Overview
The AD7731BR-REEL7, manufactured by Analog Devices Inc., is a 24-bit Sigma-Delta Analog-to-Digital Converter (ADC) designed for high-precision data acquisition. This component is part of the AD7731 series and is particularly suited for process control applications. It features a proprietary programmable gain front end, allowing it to accept a wide range of input signal levels directly from transducers. The device operates from a single +5 V supply and supports both unipolar and bipolar analog input ranges. The AD7731BR-REEL7 is packaged in a 24-lead SOIC (Small Outline Integrated Circuit) package, which is conducive to application and heat dissipation in circuit boards.
Key Specifications
| Parameter | Value | Unit | Comments |
|---|---|---|---|
| Number of Bits | 24 | - | - |
| Sampling Rate | 6.4 k | sps | - |
| Number of Inputs | 3, 5 | - | Differential and pseudo-differential inputs |
| Input Type | Differential | - | - |
| Data Interface | SPI, DSP | - | Compatible with microcontrollers and digital signal processors |
| Architecture | Sigma-Delta | - | - |
| Reference Type | External | - | Differential reference input |
| Voltage - Supply, Analog | 5 V | - | - |
| Voltage - Supply, Digital | 5 V | - | - |
| Operating Temperature | -40°C ~ 85°C | - | - |
| Package / Case | 24-SOIC (0.295", 7.50mm Width) | - | - |
Key Features
- Programmable Gain Front End: Allows the device to accept a wide range of input signal levels directly from transducers.
- Sigma-Delta Architecture: Includes an analog modulator and a low pass programmable digital filter, enabling adjustment of filter cutoff, output rate, and settling time.
- High Resolution: Achieves 16 bits peak-to-peak resolution at an 800 Hz output rate and 13 bits at higher output rates.
- Fast Channel Switching: Can switch between channels with a 1 ms settling time.
- Low Drift: Features an offset drift of less than 5 nV/°C and a gain drift of less than 2 ppm/°C.
- Self-Calibration and System Calibration: Includes options for self-calibration and system calibration.
- Serial Interface: Configurable for three-wire operation and compatible with microcontrollers and digital signal processors.
Applications
- Communication: Suitable for various communication systems requiring high-precision analog-to-digital conversion.
- Industrial Control: Ideal for process control applications where precise measurement and conversion of analog signals are critical.
Q & A
- What is the primary function of the AD7731BR-REEL7?
The AD7731BR-REEL7 is a 24-bit Sigma-Delta Analog-to-Digital Converter (ADC) that converts analog signals into digital signals for processing and analysis by digital systems.
- What is the resolution of the AD7731BR-REEL7 at an 800 Hz output rate?
The device achieves 16 bits peak-to-peak resolution at an 800 Hz output rate.
- What types of input signals does the AD7731BR-REEL7 support?
The device supports both unipolar and bipolar analog input ranges, including seven unipolar and seven bipolar ranges.
- What is the operating temperature range of the AD7731BR-REEL7?
The operating temperature range is -40°C to 85°C.
- What is the package type of the AD7731BR-REEL7?
The device is packaged in a 24-lead SOIC (Small Outline Integrated Circuit) package.
- Does the AD7731BR-REEL7 support self-calibration?
Yes, the device includes options for self-calibration and system calibration.
- What is the data interface of the AD7731BR-REEL7?
The device features a serial interface that can be configured for three-wire operation and is compatible with microcontrollers and digital signal processors.
- How many differential inputs does the AD7731BR-REEL7 have?
The device has three buffered differential programmable gain analog inputs, which can also be configured as five pseudo-differential inputs.
- What is the supply voltage for the AD7731BR-REEL7?
The device operates from a single +5 V supply for both analog and digital sections.
- Can the AD7731BR-REEL7 switch between channels quickly?
Yes, the device can switch between channels with a 1 ms settling time.
