AD7868AR

Product Overview

Category: Analog-to-Digital Converter (ADC)

Use: The AD7868AR is a high-performance, 12-bit successive approximation register (SAR) ADC. It is designed to convert analog signals into digital data with high accuracy and speed.

Characteristics: - Resolution: 12 bits - Sampling Rate: Up to 1 MSPS (Mega Samples Per Second) - Input Voltage Range: ±10V - Power Supply: +5V - Interface: Serial Peripheral Interface (SPI) - Package Type: 24-Lead SOIC (Small Outline Integrated Circuit) - Essence: The AD7868AR provides precise and reliable conversion of analog signals into digital format, making it suitable for various applications.

Packaging/Quantity: The AD7868AR is available in a 24-Lead SOIC package. It is typically sold in reels of 250 units.

Specifications

• Resolution: 12 bits
• Conversion Time: 1 µs (typical)
• Input Voltage Range: ±10V
• Differential Nonlinearity (DNL): ±0.5 LSB (Least Significant Bit)
• Integral Nonlinearity (INL): ±1 LSB
• Operating Temperature Range: -40°C to +85°C
• Power Supply Voltage: +5V ±5%
• Power Consumption: 3.5 mW (typical)

Pin Configuration

The AD7868AR has a total of 24 pins. The pin configuration is as follows:

Pin 1: VREF- Pin 2: VREF+ Pin 3: AGND Pin 4: DVDD Pin 5: DOUT Pin 6: SCLK Pin 7: CS Pin 8: DIN Pin 9: DGND Pin 10: VDD Pin 11: VIN- Pin 12: VIN+ Pin 13: REFOUT Pin 14: REFIN Pin 15: CLK Pin 16: D1 Pin 17: D2 Pin 18: D3 Pin 19: D4 Pin 20: D5 Pin 21: D6 Pin 22: D7 Pin 23: D8 Pin 24: D9

Functional Features

• High-resolution conversion: The AD7868AR offers a 12-bit resolution, providing accurate digital representation of analog signals.
• Fast sampling rate: With a maximum sampling rate of 1 MSPS, it can capture and convert analog signals quickly.
• Low power consumption: The ADC consumes only 3.5 mW of power, making it suitable for low-power applications.
• Serial interface: It utilizes the SPI interface for easy integration with microcontrollers and other digital devices.

Advantages and Disadvantages

Advantages: - High accuracy and precision in converting analog signals to digital format. - Fast conversion speed enables real-time data acquisition. - Low power consumption makes it suitable for battery-powered devices. - Compact package size allows for space-efficient designs.

Disadvantages: - Limited resolution compared to higher-end ADCs. - Requires an external reference voltage for accurate conversions. - May introduce noise and distortion during the conversion process.

Working Principles

The AD7868AR uses the successive approximation technique to convert analog signals into digital data. It samples the input voltage and compares it to a reference voltage using a binary search algorithm. By iteratively adjusting the digital code, it converges to the closest digital representation of the analog signal.

Detailed Application Field Plans

The AD7868AR is widely used in various applications that require high-precision analog-to-digital conversion. Some of the common application fields include:

1. Industrial Automation: The ADC is used in process control systems, data acquisition, and monitoring applications.
2. Medical Instruments: It finds application in medical devices such as patient monitoring systems, electrocardiographs, and blood pressure monitors.
3. Test and Measurement Equipment: The ADC is utilized in oscilloscopes, spectrum analyzers, and other test instruments for accurate signal analysis.
4. Communication Systems: It is employed in wireless communication systems, base stations, and satellite communication equipment for signal processing.

Detailed and Complete Alternative Models

• AD7868BRZ: Similar to AD7868AR but available in a 24-Lead TSSOP package.
• AD7868BNZ: Similar to AD7868AR but available in a 24-Lead PDIP package.
• AD7868BRUZ: Similar to AD7868AR but available in a 24-Lead SOIC package with an extended temperature range.

These alternative models provide similar functionality and performance characteristics as the AD7868AR but offer different package options to suit specific design requirements.

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