AD7703AN

Product Overview

Category

AD7703AN belongs to the category of analog-to-digital converters (ADCs).

Use

The AD7703AN is primarily used for converting analog signals into digital data. It finds applications in various fields where precise and accurate conversion of analog signals is required.

Characteristics

• High-resolution: The AD7703AN offers high-resolution conversion, allowing for accurate representation of analog signals.
• Low power consumption: It operates with low power consumption, making it suitable for battery-powered devices.
• Wide input voltage range: The ADC can handle a wide range of input voltages, enabling it to accommodate different signal levels.
• Serial interface: It features a serial interface for easy integration with microcontrollers or other digital systems.

Package

The AD7703AN comes in a standard 24-pin plastic dual in-line package (PDIP), which ensures ease of installation and compatibility with various circuit boards.

Essence

The essence of the AD7703AN lies in its ability to convert analog signals into digital form accurately and efficiently.

Packaging/Quantity

The AD7703AN is typically packaged in reels or tubes, containing a specific quantity of units per package. The exact packaging and quantity may vary depending on the supplier.

Specifications

• Resolution: 16 bits
• Input voltage range: ±Vref
• Conversion rate: Up to 250 kSPS (samples per second)
• Operating voltage: 2.7V to 5.25V
• Power consumption: 1.5 mW (typical)
• Temperature range: -40°C to +85°C

Detailed Pin Configuration

The AD7703AN has a total of 24 pins, each serving a specific purpose. Here is a detailed pin configuration:

1. VDD: Positive power supply
2. VSS: Ground reference
3. REF IN(+): Positive reference voltage input
4. REF IN(-): Negative reference voltage input
5. AGND: Analog ground
6. AIN1(+) to AIN4(+): Analog input channels
7. AIN1(-) to AIN4(-): Analog input channels
8. DVDD: Digital power supply
9. DGND: Digital ground
10. SCLK: Serial clock input
11. DIN: Serial data input
12. DOUT: Serial data output
13. CS: Chip select input
14. RDY: Ready output
15. RST: Reset input
16. MISO: Master In Slave Out (SPI interface)
17. MOSI: Master Out Slave In (SPI interface)
18. SCK: Serial Clock (SPI interface)
19. SS: Slave Select (SPI interface)
20. VIO: I/O supply voltage
21. VREF OUT: Reference voltage output
22. REFIN COM: Reference input common mode
23. REFIN BUF: Reference input buffer
24. AVDD: Analog power supply

Functional Features

• High-resolution conversion: The AD7703AN offers 16-bit resolution, ensuring accurate representation of analog signals.
• Programmable gain amplifier: It includes a programmable gain amplifier that allows for amplification of weak signals.
• On-chip filtering: The ADC incorporates an on-chip digital filter, reducing noise and enhancing signal quality.
• Flexible serial interface: It features a versatile serial interface that enables easy integration with various microcontrollers or digital systems.

Advantages and Disadvantages

Advantages

• High-resolution conversion ensures precise measurement of analog signals.
• Low power consumption makes it suitable for battery-powered applications.
• Wide input voltage range accommodates different signal levels.
• On-chip filtering reduces noise and enhances signal quality.
• Versatile serial interface allows for easy integration with digital systems.

Disadvantages

• Limited number of analog input channels (4 channels).
• Requires external reference voltage for accurate conversion.

Working Principles

The AD7703AN operates based on the principle of successive approximation. It samples the analog input signal, converts it into a digital value using an internal ADC, and then outputs the digital data through the serial interface. The programmable gain amplifier and on-chip filtering enhance the accuracy and quality of the converted digital data.

Detailed Application Field Plans

The AD7703AN finds applications in various fields, including but not limited to: - Industrial automation: Used for precise measurement and control of analog signals in industrial processes. - Medical devices: Enables accurate conversion of physiological signals for monitoring and diagnosis. - Data acquisition systems: Provides high-resolution analog-to-digital conversion for data logging and analysis. - Instrumentation: Used in scientific instruments for accurate measurement and analysis of analog signals.

Detailed and Complete Alternative Models

• AD7701: Similar to AD7703AN but with 24-bit resolution.
• AD7705: Offers additional features like self-calibration and