Overview
The AD7731BN, manufactured by Analog Devices Inc., is a 24-bit Sigma-Delta Analog-to-Digital Converter (ADC) designed for high-precision data acquisition. This device serves as a complete analog front-end, 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 AD7731BN operates from a single +5 V supply and supports both unipolar and bipolar analog input ranges, making it versatile for various measurement tasks.
Key Specifications
| Parameter | Value | Conditions/Comments |
|---|---|---|
| Number of Bits | 24 | |
| Sampling Rate | Up to 6.4 kHz | |
| Number of Inputs | 3 buffered differential, configurable as 5 pseudo-differential | |
| Input Type | Differential | |
| Data Interface | SPI, DSP compatible | |
| Architecture | Sigma-Delta | |
| Reference Type | External | |
| Voltage - Supply, Analog | +5 V | |
| Voltage - Supply, Digital | +5 V | |
| Package | 24-lead PDIP, SOIC, TSSOP | |
| Operating Temperature | −40°C to +85°C |
Key Features
- 24-bit Sigma-Delta ADC with up to 16 bits peak-to-peak resolution at 800 Hz output rate
- Programmable gain front end for various input signal ranges
- Three buffered differential analog inputs, configurable as five pseudo-differential inputs
- Differential reference input
- Self-calibration and system calibration options
- Low offset drift (< 5 nV/°C) and gain drift (< 2 ppm/°C)
- Fast channel switching with 1 ms settling time
- SPI and DSP compatible serial interface
Applications
The AD7731BN is primarily used in process control applications, such as industrial automation, medical devices, and precision measurement systems. Its high precision and flexibility make it suitable for a wide range of applications requiring accurate analog-to-digital conversion.
Q & A
- What is the resolution of the AD7731BN at an 800 Hz output rate?
The AD7731BN achieves 16 bits peak-to-peak resolution at an 800 Hz output rate.
- What are the available input ranges for the AD7731BN?
The device supports seven unipolar and seven bipolar analog input ranges, from 0 to +20 mV to ±1.28 V.
- What is the operating voltage of the AD7731BN?
The AD7731BN operates from a single +5 V supply for both analog and digital sections.
- What types of packages are available for the AD7731BN?
The AD7731BN is available in 24-lead PDIP, SOIC, and TSSOP packages.
- What is the maximum sampling rate of the AD7731BN?
The maximum sampling rate of the AD7731BN is up to 6.4 kHz).
- Does the AD7731BN support self-calibration?
Yes, the AD7731BN supports both self-calibration and system calibration options).
- What is the settling time for channel switching in the AD7731BN?
The AD7731BN can switch between channels with a settling time of 1 ms).
- Is the AD7731BN compatible with microcontrollers and DSPs?
Yes, the AD7731BN has a serial interface compatible with microcontrollers and digital signal processors).
- What is the operating temperature range of the AD7731BN?
The operating temperature range of the AD7731BN is −40°C to +85°C).
- What are the key advantages of the AD7731BN in terms of drift?
The AD7731BN has a low offset drift of less than 5 nV/°C and a gain drift of less than 2 ppm/°C).
