AD7821BQ

Product Overview

• Category: Integrated Circuit (IC)
• Use: Analog-to-Digital Converter (ADC)
• Characteristics:
  • High-resolution ADC
  • Low power consumption
  • Serial interface
• Package: 24-pin plastic dual in-line package (DIP)
• Essence: Converts analog signals into digital data
• Packaging/Quantity: Available in reels of 250 units

Specifications

• Resolution: 12 bits
• Conversion Time: 2.5 µs
• Input Voltage Range: 0V to Vref
• Power Supply: 5V
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The AD7821BQ has a total of 24 pins, which are assigned as follows:

1. VDD - Power supply voltage
2. VREF - Reference voltage input
3. AGND - Analog ground
4. REFOUT - Reference output voltage
5. IN1 - Analog input channel 1
6. IN2 - Analog input channel 2
7. IN3 - Analog input channel 3
8. IN4 - Analog input channel 4
9. IN5 - Analog input channel 5
10. IN6 - Analog input channel 6
11. IN7 - Analog input channel 7
12. IN8 - Analog input channel 8
13. CS - Chip select input
14. RD - Read control input
15. WR - Write control input
16. D0 - Data bit 0
17. D1 - Data bit 1
18. D2 - Data bit 2
19. D3 - Data bit 3
20. D4 - Data bit 4
21. D5 - Data bit 5
22. D6 - Data bit 6
23. D7 - Data bit 7
24. DGND - Digital ground

Functional Features

• High-resolution conversion: The AD7821BQ provides a 12-bit resolution, allowing for precise analog-to-digital conversion.
• Low power consumption: This ADC is designed to operate with low power requirements, making it suitable for battery-powered applications.
• Serial interface: The device utilizes a serial interface for communication, enabling easy integration with microcontrollers and other digital systems.

Advantages and Disadvantages

Advantages: - High resolution ensures accurate conversion of analog signals. - Low power consumption extends battery life in portable devices. - Serial interface simplifies integration with digital systems.

Disadvantages: - Limited input voltage range may restrict compatibility with certain applications. - Conversion time of 2.5 µs may not be sufficient for high-speed sampling requirements.

Working Principles

The AD7821BQ operates on the principle of successive approximation. It samples the analog input voltage and compares it to a reference voltage. By iteratively adjusting the digital representation of the input voltage, it converges towards an accurate digital representation.

Detailed Application Field Plans

The AD7821BQ is commonly used in various applications, including but not limited to: - Industrial automation - Data acquisition systems - Instrumentation - Medical equipment - Consumer electronics

Alternative Models

Other alternative models that offer similar functionality to the AD7821BQ include: - AD7820: 8-bit resolution ADC with similar features - AD7824: 14-bit resolution ADC with extended input voltage range - AD7829: 12-bit resolution ADC with built-in temperature sensor

These alternative models can be considered based on specific application requirements and desired specifications.

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