Overview
The AD7731BRZ, produced by Analog Devices Inc., is a 24-bit Sigma-Delta Analog-to-Digital Converter (ADC) designed for high-precision data acquisition. This device is 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 AD7731BRZ 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-bit | - |
| Peak-to-Peak Resolution at 800 Hz | 16 bits | - |
| Output Rate | Up to 6.4 kHz | fCLK IN = 4.9152 MHz |
| Input Ranges (Unipolar) | 0 to +20 mV, +40 mV, +80 mV, +160 mV, +320 mV, +640 mV, +1.28 V | - |
| Input Ranges (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 Type | 24-lead SOIC, 24-lead TSSOP, 24-lead plastic DIP | - |
| Settling Time | 1 ms | Between channels |
| 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 allowing for seven unipolar and seven bipolar analog input ranges.
- Three buffered differential programmable gain 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 offset drift and gain drift over temperature.
- Available in 24-lead SOIC, TSSOP, and plastic DIP packages.
Applications
The AD7731BRZ is particularly suited for process control applications, industrial automation, and any environment requiring high-precision analog-to-digital conversion. It is also applicable in medical devices, test and measurement equipment, and other systems that demand accurate and stable analog input processing.
Q & A
- What is the resolution of the AD7731BRZ?
The AD7731BRZ has a 24-bit resolution.
- What are the input ranges supported by the AD7731BRZ?
The device supports seven unipolar and seven bipolar analog input ranges from ±20 mV to ±1.28 V.
- What is the maximum output rate of the AD7731BRZ?
The maximum output rate is up to 6.4 kHz.
- How many channels does the AD7731BRZ support?
The device supports three buffered differential programmable gain analog inputs, which can be configured as five pseudo-differential inputs.
- What is the supply voltage for the AD7731BRZ?
The device operates from a single +5 V supply.
- What are the package options for the AD7731BRZ?
The device is available in 24-lead SOIC, TSSOP, and plastic DIP packages.
- Does the AD7731BRZ support self-calibration?
Yes, the device supports self-calibration and system calibration options.
- What is the settling time between channels for the AD7731BRZ?
The settling time between channels is 1 ms.
- What are the drift specifications for the AD7731BRZ?
The device has an offset drift of less than 5 nV/°C and a gain drift of less than 2 ppm/°C.
- Is the AD7731BRZ compatible with microcontrollers and digital signal processors?
Yes, the serial interface is compatible with microcontrollers and digital signal processors and can be configured for three-wire operation.
