Overview
The AD7731BNZ, produced by Analog Devices Inc., is a low noise, high throughput 24-bit Sigma-Delta Analog-to-Digital Converter (ADC). This device is designed 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 AD7731 operates from a single +5 V supply and includes self-calibration and system calibration options, ensuring high accuracy and stability over temperature variations.
Key Specifications
| Parameter | Value | Conditions/Comments |
|---|---|---|
| Resolution | 24 bits (16 bits peak-to-peak at 800 Hz output rate) | |
| Output Rate | Up to 6.4 kHz | fCLK IN = 4.9152 MHz |
| Input Ranges | 7 unipolar: 0 to +20 mV, +40 mV, +80 mV, +160 mV, +320 mV, +640 mV, +1.28 V; 7 bipolar: ±20 mV, ±40 mV, ±80 mV, ±160 mV, ±320 mV, ±640 mV, ±1.28 V | |
| Supply Voltage | +5 V | |
| Operating Temperature | −40°C to +85°C | |
| Package | 24-lead PDIP, SOIC, TSSOP | |
| Reference Input Voltage | +2.5 V or +5 V (depending on HIREF bit setting) | |
| Offset Drift | < 5 nV/°C | |
| Gain Drift | < 2 ppm/°C |
Key Features
- 24-bit Sigma-Delta ADC architecture with an analog modulator and a low pass programmable digital filter.
- Programmable gain front end with three buffered differential analog inputs (configurable as five pseudo-differential inputs).
- Differential reference input.
- Self-calibration and system calibration options.
- Serial interface compatible with microcontrollers and digital signal processors, configurable for three-wire operation.
- Low noise and high throughput capabilities.
- Fast channel switching with 1 ms settling time.
Applications
The AD7731BNZ is primarily used in process control applications, such as industrial automation, medical devices, and any system requiring precise analog-to-digital conversion of low-level signals from transducers. Its high accuracy, low noise, and programmable features make it suitable for a wide range of applications where reliable and precise data acquisition is critical.
Q & A
- What is the resolution of the AD7731BNZ ADC?
The AD7731BNZ has a 24-bit resolution, with 16 bits peak-to-peak resolution achievable at an 800 Hz output rate. - What are the input voltage ranges for the AD7731BNZ?
The device supports seven unipolar and seven bipolar input ranges, from 0 to +1.28 V and ±1.28 V respectively. - What is the operating supply voltage of the AD7731BNZ?
The AD7731BNZ operates from a single +5 V supply. - What are the package options for the AD7731BNZ?
The device is available in 24-lead PDIP, SOIC, and TSSOP packages. - Does the AD7731BNZ support self-calibration?
Yes, the AD7731BNZ includes self-calibration and system calibration options. - What is the maximum output rate of the AD7731BNZ?
The maximum output rate is up to 6.4 kHz. - How does the AD7731BNZ handle channel switching?
The device can switch between channels with a settling time of 1 ms. - Is the AD7731BNZ compatible with microcontrollers and digital signal processors?
Yes, the serial interface of the AD7731BNZ is compatible with microcontrollers and digital signal processors and can be configured for three-wire operation. - What are the temperature drift specifications for the AD7731BNZ?
The offset drift is less than 5 nV/°C, and the gain drift is less than 2 ppm/°C. - In what types of applications is the AD7731BNZ typically used?
The AD7731BNZ is typically used in process control applications, industrial automation, and medical devices where precise analog-to-digital conversion is required.
