AD7847AN

Product Overview

Category: Integrated Circuit (IC)

Use: The AD7847AN is a high-performance, 12-bit successive approximation analog-to-digital converter (ADC). It is designed for various applications that require accurate and fast conversion of analog signals into digital data.

Characteristics: - High resolution: 12-bit ADC - Successive approximation architecture - Fast conversion time - Low power consumption - Wide input voltage range - On-chip track-and-hold circuitry - Serial interface for easy integration with microcontrollers

Package: The AD7847AN is available in a 28-pin plastic dual in-line package (DIP), which provides ease of handling and compatibility with standard PCB designs.

Essence: The essence of the AD7847AN lies in its ability to convert analog signals into digital data with high accuracy and speed. This makes it an essential component in many electronic systems that require precise measurement and control.

Packaging/Quantity: The AD7847AN is typically sold in reels or tubes, containing a specific quantity of ICs per package. The exact packaging and quantity may vary depending on the supplier.

Specifications

• Resolution: 12 bits
• Conversion Time: 1.5 µs (typical)
• Input Voltage Range: 0V to Vref
• Supply Voltage: 2.7V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Interface: Serial (SPI-compatible)

Detailed Pin Configuration

The AD7847AN has a total of 28 pins, each serving a specific function. Here is a detailed pin configuration:

1. VDD: Power supply voltage
2. VREF: Reference voltage input
3. AGND: Analog ground
4. REFOUT: Reference voltage output
5. DGND: Digital ground
6. DB11-DB0: Data bus (12-bit digital output)
7. CS: Chip select input
8. SCLK: Serial clock input
9. SDIN: Serial data input
10. SDOUT: Serial data output
11. RD: Read control input
12. WR: Write control input
13. A0-A3: Address inputs 14-28. NC: No connection

Functional Features

1. High Resolution: The 12-bit resolution allows for precise conversion of analog signals into digital data, providing accurate measurements.
2. Fast Conversion Time: With a typical conversion time of 1.5 µs, the AD7847AN can quickly process analog signals, making it suitable for real-time applications.
3. Low Power Consumption: The IC is designed to operate with low power consumption, making it energy-efficient and suitable for battery-powered devices.
4. Wide Input Voltage Range: The AD7847AN can handle a wide range of input voltages, allowing for versatile use in various applications.
5. On-Chip Track-and-Hold Circuitry: The built-in track-and-hold circuit ensures accurate sampling of analog signals during the conversion process.
6. Serial Interface: The serial interface simplifies integration with microcontrollers, enabling easy communication and control.

Advantages and Disadvantages

Advantages: - High resolution for accurate measurements - Fast conversion time for real-time applications - Low power consumption for energy efficiency - Wide input voltage range for versatility - Easy integration with microcontrollers

Disadvantages: - Limited number of available pins for other functionalities - Requires external reference voltage for proper operation

Working Principles

The AD7847AN operates based on the successive approximation architecture. It uses an internal digital-to-analog converter (DAC) and a comparator to perform the conversion process. The analog input signal is compared to the DAC output, and the successive approximation algorithm is used to determine the digital representation of the analog signal. This process is repeated for each bit until the full 12-bit conversion is complete.

Detailed Application Field Plans

The AD7847AN finds applications in various fields that require accurate analog-to-digital conversion. Some of the potential application areas include: - Industrial automation - Data acquisition systems - Instrumentation and measurement equipment - Medical devices - Audio processing systems - Robotics

Detailed and Complete Alternative Models

1. AD7887: 12-bit ADC with higher sampling rate
2. AD7797: 16-bit ADC with lower power consumption
3. ADS124S08: 24-bit ADC with integrated programmable gain amplifier (PGA)
4. MCP3208: 12-bit ADC with SPI interface
5. MAX11100: 16-bit ADC with internal reference voltage

These alternative models offer different features and specifications, allowing users to choose the most suitable option based on their specific requirements.

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