AD7890SQ-2

Product Overview

Category

AD7890SQ-2 belongs to the category of analog-to-digital converters (ADCs).

Use

The AD7890SQ-2 is used to convert analog signals into digital data for processing and analysis in various applications.

Characteristics

• High-resolution: The AD7890SQ-2 offers a resolution of 12 bits, ensuring accurate conversion of analog signals.
• Low power consumption: This ADC operates at low power, making it suitable for battery-powered devices.
• Fast conversion speed: With a maximum conversion rate of 100 kilosamples per second (ksps), the AD7890SQ-2 provides rapid data acquisition.
• Wide input voltage range: It can handle input voltages ranging from 0V to VREF, allowing for versatile signal conversion.
• Small package size: The AD7890SQ-2 comes in a compact package, enabling space-efficient designs.

Package and Quantity

The AD7890SQ-2 is available in a small outline integrated circuit (SOIC) package. It is typically sold in reels containing a quantity of 250 units.

Specifications

• Resolution: 12 bits
• Conversion Rate: Up to 100 ksps
• Input Voltage Range: 0V to VREF
• Power Supply: +5V
• Operating Temperature Range: -40°C to +85°C
• Package Type: SOIC

Pin Configuration

The AD7890SQ-2 has a total of 16 pins. The pin configuration is as follows:

1. VDD: Power supply positive terminal
2. VREF: Reference voltage input
3. AGND: Analog ground
4. VIN: Analog input voltage
5. DOUT: Digital output
6. SCLK: Serial clock input
7. CS: Chip select input
8. DGND: Digital ground
9. NC: No connection
10. NC: No connection
11. NC: No connection
12. NC: No connection
13. NC: No connection
14. NC: No connection
15. NC: No connection
16. VSS: Power supply negative terminal

Functional Features

• Serial Interface: The AD7890SQ-2 utilizes a serial interface for communication with microcontrollers or other digital devices.
• Internal Reference: It incorporates an internal reference voltage, simplifying the design and calibration process.
• Programmable Gain Amplifier (PGA): The ADC includes a PGA that allows for signal amplification before conversion, enhancing sensitivity.
• Low Noise Performance: The AD7890SQ-2 exhibits low noise characteristics, ensuring accurate conversion even in noisy environments.

Advantages and Disadvantages

Advantages

• High resolution for precise analog-to-digital conversion.
• Low power consumption, suitable for battery-powered applications.
• Fast conversion speed enables rapid data acquisition.
• Wide input voltage range accommodates various signal levels.
• Compact package size for space-efficient designs.

Disadvantages

• Limited to 12-bit resolution, which may not be sufficient for certain high-precision applications.
• Requires an external reference voltage if the internal reference is not suitable for the application.

Working Principles

The AD7890SQ-2 operates based on the successive approximation register (SAR) architecture. It samples the analog input voltage and compares it to a reference voltage using a binary search algorithm. The conversion process involves a series of comparisons and adjustments until the digital output accurately represents the analog input.

Detailed Application Field Plans

The AD7890SQ-2 finds applications in various fields, including: 1. Industrial automation: Used for monitoring and control systems in manufacturing processes. 2. Medical equipment: Enables precise measurement and analysis of physiological signals. 3. Test and measurement instruments: Provides accurate data acquisition for scientific and engineering purposes. 4. Communication systems: Used in signal processing and modulation/demodulation applications. 5. Automotive electronics: Enables sensor data conversion for vehicle control systems.

Alternative Models

1. AD7890AR-2: Similar to the AD7890SQ-2 but comes in a different package (SSOP).
2. AD7890BR-2: Offers improved temperature range (-40°C to +125°C) compared to the AD7890SQ-2.
3. AD7890CR-2: Provides higher resolution (14 bits) for enhanced precision.

These alternative models offer similar functionality with slight variations in specifications, package type, or additional features.

In conclusion, the AD7890SQ-2 is a high-resolution analog-to-digital converter with low power consumption and fast conversion speed. Its compact size and wide input voltage range make it suitable for various applications. While it has some limitations, such as limited resolution, it offers advantages like internal reference and programmable gain amplification. The ADC operates based on the SAR architecture and finds applications in industrial automation, medical equipment