to regulate temperature and control fans.
- High-Speed Microprocessor Temperature Measurement and Control: Suitable for monitoring and controlling temperatures in high-speed microprocessor applications.
- Data Acquisition Systems: Integrates well into data acquisition systems that require ambient temperature monitoring.
- Industrial Process Control: Used in industrial settings for temperature monitoring and control.
- Automotive Battery Charging Applications: Can be used in automotive systems to monitor and control battery charging temperatures.
Q & A
- What is the resolution of the AD7818ARM ADC?
The AD7818ARM has a resolution of 10 bits.
- How many analog input channels does the AD7818ARM have?
The AD7818ARM has 4 analog input channels.
- What is the conversion time for the AD7818ARM?
The conversion time for the AD7818ARM is 9 μs.
- What is the operating voltage range of the AD7818ARM?
The AD7818ARM operates from a single power supply ranging from 2.7 V to 5.5 V.
- What is the accuracy of the on-chip temperature sensor?
The on-chip temperature sensor has an accuracy of ±2°C.
- What is the operating temperature range of the AD7818ARM?
The AD7818ARM operates over a temperature range of –55°C to +125°C.
- What type of package does the AD7818ARM come in?
The AD7818ARM comes in an 8-lead MSOP (Micro Small Outline Package).
- How much power does the AD7818ARM consume at different throughput rates?
The AD7818ARM consumes 40 μW at 1 kSPS and 400 μW at 10 kSPS.
- What serial interface protocols is the AD7818ARM compatible with?
The AD7818ARM is compatible with Intel 8051, Motorola SPI, and National Semiconductors MICROWIRE protocols.
- Does the AD7818ARM have an overtemperature indicator?
Yes, the AD7818ARM has an overtemperature indicator that alerts when a predetermined temperature is exceeded.
