AD7821KN

Product Overview

Category

AD7821KN belongs to the category of analog-to-digital converters (ADCs).

Use

The AD7821KN is used to convert analog signals into digital data, making it suitable for various applications that require precise and accurate measurements.

Characteristics

• High resolution: The AD7821KN offers a high-resolution conversion with its 12-bit ADC.
• Fast conversion rate: It provides a fast conversion rate of up to 200 kilosamples per second (ksps).
• Low power consumption: This ADC operates at low power, making it energy-efficient.
• Wide input voltage range: The AD7821KN can handle a wide input voltage range, allowing it to accommodate different signal levels.
• Serial interface: It features a serial interface for easy integration with microcontrollers and other digital systems.

Package

The AD7821KN comes in a standard 20-pin plastic dual inline package (PDIP).

Essence

The essence of the AD7821KN lies in its ability to accurately convert analog signals into digital data, enabling precise measurements and analysis.

Packaging/Quantity

The AD7821KN is typically available in reels or tubes, with a quantity of 25 units per reel/tube.

Specifications

• Resolution: 12 bits
• Conversion Rate: Up to 200 ksps
• Input Voltage Range: 0V to Vref
• Power Supply: +5V
• Operating Temperature Range: -40°C to +85°C
• Interface: Serial

Detailed Pin Configuration

The AD7821KN has a total of 20 pins. Here is the detailed pin configuration:

1. VDD: Power supply positive terminal
2. VREF: Reference voltage input
3. AGND: Analog ground
4. VIN: Analog input voltage
5. CS: Chip select input
6. SCLK: Serial clock input
7. SDATA: Serial data output
8. DGND: Digital ground
9. DB11-DB0: Data bus pins (12-bit digital output)
10. RD: Read control input
11. WR: Write control input
12. ALE: Address latch enable
13. ADD11-ADD0: Address bus pins
14. INT/EOC: Interrupt/End of Conversion output
15. REFOUT: Reference voltage output
16. CLKOUT: Clock output
17. VSS: Power supply negative terminal

Functional Features

The AD7821KN offers the following functional features:

• High-resolution analog-to-digital conversion
• Fast conversion rate for real-time applications
• Low power consumption for energy efficiency
• Wide input voltage range for versatile signal handling
• Serial interface for easy integration with digital systems

Advantages and Disadvantages

Advantages

• High resolution ensures accurate measurement results.
• Fast conversion rate enables real-time data acquisition.
• Low power consumption reduces energy usage.
• Wide input voltage range accommodates various signal levels.
• Serial interface simplifies integration with digital systems.

Disadvantages

• Limited to 12-bit resolution, which may not be sufficient for certain high-precision applications.
• Requires an external reference voltage source for accurate conversions.

Working Principles

The AD7821KN operates based on the successive approximation register (SAR) architecture. It samples the analog input voltage and performs a series of comparisons to determine the digital representation of the input signal. The conversion process is controlled by the internal clock and control signals.

Detailed Application Field Plans

The AD7821KN can be applied in various fields, including but not limited to:

1. Industrial automation: Used for precise measurement and control in industrial processes.
2. Medical equipment: Enables accurate data acquisition in medical devices.
3. Test and measurement instruments: Provides high-resolution conversion for precise measurements.
4. Data acquisition systems: Used to convert analog signals into digital data for further analysis.
5. Communication systems: Enables analog-to-digital conversion in communication equipment.

Detailed and Complete Alternative Models

1. AD7820: Similar to AD7821KN but with 10-bit resolution.
2. AD7822: Higher-resolution ADC with 14-bit conversion capability.
3. AD7825: Low-power ADC with 12-bit resolution and lower conversion rate.

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

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