AD7845JN

Product Overview

Category

AD7845JN belongs to the category of integrated circuits (ICs).

Use

It is commonly used in electronic devices for analog-to-digital conversion.

Characteristics

• AD7845JN is a 12-bit successive approximation register (SAR) ADC.
• It operates on a single power supply voltage ranging from 2.7V to 5.5V.
• The device offers a maximum sampling rate of 200 kilosamples per second (ksps).
• It features an internal reference and a versatile serial interface.

Package

AD7845JN is available in a 28-lead plastic dual in-line package (PDIP).

Essence

The essence of AD7845JN lies in its ability to convert analog signals into digital data with high precision and speed.

Packaging/Quantity

AD7845JN is typically sold in reels, with each reel containing 250 units.

Specifications

• Resolution: 12 bits
• Input Voltage Range: 0V to Vref
• Conversion Time: 3.6 µs (typical)
• Operating Temperature Range: -40°C to +85°C
• Power Supply Voltage Range: 2.7V to 5.5V
• Interface Type: Serial (SPI-compatible)

Detailed Pin Configuration

1. VDD: Power supply voltage
2. VREF: Reference voltage input
3. AGND: Analog ground
4. REFOUT: Reference output
5. DGND: Digital ground
6. DB15-DB0: Data bus (serial interface)
7. CS: Chip select (active low)
8. SCLK: Serial clock input
9. SDATA: Serial data input/output
10. RD: Read control input
11. WR: Write control input
12. A0-A3: Address inputs
13. RESET: Reset input
14. INT/REFIN: Interrupt output/reference voltage input 15-28. NC: No connection

Functional Features

• High-resolution analog-to-digital conversion
• Internal reference voltage for accurate measurements
• Serial interface for easy integration with microcontrollers
• Fast conversion time for real-time applications
• Low power consumption for energy-efficient designs

Advantages and Disadvantages

Advantages

• High precision and accuracy in analog-to-digital conversion
• Versatile serial interface for easy integration
• Wide operating voltage range allows flexibility in power supply selection
• Compact package size for space-constrained applications

Disadvantages

• Limited resolution compared to higher-end ADCs
• Lack of built-in digital filters may require additional external components for noise reduction

Working Principles

AD7845JN utilizes the successive approximation method to convert analog signals into digital data. It samples the input voltage, compares it with a reference voltage, and iteratively adjusts the digital representation until the desired accuracy is achieved.

Detailed Application Field Plans

AD7845JN finds applications in various fields, including: 1. Industrial automation systems 2. Data acquisition systems 3. Medical equipment 4. Instrumentation and measurement devices 5. Audio processing equipment

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to AD7845JN are: 1. AD7887: 12-bit, 8-channel SAR ADC with internal reference and serial interface. 2. MCP3208: 12-bit, 8-channel SAR ADC with SPI interface. 3. MAX1241: 12-bit, single-channel SAR ADC with internal reference and parallel interface.

These alternative models can be considered based on specific application requirements and design constraints.

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