AD7821TQ

Product Overview

Category

AD7821TQ belongs to the category of analog-to-digital converters (ADCs).

Use

The AD7821TQ is used to convert analog signals into digital data for various applications.

Characteristics

• High precision: The AD7821TQ offers high-resolution conversion, ensuring accurate digitization of analog signals.
• Fast conversion rate: This ADC provides a fast conversion rate, enabling real-time data acquisition.
• Low power consumption: The AD7821TQ is designed to operate with low power consumption, making it suitable for battery-powered devices.
• Wide input voltage range: It can handle a wide range of input voltages, allowing flexibility in signal acquisition.
• Small package size: The AD7821TQ comes in a compact package, making it suitable for space-constrained applications.

Package and Quantity

The AD7821TQ is available in a small outline integrated circuit (SOIC) package. It is typically sold in reels containing a specified quantity of units.

Specifications

• Resolution: 12 bits
• Input voltage range: 0V to Vref
• Conversion rate: up to 100 kSPS (samples per second)
• Power supply: 2.7V to 5.5V
• Operating temperature range: -40°C to +85°C

Pin Configuration

The AD7821TQ has a total of 16 pins. The pin configuration is as follows:

1. VDD: Power supply voltage
2. VREF: Reference voltage input
3. AGND: Analog ground
4. REFOUT: Reference voltage output
5. VIN: Analog input voltage
6. D0-D11: Digital output pins
7. CS: Chip select input
8. RD: Read control input
9. WR: Write control input
10. RD/WR: Read/Write control input
11. A0-A3: Address inputs
12. DGND: Digital ground
13. CLK: Clock input
14. INT: Interrupt output
15. NC: No connection
16. VSS: Negative power supply

Functional Features

• High-resolution conversion: The AD7821TQ provides 12-bit resolution, ensuring accurate digitization of analog signals.
• Serial interface: It features a serial interface for easy integration with microcontrollers and other digital devices.
• Internal reference voltage: The ADC includes an internal reference voltage, eliminating the need for an external reference source.
• Low power consumption: The AD7821TQ is designed to operate with low power consumption, making it suitable for battery-powered applications.
• Programmable gain amplifier: It offers a programmable gain amplifier to enhance signal conditioning capabilities.

Advantages and Disadvantages

Advantages

• High precision conversion
• Fast conversion rate
• Low power consumption
• Compact package size
• Wide input voltage range

Disadvantages

• Limited resolution compared to higher-end ADCs
• May require additional external components for specific applications

Working Principles

The AD7821TQ operates based on the successive approximation register (SAR) architecture. It samples the analog input voltage, performs a series of comparisons, and generates a digital output representing the converted value. The internal circuitry ensures accurate and reliable conversion.

Application Field Plans

The AD7821TQ can be used in various applications, including but not limited to: - Data acquisition systems - Industrial automation - Medical equipment - Instrumentation - Communication systems

Alternative Models

• AD7822: Similar specifications with enhanced resolution (14 bits)
• AD7823: Higher-speed version with increased conversion rate
• AD7824: Lower-power variant with reduced power consumption

These alternative models provide options for specific requirements and can be considered as alternatives to the AD7821TQ.

In conclusion, the AD7821TQ is a high-precision analog-to-digital converter with fast conversion rate and low power consumption. Its compact package and wide input voltage range make it suitable for various applications. However, it has limited resolution compared to higher-end ADCs and may require additional external components for specific use cases. The working principle is based on the SAR architecture, ensuring accurate conversion. Alternative models such as the AD7822, AD7823, and AD7824 offer different features to cater to specific needs.